Color management method, color management device, computer program product, image forming device, and reading device

Abstract

A color management method, a color management apparatus, a computer program product, an image forming apparatus, and a reading apparatus perform color management in combination with a balance between a required quality and a delivery period. The color management device performs color management related to the image forming engine on paper printed by the image forming engine according to data read by a reading device arranged on a conveying path of the paper. The reading device is provided with a color photometer and a scanner. The color management device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern. The first pattern is a pattern in which the color photometer moves a first width in the width direction of the paper and reads all or some of the plurality of color patches arranged in the width direction of the paper. The second pattern is a pattern in which the color photometer stops or moves by a second width smaller than the first width in the width direction of the paper and the scanner reads all or some of the plurality of color patches arranged in the width direction of the paper.

Description

Technical Field

[0001] This invention relates to a color management method, a color management device, a computer program product, an image forming apparatus, and a reading device. Background Technology

[0002] An image forming apparatus utilizes an inline reader (installed in the paper transport path) to read paper printed with color charts for color management. In such an apparatus, a series of processes, including color chart printing, color chart measurement, and color management based on the measurement data, can be automated. For example, a series of processes can be executed through pre-defined operations performed by the user. Therefore, even operators with limited knowledge or experience can manage the color of the image forming apparatus for tasks such as color verification and color correction, which are referred to as "color matching."

[0003] In recent years, online reading devices have utilized both a scanner (such as a linear CCD sensor) and an optical colorimeter capable of moving in the paper width direction (CD direction) orthogonal to the paper transport direction (see Patent Document 1). While scanners offer fast reading speeds, they require calculating colorimetric values ​​(L...) based on the read data (RGB values). * a * b * Colorimeters measure color values ​​(such as XYZ values), so their accuracy is lower compared to optical colorimeters. On the other hand, while colorimeters offer high accuracy, their reading speed is slow because they require the meter to move across the width of the paper while reading. Therefore, operators must coordinate with customer requests related to color matching to operate the scanner and colorimeter.

[0004] Existing technical documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2024-85279 Summary of the Invention

[0006] Generally, print shops commissioned by customers are required to provide high-quality printed materials within a short delivery time. However, quality and delivery time are inversely related, making it difficult to simultaneously ensure both high quality and short delivery time. Therefore, when accepting an order, it is necessary to inquire about the customer's requirements for quality and delivery time, and to balance these factors when selecting colors.

[0007] Online colorimeters were originally designed to automate the color matching process and enable operators with limited knowledge or experience to manage colors efficiently. However, operators with limited knowledge or experience often struggle to balance the quality and delivery time requirements demanded by customers when operating scanners and colorimeters.

[0008] The present invention was made in view of the problems in the prior art described above. The subject is to perform color management in a way that balances the required quality and delivery time.

[0009] To address the aforementioned issues, technical solution 1 describes a color management method, wherein a color management device switches between a mode for acquiring data based on a first pattern and a mode for acquiring data based on a second pattern. The color management device performs color management related to the image forming engine based on data read by a reading device equipped with a colorimeter and a scanner, which is installed in the paper transport path. The first pattern is a pattern for which the colorimeter moves a first width in the paper width direction and reads all or a portion of the color blocks arranged in the paper width direction. The second pattern is a pattern for which the colorimeter stops or moves a second width smaller than the first width in the paper width direction and the scanner reads all or a portion of the color blocks arranged in the paper width direction.

[0010] In the color management method described in technical solution 1, the invention described in technical solution 2 involves the color management device switching between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern in a process related to the color management.

[0011] In the color management method described in technical solution 2, the invention described in technical solution 3 involves the color management device switching between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern, according to a ratio determined based on settings received from the user.

[0012] In the color management method described in technical solution 2, the invention described in technical solution 4 obtains data based on a first pattern for a first region in a piece of paper, and obtains data based on a second pattern for a second region in the same piece of paper that is different from the first region.

[0013] In the color management method described in technical solution 2, the image forming engine prints color blocks onto multiple sheets of paper, and the color management device obtains data based on a first pattern for a first sheet of the multiple sheets, and obtains data based on a second pattern for a second sheet of the multiple sheets that is different from the first sheet.

[0014] In the color management method described in technical solution 1, the invention described in technical solution 6 does not acquire data read by the scanner regarding the first pattern.

[0015] In the color management method described in technical solution 1, the invention described in technical solution 7 does not obtain data read by the colorimeter regarding the second pattern.

[0016] In the color management method described in technical solution 1, the invention described in technical solution 8 involves the colorimeter stopping in the paper width direction during the reading of the second pattern.

[0017] In the color management method described in technical solution 1, the invention described in technical solution 9 obtains data from a portion of color blocks among a plurality of color blocks arranged in the width direction of the paper, as described in technical solution 1, and obtains data from other color blocks among the plurality of color blocks arranged in the width direction of the paper, other than the portion of color blocks read by the color meter, as described in technical solution 1.

[0018] In the color management method described in technical solution 10, the color management device, with respect to the second pattern, obtains data obtained by the scanner reading a portion of the color blocks arranged in the width direction of the paper, and obtains data obtained by the colorimeter reading other color blocks in the multiple color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the scanner.

[0019] In the color management method described in technical solution 1, the reading device corrects the data read by the scanner based on the data read by the colorimeter for the second pattern.

[0020] In the color management method described in technical solution 12, the color management device performs color management based on a color management dataset. The color management device accepts the setting of the color management dataset, obtains the setting of a mode corresponding to the set color management dataset, and obtains data in the mode represented by the obtained mode setting.

[0021] In the color management method described in technical solution 12, the color management dataset includes the setting of the mode, and the color management device acquires data according to the mode represented by the setting of the mode included in the color management dataset.

[0022] In the color management method described in technical solution 14, the color management is at least one of color verification, color profile creation, and color correction.

[0023] The invention described in technical solution 15 is a color management device, comprising a control unit that executes any one of the color management methods described in technical solutions 1 to 14.

[0024] The invention described in technical solution 16 is a computer program product used to cause a computer controlling a color management device to execute any one of the color management methods described in technical solutions 1 to 14.

[0025] The invention described in technical solution 17 is an image forming apparatus, wherein the image forming apparatus includes an image forming engine, and the image forming apparatus is capable of cooperating with a reading device equipped with a colorimeter and a scanner, which is installed in the transport path of the paper printed by the image forming engine. The image forming engine switches between a first pattern and a second pattern for printing. The first pattern is a pattern for which the colorimeter moves a first width in the width direction of the paper and reads all or a portion of the color blocks arranged in the width direction of the paper to obtain data. The second pattern is a pattern for which the colorimeter stops or moves a second width smaller than the first width in the width direction of the paper and the scanner reads all or a portion of the color blocks arranged in the width direction of the paper to obtain data.

[0026] In the image forming apparatus described in technical solution 17, the image forming engine switches between a mode for printing the first pattern and a mode for printing the second pattern in a process related to the color management of the image forming apparatus.

[0027] In the image forming apparatus described in technical solution 18, the image forming engine switches between the mode of printing the first pattern and the mode of printing the second pattern according to a ratio determined based on settings received by the user.

[0028] The invention described in technical solution 20, in the image forming apparatus described in technical solution 18, wherein the image forming engine prints the first pattern with respect to a first region in a piece of paper, and prints the second pattern with respect to a second region in the piece of paper that is different from the first region.

[0029] The invention described in technical solution 21, in the image forming apparatus described in technical solution 18, wherein the image forming engine prints color blocks onto a plurality of papers, the image forming engine prints the first pattern on a first paper among the plurality of papers, and prints the second pattern on a second paper among the plurality of papers that is different from the first paper.

[0030] In the image forming apparatus described in technical solution 17, the invention described in technical solution 22 does not print the area read by the scanner as the first pattern in the image forming engine.

[0031] In the image forming apparatus described in technical solution 17, the invention described in technical solution 23 does not print the area read by the colorimeter as the second pattern in the image forming engine.

[0032] The invention described in technical solution 24 is a reading device disposed on the paper transport path of an image forming engine and comprising a colorimeter and a scanner. The reading device switches between a mode for acquiring data based on a first pattern and a mode for acquiring data based on a second pattern. The first pattern is a pattern for the colorimeter to move a first width in the paper width direction and for the colorimeter to read all or a portion of the color blocks arranged in the paper width direction. The second pattern is a pattern for the colorimeter to stop or move a second width smaller than the first width in the paper width direction and for the scanner to read all or a portion of the color blocks arranged in the paper width direction.

[0033] The invention described in technical solution 25, in the reading device described in technical solution 24, wherein the reading device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern in a process related to color management.

[0034] The invention described in technical solution 26, in the reading device described in technical solution 25, wherein the reading device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern, according to a ratio determined based on a setting received from the user.

[0035] The invention described in technical solution 27, in the reading device described in technical solution 25, acquires data based on a first pattern for a first region in a piece of paper, and acquires data based on a second pattern for a second region in the same piece of paper that is different from the first region.

[0036] The invention described in technical solution 28, in the reading device described in technical solution 25, obtains data based on a first pattern for a first paper among a plurality of papers printed with color blocks, and obtains data based on a second pattern for a second paper among the plurality of papers that is different from the first paper.

[0037] In the reading device described in technical solution 24, the invention described in technical solution 29 does not acquire data read by the scanner regarding the first pattern.

[0038] In the reading device described in technical solution 24, the invention described in technical solution 30 does not acquire data read by the colorimeter regarding the second pattern.

[0039] In the reading device described in technical solution 24, the colorimeter stops in the paper width direction during the reading of the second pattern, according to the invention described in technical solution 31.

[0040] In the reading device described in technical solution 24, the invention described in technical solution 32 acquires data obtained by the colorimeter reading a portion of the color blocks arranged in the width direction of the paper, and acquires data obtained by the scanner reading other color blocks in the multiple color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the colorimeter, regarding the first pattern.

[0041] In the reading device described in technical solution 24, the invention described in technical solution 33 acquires data about the second pattern obtained by the scanner reading a portion of the color blocks arranged in the width direction of the paper, and acquires data obtained by the colorimeter reading other color blocks in the multiple color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the scanner.

[0042] The invention described in technical solution 34 is a reading device described in technical solution 24, wherein the reading device corrects the data read by the scanner based on the data read by the colorimeter with respect to the second pattern.

[0043] According to the present invention, color management can be carried out by combining the required balance between quality and delivery time. Attached Figure Description

[0044] Figure 1 This is a structural diagram of the color management system in the first embodiment of the present invention.

[0045] Figure 2 This is a diagram showing the hardware structure of an image forming apparatus.

[0046] Figure 3 This is a diagram showing the hardware structure of the reading device.

[0047] Figure 4 This is a diagram showing the external structure of the image forming apparatus and the reading apparatus.

[0048] Figure 5 This is a diagram that schematically shows the positional relationship between the online reading unit and the color table.

[0049] Figure 6 This is a diagram showing the hardware structure of a PC.

[0050] Figure 7 This is a diagram showing the hardware structure of the printer controller.

[0051] Figure 8 This is a diagram showing the hardware structure of the color management device.

[0052] Figure 9 This is a diagram illustrating an example of the data structure of a printer information table.

[0053] Figure 10 This is a diagram illustrating an example of the data structure of a dataset table used for color management.

[0054] Figure 11 This is an example of a color chart composed of Pattern A.

[0055] Figure 12 This is an example of a color chart composed of pattern B.

[0056] Figure 13 This is an example of a color chart composed of pattern C.

[0057] Figure 14 This is an example of a color chart composed of pattern D.

[0058] Figure 15 This is an example of a color chart composed of pattern E.

[0059] Figure 16 It is a diagram used to illustrate the spot color measurement of a colorimeter.

[0060] Figure 17 It is a diagram used to illustrate the line color measurement of a colorimeter.

[0061] Figure 18 This is a flowchart illustrating the execution process of the first color management.

[0062] Figure 19 It is a diagram showing the data structure of paper printing settings.

[0063] Figure 20 This is an example of a color measurement settings screen.

[0064] Figure 21 This is a flowchart illustrating the execution process of the second color management in the second embodiment.

[0065] Figure 22 This is an example of a selection screen for a dataset used in color management.

[0066] Figure 23 This is an example of a color table that includes both precision-priority and speed-priority patterns on the same page.

[0067] Figure 24This is an example of a color table consisting of multiple pages that includes both precision-priority and speed-priority patterns.

[0068] Figure 25 This is an example of a situation where the switch between precision-priority patterns and speed-priority patterns in a color table consisting of multiple pages is located on the same page.

[0069] Figure 26 This is an example of a colorimetric settings screen where the ratio of precision-priority patterns to speed-priority patterns can be set.

[0070] Figure 27 This is an example of a color measurement setting screen that allows you to set the patterns and proportions you can use.

[0071] Figure 28 This is an example of the priority of each color block. Detailed Implementation

[0072] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The advantages and features provided by these embodiments will be understood from the following detailed description and the accompanying drawings. However, the scope of the present invention is not limited to the embodiments disclosed below or the examples in the drawings.

[0073] [First Implementation]

[0074] Figure 1 The structure of the color management system 100 in the first embodiment is shown. The color management system 100 includes a PC (Personal Computer) 10, a printer controller 20, multiple image forming apparatuses 30, a reading device 40 corresponding to each image forming apparatus 30, and a color management device 50. The devices constituting the color management system 100 are connected via a communication network N such as a LAN (Local Area Network) to enable data communication. Furthermore, the number of each device is not particularly limited. For example, the color management system 100 can be used in a printing shop that provides printed materials to customers.

[0075] Alternatively, each image forming apparatus 30 can be connected to a corresponding reading device 40 via a dedicated line. In this case, data communication between the reading device 40 and other devices is performed via the image forming apparatus 30.

[0076] PC10 has printer driver program 121 installed (see reference) Figure 6The PC 10 issues printing instructions to the printer controller 20 or the image forming apparatus 30 via the printer driver. Specifically, the PC 10 generates printing data described in Page Description Language (PDL) or similar language that the printer controller 20 can interpret, based on the user's operation. Alternatively, the PC 10 can also issue printing instructions to the printer controller 20 or the image forming apparatus 30 using specific applications, such as data related to PDFs, without using the printer driver.

[0077] Printer controller 20 has printer controller program 221 installed (see reference). Figure 7 The printer controller 20 receives printing data from the PC 10. Additionally, the printer controller 20 receives color chart data from the color management device 50. The printer controller 20 performs RIP (Raster Image Processing) processing on the printing data or color chart data to generate image data (raster data) for printing. Furthermore, the printer controller 20 performs image processing such as color transformation and filtering on the image data for printing. The printer controller 20 sends the image data (raster data) after image processing to the image forming apparatus 30.

[0078] Furthermore, the printer controller 20 can also be built into the image forming apparatus 30. Additionally, the printer controller 20 and the image forming apparatus 30 can be connected via a dedicated cable such as a PCI connector.

[0079] The image forming apparatus 30 forms an image on paper based on raster data (image data in bitmap form) received from the printer controller 20. Paper includes printing paper and various films. Types of paper include plain paper, high-grade paper, glossy coated paper, matte coated paper, etc.

[0080] The reading device 40 is connected downstream of the image forming apparatus 30 in the paper conveying direction. The reading device 40 reads the paper printed by the image forming apparatus 30.

[0081] The color management device 50 is equipped with a color management application 521 (see reference) for performing color management of the image forming device 30. Figure 8 The color management device 50 performs color verification, color profile creation, color correction, and history management in the image forming device 30.

[0082] Figure 2 The hardware structure of the image forming apparatus 30 is shown. Figure 3 The hardware structure of the reading device 40 is shown. Figure 4The external structure of the image forming apparatus 30 and the reading device 40 is shown. In addition to the four toners of cyan (C), magenta (M), yellow (Y) and black (K), the image forming apparatus 30 can also form images using white (W) as a special color toner.

[0083] like Figure 2 As shown, the image forming apparatus 30 includes a CPU (Central Processing Unit) 31, a storage unit 32, a display unit 33, an operation unit 34, a communication unit 35, an image forming unit 36, a document reading unit 37, and a paper feeding unit 38.

[0084] The CPU 31 controls the overall processing operations of each part of the image forming apparatus 30. The CPU 31 reads various processing programs stored in the storage unit 32 and performs various processing operations in cooperation with the programs.

[0085] The storage unit 32 includes HDD (Hard Disk Drive), SSD (Solid State Drive), non-volatile memory, etc. The storage unit 32 stores various processing programs and data related to these processes. For example, the storage unit 32 stores paper information related to the image forming apparatus 30. Additionally, the storage unit 32 stores target configuration files, printer configuration files, scanner configuration files, etc.

[0086] The display unit 33 is composed of an LCD (Liquid Crystal Display). The display unit 33 displays various images according to the display signals input from the CPU 31.

[0087] The operation unit 34 receives various operations performed by the user and outputs operation signals based on those operations to the CPU 31. The operation unit 34 includes a touch screen, numeric keys, a start button, a stop button, etc.

[0088] The communication unit 35 performs data communication with external devices. For example, the communication unit 35 receives raster data from the printer controller 20. The communication unit 35 receives printing instructions for color charts from the color management device 50, etc.

[0089] The image forming unit 36 ​​forms an image onto the paper using an electrophotographic method. For example... Figure 4As shown, the image forming unit 36 ​​includes photosensitive drums 361C, 361M, 361Y, 361K, and 361W corresponding to each of the colors cyan (C), magenta (M), yellow (Y), black (K), and white (W), an intermediate transfer belt 362, a fixing unit 363, and a flipping unit 364. For example, after uniformly charging the photosensitive drum 361C corresponding to cyan, the image forming unit 36 ​​scans and exposes the photosensitive drum 361C using a laser beam based on the cyan image data, forming an electrostatic latent image. The image forming unit 36 ​​then attaches cyan toner to the electrostatic latent image on the photosensitive drum 361C and develops it. The processing for other colors is the same as for cyan. The image forming unit 36 ​​sequentially transfers the toner images of each color formed on the photosensitive drums 361C, 361M, 361Y, 361K, and 361W corresponding to each color onto the intermediate transfer belt 362 (one-time transfer). That is, a color toner image formed by overlapping multiple colors of toner images is formed on the intermediate transfer belt 362. The image forming unit 36 ​​transfers the color toner image on the intermediate transfer belt 362 onto the paper in one step (secondary transfer). The fixing unit 363 fixes the color toner image onto the paper by heating and pressurizing. When images are formed on both sides of the paper, the flipping unit 364 flips the paper after the surface image has been fixed and then transports it back to the image forming unit 36. The CPU 31 controls the image forming unit 36 ​​to form an image based on the grid data received from the printer controller 20.

[0090] In addition, Figure 4 The image shows an example of an image forming unit 36 ​​that uses five colors (CMYKW) – cyan, magenta, yellow, black, and white – to form an image. Alternatively, the toner used in the image forming unit 36 ​​may not contain white, or it may contain special colors other than white.

[0091] The original document reading unit 37 reads the paper, color samples, etc. placed on the original document table and generates reading data with pixel values ​​of each color, namely red (R), green (G), and blue (B).

[0092] The paper supply unit 38 has multiple paper supply trays, which supply the paper stored in each paper supply tray to the image forming unit 36.

[0093] like Figure 3 As shown, the reading device 40 includes a CPU 41, a storage unit 42, a communication unit 43, and an online reading unit 44.

[0094] The CPU 41 controls the overall processing operations of each part of the reading device 40. The CPU 41 reads various processing programs stored in the storage unit 42 and performs various processing operations in cooperation with the programs.

[0095] Storage unit 42 includes HDD, SSD, non-volatile memory, etc. Storage unit 42 stores various processing programs, data related to various processing, etc.

[0096] The communication unit 43 performs data communication with external devices. For example, the communication unit 43 receives color chart reading instructions from the color management device 50. The communication unit 43 sends reading data from the online reading unit 44 to the color management device 50.

[0097] The online reading unit 44 is disposed on a transport path downstream of the image forming unit 36 ​​(image forming engine) in the paper transport direction. The online reading unit 44 reads the image formed on the paper and generates reading data. The online reading unit 44 includes a colorimeter 45 and a scanner 46.

[0098] Figure 5 The positional relationship between the online reading unit 44 and the color chart 200 is schematically shown. By moving the color chart 200, the online reading unit 44 can read different positions on the color chart 200 in the paper transport direction.

[0099] The colorimeter 45 is a spectral colorimeter, measuring the absolute value of color (L). * a * b * The colorimeter 45 accurately measures color (values, XYZ values, etc.). For an image formed on paper (color chart 200), the colorimeter 45 measures the color of the image by detecting the spectral reflectance at each wavelength. The readings performed by the colorimeter 45 include a dot colorimeter mode and a line colorimeter mode.

[0100] Spot color measurement mode is a mode in which each color patch is measured individually once. For the camera, spot color measurement mode means that the shutter button is pressed once for each color patch. That is, in spot color measurement mode, the colorimeter 45 reads a portion of the area along the paper width direction (main scanning direction) orthogonal to the paper feed direction in a single reading (measurement).

[0101] Linear colorimetry mode is a mode that obtains time-series data of colorimetric values ​​by continuously reading them while the colorimeter 45 is moving. For the camera, linear colorimetry mode involves moving the camera while the shutter is open to capture the image. In linear colorimetry mode, the colorimeter 45 can also output the average value of the colorimetric values ​​obtained within the same color patch as the reading data corresponding to that color patch.

[0102] The colorimeter 45 is configured to move along the width of the paper. By moving along the width of the paper, the colorimeter 45 can read the entire width of the paper. In other words, when the colorimeter 45 is not moved, it can only read a portion of the area along the width of the paper. Additionally, the colorimeter 45 is also used for the calibration of the scanner 46.

[0103] The scanner 46 is fixed in place and can read the entire width direction of the paper in a single read. The scanner 46 reads the fed paper (color chart 200) and generates readout data with pixel values ​​for each color: red (R), green (G), and blue (B). The scanner 46 is, for example, a linear CCD sensor. During the readout performed by the scanner 46, the CPU 31 calculates the colorimetric value (L) based on the RGB values. * a * b * Values, XYZ values, etc.

[0104] The patterns (color charts) read by the online reading unit 44 include pattern 1 and pattern 2.

[0105] The first pattern is used when the colorimeter 45 moves a first width along the width of the paper, and the colorimeter 45 reads all or a portion of the multiple color patches arranged along the width of the paper. The first pattern is primarily read by the colorimeter 45, hence it is called the "precision-priority pattern." Compared to reading based on the second pattern, reading based on the precision-priority pattern offers higher accuracy but is slower. In reading based on the precision-priority pattern, for example, by reading approximately 1700 color patches printed across the entire surface of the paper using the colorimeter 45 and performing color adjustments, high-precision color management is possible.

[0106] The second pattern is a pattern used by the colorimeter 45 to stop or move a second width smaller than the first width in the paper width direction, and for the scanner 46 to read all or a portion of the multiple color patches arranged in the paper width direction. The second pattern is primarily read by the scanner 46, hence it is called a "speed-priority pattern." Compared to reading based on a precision-priority pattern, reading based on a speed-priority pattern is faster, but the accuracy of the color measurement values ​​is lower.

[0107] Furthermore, precision-priority patterns and speed-priority patterns are relative concepts. Depending on the patterns being compared, the same pattern can be either a precision-priority pattern or a speed-priority pattern.

[0108] Figure 6 The hardware structure of PC10 is shown. PC10 includes CPU11, storage unit 12, display unit 13, operation unit 14, and communication unit 15.

[0109] CPU11 controls the overall processing operations of various parts of PC10. CPU11 reads various processing programs stored in storage unit 12 and performs various processing operations in cooperation with these programs.

[0110] Storage unit 12 includes HDD, SSD, non-volatile memory, etc. Storage unit 12 stores various processing programs such as printer driver program 121, and data related to various processing.

[0111] The display unit 13 is composed of an LCD. The display unit 13 displays various images according to the display signals input from the CPU 11.

[0112] The operation unit 14 includes a keyboard and a mouse as indicator devices. The operation unit 14 outputs operation signals input through key operations on the keyboard and operations on the indicator devices to the CPU 11.

[0113] The communications unit 15 conducts data communication with external devices.

[0114] Figure 7 The hardware structure of the printer controller 20 is shown. The printer controller 20 includes a CPU 21, a storage unit 22, a display unit 23, an operation unit 24, and a communication unit 25. Since the components in the printer controller 20 are the same as those in the PC 10, the parts that differ from the PC 10 will be described.

[0115] The storage unit 22 stores the printer controller program 221. Additionally, the storage unit 22 stores the target configuration file, printer configuration file, etc.

[0116] Figure 8 The hardware structure of the color management device 50 is shown. The color management device 50 includes a CPU 51, a storage unit 52, a display unit 53, an operation unit 54, and a communication unit 55. The components in the color management device 50 are the same as those in the PC 10, so the parts that are different from the PC 10 will be described.

[0117] The storage unit 52 stores a color management application 521. The color management application is implemented through the collaboration of the CPU 51 and the color management application 521. The color management application provides a user interface for executing instructions for color management of the image forming apparatus 30, confirming color verification results, calculating correction values, etc. Furthermore, the method of using the color management application is not limited to installing the program locally. Instead, it can also be used as a SaaS (Software as a Service) service, accessing the color management application in the cloud via a browser from the color management device 50.

[0118] The storage unit 52 stores a printer information table T1 and a color management dataset table T2.

[0119] Printer information form T1 is a form used to manage printer information of multiple image forming devices 30 within the color management system 100.

[0120] Figure 9 The data structure of printer information table T1 is shown as an example. In printer information table T1, for each image forming device 30, there are corresponding information such as printer name, model name, serial number, IP address, main administrator password, status, setting location, communication settings, authentication settings, and paper information.

[0121] "Printer name" is the name of the image forming apparatus 30 (printer).

[0122] "Model name" is the model name of the image forming apparatus 30.

[0123] The “serial number” is the serial number of the image forming apparatus 30.

[0124] "IP address" refers to the IP address of the image forming apparatus 30. It can also be the IP address of the image forming engine (image forming apparatus 30) and the individual IP addresses of the printer controller 20.

[0125] The “main manager password” is the manager password of the image forming apparatus 30.

[0126] "Status" is information indicating the state of the image forming apparatus 30. "Status" can be online or offline.

[0127] "Setting location" refers to the setting location of the image forming apparatus 30.

[0128] "Communication settings" refers to information indicating the communication settings of the image forming apparatus 30. The "Communication settings" include SSL (ON / OFF), SSL port, and RAW printing port.

[0129] "Authentication settings" refers to the authentication settings of the image forming apparatus 30. The "Authentication settings" include authentication (on / off) and public user (on / off).

[0130] "Paper information" refers to information related to the paper used in the image forming apparatus 30. "Paper information" includes information such as the type of paper and which feed tray the paper enters. This "paper information" includes the feed tray, paper profile, paper size, paper feed direction, paper type, paper weight, paper color, and perforations.

[0131] Color management dataset table T2 is a table used to manage the color management dataset (target configuration, color management target settings) used in the color management device 50 (color management application). The color management dataset includes settings for the colorimeter used in color management, settings for the color chart used, tolerance values ​​for color verification, settings for color correction, and settings for data acquisition modes. It also includes various settings required for color measurement processing.

[0132] Figure 10 The data structure of the color management dataset table T2 is shown as an example. In the color management dataset table T2, for each color management dataset, there are corresponding associations such as color management dataset name, color measurement settings, configuration file creation settings, color verification settings, and data acquisition mode.

[0133] "Color Management Dataset Name" is the name of the color management dataset.

[0134] "Color Measurement Settings" are settings related to color measurement. These include the colorimeter used, measurement conditions, and the number of measurement averaging cycles.

[0135] When obtaining colorimetric values, considering stability during printing, multiple copies of the control strip or color chart are printed, and the colorimetric values ​​are averaged for each color patch. "Number of colorimetric averagings" refers to the number of copies of the control strip or color chart used in this averaging process. The "Number of colorimetric averagings" is a user-specified value.

[0136] "Profile Creation Settings" are settings related to the creation of profiles. These include settings for characteristic color tables, UCR / GCR, and Device Link Profile (DLP) creation.

[0137] "Specified color table" is a color table used in the creation (characterization) of configuration files.

[0138] "UCR (Under Color Removal)" replaces the CMY in shadow areas with a black background (K). "GCR (Gray Component Replacement)" replaces highlights with shadows, essentially replacing all grayscale CMY with a black background (K).

[0139] The “DLP Production Settings” include RGB-CMYK DLP (RGB source profile, RGB rendering intent) and CMYK-CMYK DLP (target profile, CMYK rendering intent, intermediate turbidity removal, and pure color preservation).

[0140] "Intermediate turbidity removal" is a setting that reproduces colors that were composed of only a single color before the color change in a way that they are also composed of only that color after the color change.

[0141] "Solid color preservation" is a setting that reproduces the pure color portion before the color change as the pure color of the original color after the color change.

[0142] "Color Verification Settings" are settings related to color verification. The "Color Verification Settings" include the standard name for color verification, color verification control bars, calculation settings, judgment items, and allowable values.

[0143] The “Calculation Settings” include basis considerations (absolute / relative) and dE calculation formulas (dE00, dEab, etc.).

[0144] "Judgment items and tolerance values" refer to the judgment items and their tolerance values ​​determined by standards. The "judgment items and tolerance values" can be set strictly or leniently depending on the user's application.

[0145] "Data acquisition mode" is a mode in the color management of the image forming apparatus 30 that relates to data acquisition from the reading device 40.

[0146] CPU 51 obtains the read data from online read unit 44 via communication unit 55. Regarding the read data, if it is the read data from colorimeter 45, then it is L... * a * b * The data, if it's data read by scanner 46, is RGB data and / or L... * a * b * Data. In addition, L * a * b * The value can also be other values ​​that represent color, such as XYZ value, concentration value, etc.

[0147] The CPU 51 (control unit) performs color management related to the image forming apparatus 30 (image forming engine) based on data read by the online reading unit 44 (reading device 40) provided in the paper transport path, regarding the paper printed by the image forming apparatus 30 (image forming engine). Color management includes at least one of color verification, color profile creation, and color correction.

[0148] Color verification has the following function: comparing the actual reading results of the color chart printed by the image forming apparatus 30 with the target value to verify whether the color verification benchmark is met.

[0149] The creation of color profiles is a function that creates profiles representing the color characteristics of the image forming apparatus 30.

[0150] Color correction is a function that corrects the colors printed by the image forming apparatus 30.

[0151] CPU 51 switches between a mode for acquiring data based on a precision-priority pattern (first pattern) and a mode for acquiring data based on a speed-priority pattern (second pattern). The data based on the precision-priority pattern includes not only data directly obtained from reading the precision-priority pattern in the reading device 40, but also data obtained by performing processes such as color transformation on the data obtained from reading the precision-priority pattern. The same applies to the data based on the speed-priority pattern.

[0152] The dimensions of each color patch (dimensions in the paper transport direction and paper width direction) are agreed upon in advance between the image forming apparatus 30 and the color management application. For example, the color patch read by the colorimeter 45 is set to 10~20mm × 10~20mm, and the color patch read by the scanner 46 is set to 10mm × 10mm, etc.

[0153] In addition, the data obtained by the CPU 51 is divided into data read by the colorimeter 45 and data read by the scanner 46 for storage.

[0154] As an example of a precision-priority pattern, pattern A is a pattern used for reading all color patches among a plurality of color patches arranged in the width direction of the paper by the colorimeter 45. Alternatively, pattern A may also include color patches among a plurality of color patches arranged in the width direction of the paper that have not been read by the colorimeter 45.

[0155] Figure 11 An example of a color chart 201 consisting of pattern A is shown. Regarding pattern A, the CPU 51 of the color management device 50 performs color management solely using data read from the colorimeter 45. The CPU 41 of the reading device 40 moves the colorimeter 45 along the width of the paper while measuring color, so that the colorimeter 45 reads all color patches on the color chart 201. The colorimeter 45 takes region 201A of the color chart 201 as its reading target. For example, Figure 11 The width W1 shown corresponds to the "first width" by which the colorimeter 45 moves in the paper width direction during the reading of pattern A. Furthermore, in Figure 11 In the diagram, the colorimeter 45 reads the color patch at the center position along the width of the paper, and the width W1 is shown. Figure 11 Arrow 201C in the image indicates the reading order of the colorimeter 45.

[0156] The data read by the colorimeter 45 for each color patch is obtained from the spectral colorimeter. The CPU 41 of the reading device 40 acquires the data read by the colorimeter 45 for each color patch. In the CPU 41, as the data read by the colorimeter 45, L is output for each color patch. * a * b * Values, concentration values, wavelength characteristics, etc.

[0157] The CPU 51 of the color management device 50, regarding pattern A, acquires the data (L) read by the colorimeter 45 for each color patch. * a * b * (Values, concentration values, wavelength characteristics, etc.), without obtaining the data read by the scanner 46.

[0158] As an example of a precision-priority pattern, pattern B is as follows: a colorimeter 45 reads a portion of a plurality of color patches arranged in the width direction of the paper, and a scanner 46 reads the other color patches in the plurality of color patches arranged in the width direction of the paper, excluding the portion of color patches read by the colorimeter 45.

[0159] Figure 12 An example of a color chart 202 consisting of pattern B is shown. Regarding pattern B, the CPU 51 of the color management device 50 performs color management using data read from both the colorimeter 45 and the scanner 46.

[0160] The CPU 41 of the reading device 40 causes the colorimeter 45 to read the color patch of area 202A on the color chart 202, and the colorimeter 45 moves along the width direction of the paper while measuring color. For example, Figure 12 The width W2 shown corresponds to the "first width" by which the colorimeter 45 moves in the paper width direction during the reading of pattern B. Furthermore, in Figure 12 In the diagram, the colorimeter 45 reads the color patch at the center position along the width of the paper, and the width W2 is shown. Figure 12 Arrow 202C indicates the reading order of the colorimeter 45.

[0161] CPU41 acquires the data from each color patch read by colorimeter 45. Within CPU41, as the data read by colorimeter 45, for each color patch, L is output. * a * b * Values, concentration values, wavelength characteristics, etc.

[0162] CPU41 causes scanner46 to read the color patch of region 202B on color chart 202. Figure 12Arrow 202D indicates the reading order of the color patches by scanner 46. However, since scanner 46 reads multiple color patches arranged in the width direction of the paper simultaneously, in Figure 12 Regardless of whether arrow 202D overlaps with the color block, color blocks at the same position in the paper transport direction within area 202B will be read simultaneously by scanner 46. About Figures 13-15 The arrows 203D, 204D, and 205D in the image are the same.

[0163] CPU41 acquires the data of each color block read by scanner 46. After obtaining the RGB values ​​from scanner 46 as the data for each color block, CPU41 converts the RGB values ​​into L... * a * b * Value. In CPU41, as the data read by scanner 46, L is output for each color patch. * a * b * value.

[0164] Regarding pattern B, the CPU 51 of the color management device 50 acquires data from a portion of the color blocks read by the colorimeter 45 among multiple color blocks arranged in the width direction of the paper, and acquires data from the scanner 46 reading the other color blocks among the multiple color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the colorimeter 45.

[0165] As an example of a speed-priority pattern, pattern C is as follows: the scanner 46 reads a portion of the color blocks arranged in the width direction of the paper, and the colorimeter 45 reads the other color blocks in the multiple color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the scanner 46.

[0166] Figure 13 An example of a color chart 203 consisting of pattern C is shown. Regarding pattern C, the CPU 51 of the color management device 50 performs color management using data read from both the scanner 46 and the colorimeter 45.

[0167] The CPU 41 of the reading device 40 causes the colorimeter 45 to read the color patch of region 203A on the color chart 203, and the colorimeter 45 moves along the width direction of the paper while measuring color. For example, Figure 13 The width W3 shown corresponds to the "second width" by which the colorimeter 45 moves in the paper width direction during the reading of pattern C. Furthermore, in Figure 13In the diagram, the colorimeter 45 is positioned at the center of the paper width direction where it reads the color patch, and the width W3 is shown. In reading pattern C, the width W3 by which the colorimeter 45 moves in the paper width direction is less than the width W1 by which the colorimeter 45 moves in the paper width direction in reading pattern A (see reference). Figure 11 In the reading of pattern C, the width W3 of the colorimeter 45 moving in the paper width direction is smaller than the width W2 of the colorimeter 45 moving in the paper width direction in the reading of pattern B (refer to...). Figure 12 ). Figure 13 Arrow 203C indicates the reading order of the colorimeter 45.

[0168] CPU41 causes scanner 46 to read the color patch of region 203B on color chart 203. Figure 13 Arrow 203D in the image indicates the reading order of the color patches by scanner 46.

[0169] The CPU 51 of the color management device 50 obtains data about pattern C from a portion of the color blocks read by the scanner 46 in the width direction of the paper, and also obtains data from the colorimeter 45 from the other color blocks in the width direction of the paper, excluding the portion of color blocks read by the scanner 46.

[0170] As an example of a speed-priority pattern, pattern D is a pattern used by the CPU 41 of the reading device 40 to correct the data read by the scanner 46 based on the data read by the colorimeter 45.

[0171] Figure 14 An example of a color chart 204 consisting of pattern D is shown. Regarding pattern D, the CPU 51 of the color management device 50 performs color management using the reading data of the scanner 46, which is calibrated based on the reading data of the colorimeter 45.

[0172] The CPU 41 of the reading device 40 causes the colorimeter 45 to read the color patch of area 204A on the color chart 204, so that the colorimeter 45 performs color measurement while the paper width direction is stopped. Figure 14 Arrow 204E indicates the reading order of the color patches read by the colorimeter 45 for obtaining data used in scanner calibration. In area 204A, the color patches read by the colorimeter 45 are arranged in a column in the center of the color chart 204 along the paper width direction. The color patches read by the colorimeter 45 are used to calibrate the scanner 46.

[0173] CPU41 causes scanner 46 to read the color patch of region 204B on color chart 204. Figure 14Arrow 204D indicates the reading order of the color patches by scanner 46. In color chart 204, color patches read by scanner 46 are arranged to the left and right of the color patches read by colorimeter 45.

[0174] Here, a method for correcting the reading data of the scanner 46 based on the reading data of the colorimeter 45 is described.

[0175] Among the color patches read by scanner 46, there are multiple common color patches that have the same color as the color patches read by colorimeter 45. Color patches of the same color are those formed in image forming unit 36 ​​with the same CMYK values ​​(or CMYKW values).

[0176] The CPU 41 of the reading device 40 obtains the L value of the common color patch read by the colorimeter 45. * a * b * Value (measured L) * a * b * value).

[0177] CPU41 converts the RGB values ​​of the common color patch read by scanner 46 into L colors according to the scanner configuration file of scanner 46. * a * b * Value, obtain the transformed inferred L * a * b * value.

[0178] CPU41 calculates the measured L based on the common color blocks. * a * b * Value and Prediction L * a * b * The difference in values ​​is used to correct the scanner profile of scanner 46 (calibration of scanner 46). The calibration of the scanner profile is equivalent to the calibration of the data read by scanner 46 based on the data read by colorimeter 45. CPU 41 transforms the data read by scanner 46 into L using the calibrated scanner profile. * a * b * After the value is obtained, it is provided to the color management device 50.

[0179] The CPU 51 of the color management device 50 obtains data from the scanner 46 for pattern D, which is then corrected based on data read by the colorimeter 45.

[0180] As an example of a speed-priority pattern, pattern E is a pattern for when the colorimeter 45 stops moving in the width direction of the paper and the scanner 46 reads all the color patches in a plurality of color patches arranged in the width direction of the paper. Alternatively, pattern E may also include color patches in a plurality of color patches arranged in the width direction of the paper that the scanner 46 has not read.

[0181] Figure 15 An example of a color table 205 composed of pattern E is shown. Regarding pattern E, the CPU 51 of the color management device 50 performs color management solely using data read from the scanner 46. The CPU 41 of the reading device 40 causes the scanner 46 to read color patches in region 205B on the color table 205. Figure 15 Arrow 205D in the image indicates the reading order of the color patches by scanner 46.

[0182] For pattern E, the colorimeter 45 reads 0 color patches. When using pattern E, no correction is performed on the reading data of the scanner 46 based on the reading data of the colorimeter 45.

[0183] The CPU 41 of the reading device 40 acquires the data of each color block read by the scanner 46. After acquiring the RGB values ​​from the scanner 46 as the data for each color block, the CPU 41 converts the RGB values ​​into L... * a * b * Value. In CPU41, as the data read by scanner 46, L is output for each color patch. * a * b * value.

[0184] The CPU 51 of the color management device 50 acquires data from the scanner 46 regarding pattern E, but does not acquire data from the colorimeter 45.

[0185] Regarding the ratio of data read by the colorimeter 45 to data read by the scanner 46, when comparing patterns A through E, the ratio of data read by the colorimeter 45 is highest in pattern A. Among patterns A through E, the ratio of data read by the scanner 46 is highest in pattern E. For patterns B, C, and D, the ratios of data read by the colorimeter 45 and the scanner 46 are different.

[0186] Furthermore, among patterns A to E, pattern A has the largest number of color patches read by colorimeter 45. Among patterns A to E, pattern E has the largest number of color patches read by scanner 46.

[0187] Furthermore, when pattern D or pattern E is used as a speed-priority pattern, pattern C can also become a precision-priority pattern. Additionally, when pattern A is used as a precision-priority pattern, pattern B can also become a speed-priority pattern.

[0188] exist Figures 11-15 In the color charts 201-205 shown, the size of the color patch read by the colorimeter 45 is larger than the size of the color patch read by the scanner 46. Alternatively, the color patches read by the colorimeter 45 and the color patches read by the scanner 46 can also be the same size.

[0189] (Color verification)

[0190] Here, we will explain the color verification process.

[0191] The CPU 51 of the color management device 50 instructs the image forming apparatus 30 of the color management object to print a color verification color table (color patch group). The CPU 51 sends the printing instruction for the color verification color table to the printer controller 20 via the communication unit 55. The printing instruction for the color verification color table includes the color verification color table specification, paper specification, halftone screen, number of copies, and the configuration file applied during color verification. The CPU 21 of the printer controller 20 performs RIP processing on the color table data. The CPU 21 sends the printing instruction for the color verification color table, containing the processed image data, to the image forming apparatus 30 of the color management object via the communication unit 25. In the image forming apparatus 30 of the color management object, the CPU 31 controls the image forming unit 36 ​​to print the color verification color table.

[0192] Next, the CPU 51 of the color management device 50 instructs the reading device 40, which corresponds to the image forming apparatus 30 of the color management object, to read the color verification color table. The CPU 51 sends a reading instruction for the color verification color table to the reading device 40 via the communication unit 55. In the reading device 40, the CPU 41 controls the online reading unit 44 (colorimeter 45, scanner 46) to read the color verification color table. The CPU 51 of the color management device 50, via the communication unit 55, acquires read data from the reading device 40 in the data acquisition mode corresponding to the color verification color table.

[0193] Next, the CPU 51 of the color management device 50 compares the read data (color measurement value) with the color verification standard and various tolerance values ​​to determine whether the color printed by the image forming apparatus 30 meets the color verification benchmark. The CPU 51 stores the determination result in the storage unit 52 and displays the determination result on the display unit 53.

[0194] (Creating a color profile)

[0195] Next, we will explain how to create a color profile.

[0196] The CPU 51 of the color management device 50 enables the image forming apparatus 30 of the color management object to print a color table for creating a configuration file.

[0197] Next, the CPU 51 causes the reading device 40, which corresponds to the image forming apparatus 30 for color management, to read the color table used for creating the configuration file. The CPU 51 obtains the read data from the reading device 40 via the communication unit 55 in the data acquisition mode corresponding to the color table used for creating the configuration file.

[0198] Regarding the printing and reading of color charts, the process is the same as for color verification, except that the color charts themselves differ, so details are omitted.

[0199] For each color swatch contained in the color table used to create the configuration file, the absolute value (L) of the target color is predetermined. * a * b * (Value, etc.)

[0200] CPU 51 creates a color profile based on the difference between the read data (measured color value) and the target value in each color patch. For example, CPU 51 creates a printer profile, a device link profile, etc. CPU 51 sends the created color profile to the image forming apparatus 30 of the color management object via the communication unit 55.

[0201] In the image forming apparatus 30 for color management objects, the CPU 31 stores the color profile in the storage unit 32.

[0202] (Color Correction)

[0203] Next, color correction will be explained. Color correction includes adjusting the maximum density in the image forming apparatus 30, adjusting in-plane unevenness, and adjusting grayscale.

[0204] The CPU 51 of the color management device 50 performs color correction specified by the user.

[0205] CPU51 enables the image forming apparatus 30 for color management objects to print color tables for color correction.

[0206] Next, the CPU 51 causes the reading device 40, which corresponds to the image forming apparatus 30 for color management, to read the color table for color correction. The CPU 51 obtains the read data from the reading device 40 via the communication unit 55 in the data acquisition mode corresponding to the color table for color correction.

[0207] Regarding the printing and reading of color charts, the process is the same as for color verification, except that the color chart being processed differs; therefore, details are omitted. Furthermore, regarding the printing of color charts, without requiring processing in the printer controller 20, the printing instruction for the color chart can be directly sent from the color management device 50 to the image forming apparatus 30, which is the object of color management.

[0208] For example, in the case of maximum concentration adjustment, CPU 51 displays the comparison result of the maximum concentration measurement result with the predetermined target value for each color of CMYK (or CMYKW) on the display unit 53. CPU 51 accepts input of adjustment values ​​related to the maximum concentration based on the user's operation using the operation unit 54. Alternatively, CPU 51 may automatically calculate the adjustment value related to the maximum concentration based on the measurement result and the target value. CPU 51 sends the adjustment value related to the maximum concentration to the image forming apparatus 30 of the color management object via the communication unit 55.

[0209] In the image forming apparatus 30 for color management objects, the CPU 31 stores the adjustment value related to the highest concentration in the storage unit 32.

[0210] (Color matching for color samples)

[0211] Next, we will explain the color matching for the color samples.

[0212] The CPU 51 of the color management device 50 creates (corrects) a target profile used to ensure that the color of the printed material from the image forming apparatus 30 matches the color of the color sample (target output). The CPU 51 provides the created target profile to the image forming apparatus 30. The color sample is the output received from the customer upon submission; it is not data, but the actual output. The target profile represents the original image data (CMYK values) input to the target printing press that has printed the color sample, and the colorimetric values ​​(L...) obtained from the color sample. * a * b * The correspondence between values.

[0213] The CPU51 acquires the original image data (CMYK values) corresponding to the color samples. The original image data is the image data that becomes the printing source of the color samples, and it is the data delivered by the customer.

[0214] CPU 51 acquires read image data (RGB values) obtained by reading color samples from the document reading unit 37 of the image forming apparatus 30. CPU 51 uses a pre-prepared scanner profile of the document reading unit 37 to convert the RGB values ​​of the read image data into L... * a * b *Furthermore, the scanner profile set for the original document reading unit 37 is a reliable profile. Additionally, the CPU 51 can also obtain colorimetric values ​​(L) for color samples from a colorimeter or similar device connected to the color management unit 50. * a * b * value).

[0215] The CPU 51 of the color management device 50 uses the corresponding positions of the original image data and the read image data to correlate CMYK values ​​with L. * a * b * A table mapping values. Based on this table, the CPU51 creates a target profile to ensure that the colors match the color samples.

[0216] By combining the creation of the target profile and the creation of the printer profile, the color of the printed material from the image forming apparatus 30 can be made to match the color of the color sample.

[0217] (Regarding the operation of the colorimeter)

[0218] Next, the operation of the colorimeter 45 in the reading device 40 will be explained in detail. The reading process of the colorimeter 45 requires movement of the colorimeter 45 along the width of the paper.

[0219] First, let's explain the spot color measurement mode. Spot color measurement mode is a mode that performs color measurement on each color block individually.

[0220] Figure 16 It will be composed of pattern C (refer to) Figure 13 A magnified image of a portion of the color patch in color chart 203, which is composed of colorimeter 45 and read from the colorimeter. Figure 16 In this diagram, the paper width direction is represented by the x-axis, and the paper transport direction is represented by the y-axis.

[0221] Here, the color patches read by the colorimeter 45 are assumed to be 20mm x 20mm in size. Furthermore, the gaps in the width direction of the paper within the color patches read by the colorimeter 45 are assumed to be 0.5mm.

[0222] Regarding the x-axis direction, the CPU 41 of the reading device 40 aligns the colorimeter 45 with the color patch by moving the colorimeter 45 in the paper width direction.

[0223] Regarding the y-axis direction, the CPU41 aligns the colorimeter 45 with the color block by moving the paper.

[0224] Specifically, the CPU 41 moves the colorimeter 45 along the width of the paper so that it is positioned at the center of color patch P1 along the x-axis. Next, the CPU 41 feeds the paper and stops feeding it when the colorimeter 45 is positioned at the center of color patch P1 along the y-axis. Thus, the CPU 41 sets the colorimeter 45 to the starting position for measuring color patch P1.

[0225] The procedure after the start of the measurement is as follows.

[0226] (1) CPU41 uses colorimeter 45 to measure color patch P1 and obtain data.

[0227] (2) CPU41 moves colorimeter 45 in the +x direction and adds the width of the color block 20mm and the gap 0.5mm to get 20.5mm.

[0228] (3) CPU41 uses colorimeter 45 to measure color patch P2 and obtain data.

[0229] (4) CPU41 moves the paper along the y-axis by 20mm in width of the color block and then stops.

[0230] (5) CPU41 uses colorimeter 45 to measure color patch P4 and obtain data.

[0231] (6) CPU41 moves colorimeter 45 in the -x direction and adds the width of the color patch (20mm) and the gap (0.5mm) to get 20.5mm.

[0232] (7) CPU41 uses colorimeter 45 to measure color patch P3 and obtain data.

[0233] (8) CPU41 moves the paper along the y-axis by 20mm in width of the color block and then stops.

[0234] (9) CPU41 uses colorimeter 45 to measure color patch P5 and obtain data.

[0235] The CPU41 then controls the colorimeter 45 to measure color by repeating the same process.

[0236] Figure 16 This is an example of a case where two color patches are arranged in the width direction of the paper, as read by the colorimeter 45. However, the same applies to cases where three or more color patches are arranged in the width direction of the paper.

[0237] Next, the line measurement mode will be explained. Line measurement mode is the operation mode in which the colorimeter 45 performs color measurements line by line. During the measurement of each line, for example, if the color difference between the measured color patches is above a threshold, the CPU 41 classifies them as different color patches. Additionally, the CPU 41 distinguishes different color patches by identifying gaps (boundary lines) between them. A gap is defined for each colorimeter 45; the gap may be, for example, a white or black line with a width of 0.5 mm.

[0238] Figure 17 This is an enlarged image of a portion of the color patch read by the colorimeter 45 from the color chart 203, which consists of pattern C. Figure 17 In this paper, the width direction of the paper is represented as the x-axis direction, and the paper conveying direction is represented as the y-axis direction.

[0239] Here, the color patches read by the colorimeter 45 are assumed to be 20mm x 20mm in size. Furthermore, the gaps in the width direction of the paper within the color patches read by the colorimeter 45 are assumed to be 0.5mm.

[0240] In the online color measurement mode of CPU41, the colorimeter 45 starts measuring color from the paper substrate, moving the colorimeter 45 along the width of the paper. CPU41 guides the colorimeter 45 across the color patches arranged along the x-axis and ends the measurement at the paper substrate, thus obtaining one line of color measurement data. The paper substrate is the portion of the paper itself without printed color patches. The one line of color measurement data is a time-series data of the color measurement values. Specifically, the color measurement objects of the colorimeter 45 vary according to the starting side of the paper substrate, color patches, gaps, color patches, gaps, ..., and the ending side of the paper substrate. CPU41 removes the color measurement values ​​corresponding to the paper substrate and gaps from the one line of color measurement data to obtain the color measurement values ​​for each color patch.

[0241] In order for the colorimeter 45 to standby at the position of the paper substrate, the CPU 41 moves the colorimeter 45 in the width direction of the paper and sets the colorimeter 45 at a position offset 18mm in the -x direction from the center position of the color patch P11 in the x-axis direction. The 18mm is the value obtained by adding 8mm to half the width of one color patch.

[0242] Regarding the y-axis direction, the CPU 41 feeds the paper and stops feeding it at the center position of the colorimeter 45 along the y-axis direction, where the colorimeter 45 becomes the color patch P11. Thus, the CPU 41 sets the colorimeter 45 to the measurement start position Q1.

[0243] Taking into account the gaps and the paper substrate before and after the measurement, the movement distance of the colorimeter 45 in the width direction of each row of paper is 56.5 mm (18 mm + 20 mm + 0.5 mm + 18 mm).

[0244] When measuring from the paper substrate, the procedure is as follows.

[0245] (1) CPU41 moves colorimeter 45 56.5mm in the +x direction and obtains 1 line of colorimetric data.

[0246] (2) CPU41 obtains the data of color block P11 and color block P12 from the color measurement data of line 1.

[0247] (3) CPU41 moves the paper along the y-axis by 20mm in width of the color block and then stops.

[0248] (4) CPU41 moves colorimeter 45 56.5mm in the -x direction and obtains 1 line of colorimetric data.

[0249] (5) CPU41 obtains the data of color block P14 and color block P13 from the color measurement data of line 1.

[0250] (6) CPU41 moves the paper along the y-axis by 20mm in width of the color block and then stops.

[0251] (7) CPU41 moves colorimeter 45 56.5mm in the +x direction and obtains 1 line of colorimetric data.

[0252] (8) CPU41 obtains the data of color block P15 and color block P16 from the color measurement data of line 1.

[0253] The CPU41 then controls the colorimeter 45 to measure color by repeating the same process.

[0254] Furthermore, if the number of color patches for which data (color values) has been obtained from the color measurement data of row 1 is less than the number of color patches when the reading action is determined, CPU 41 can also reverse the movement of colorimeter 45 to try to obtain color patch data again for the same row.

[0255] For example, in the above process (5), if only the data of one color block is obtained, the CPU41 does not perform the paper transfer in the next process (6), but performs the following processing.

[0256] CPU41 moves colorimeter 45 56.5mm in the +x direction and acquires one line of colorimetric data.

[0257] CPU41 obtains the data for color blocks P13 and P14 from the color measurement data in line 1.

[0258] After this, the movement of the colorimeter 45 in the width direction of the paper is reversed in the ±x direction.

[0259] Figure 17This is an example of a case where two color patches are arranged in the width direction of the paper, as read by the colorimeter 45. However, the same applies to cases where three or more color patches are arranged in the width direction of the paper.

[0260] If there are two or more color blocks arranged in the width direction of the paper, line color measurement can be used with the colorimeter 45. If there are gaps between the color blocks on the color chart, both spot and line color measurement can be used. In the following description, the color measurement of the colorimeter 45 can be any color measurement method, such as spot or line measurement. The CPU 41 of the reading device 40 can also automatically determine which color measurement method processes faster and select the color measurement method with the shorter processing time. For example, the CPU 41 preferably selects line color measurement for pattern A.

[0261] Next, the operation of the color management system 100 in the first embodiment will be described.

[0262] Figure 18 This is a flowchart illustrating the first color management execution process performed in the color management device 50.

[0263] First, the CPU 51 accepts the selection of the image forming apparatus 30 as the object of color management (step S1). The user selects the image forming apparatus 30 through an operation performed by the operation unit 54.

[0264] Next, CPU 51 handles the selection of a color management function (step S2). The user selects a color management function through the operation unit 54. The color management function may include, for example, color verification, color profile creation, or a combination of one or more of color correction.

[0265] Next, CPU51 accepts the paper printing settings (step S3).

[0266] Figure 19 This shows a data structure for the paper printing settings information set in step S3.

[0267] "Paper Printing Settings Information" includes paper information for the paper as the object of color management, and printing settings.

[0268] The "Paper Information" includes the paper feed tray, paper configuration file, paper size, paper feed direction, paper type, paper weight, paper color, and perforation.

[0269] The "Print Setup" includes settings such as screen size, number of copies (number of color averaging cycles), and color verification application profile (DLP / target profile).

[0270] Users can set various items such as paper information and printing settings for the paper as the object of color management through operations performed by the operation unit 54.

[0271] Next, CPU51 accepts the selection of the pattern (color chart) used in color management (step S4). CPU51 makes Figure 20 The color measurement setting screen 60 shown is displayed on the display unit 53. The color measurement setting screen 60 includes a pattern selection bar 61, a colorimeter display bar 62, a color measurement condition selection bar 63, a color measurement averaging count input bar 64, and a processing time display bar 65.

[0272] Pattern selection bar 61 is an area for selecting any pattern from pre-registered patterns (color charts). Here, the options for patterns A to E are displayed as drop-down menus, allowing selection of any pattern.

[0273] The colorimeter display bar 62 displays the colorimeter corresponding to the pattern selected in the pattern selection bar 61.

[0274] The color measurement condition selection bar 63 is the area used to select color measurement conditions.

[0275] The colorimetric averaging count input field 64 is the area used to input the number of colorimetric averaging counts.

[0276] The processing time display bar 65 shows the processing time related to the color management of the pattern selected in the pattern selection bar 61.

[0277] By operating the operation unit 54, the user selects a pattern for color management in the pattern selection bar 61 of the color measurement setting screen 60.

[0278] Next, the CPU 51 determines the data acquisition mode corresponding to the selected pattern (step S5). For example, if pattern A is selected, the CPU 51 then acquires data from the reading device 40 in the mode of acquiring data based on pattern A (data acquisition mode).

[0279] Next, the CPU 51 processes the settings of each item in the dataset constituting color management (step S6). For example, the user sets each item in the color measurement condition selection bar 63, color measurement averaging times input bar 64, etc., on the color measurement setting screen 60 through operations performed using the operation unit 54. Furthermore, in Figure 20 Although not illustrated, it is possible to set the data to be included in the color management dataset table T2 (see reference). Figure 10 (The various items of )

[0280] Next, the CPU 51 sends a printing instruction for the color chart to the printer controller 20 or the image forming apparatus 30 via the communication unit 55 (step S7). Specifically, the CPU 51 sends a color management dataset, paper printing setting information, and color chart information as color chart-related data to the image forming apparatus 30. The color management dataset is the information set in step S6. The paper printing setting information is the information set in step S3. The color chart information is information representing the color chart corresponding to the pattern selected in step S4. Image data, CGATS data, etc., are used as the color chart information.

[0281] The CPU 31 of the image forming apparatus 30 controls the image forming unit 36 ​​to print color charts. Specifically, the CPU 31 causes the image forming unit 36 ​​to print color charts according to paper printing settings. The CPU 31 then transfers the printed paper (color chart) to the reading device 40. Based on the color measurement settings and color chart information contained in the color management dataset, the CPU 31 determines the area read by the colorimeter 45 and the area read by the scanner 46 within the color chart, and determines the number of color patches in each area. Based on the area read by the colorimeter 45, the area read by the scanner 46, and the number of color patches in each area, the CPU 31 determines the reading operation of the colorimeter 45 and the scanner 46 in the reading device 40. The CPU 31 sends information indicating the reading operation to the reading device 40 via the communication unit 35.

[0282] Next, the CPU 51 of the color management device 50 sends a reading instruction for the color table to the reading device 40 via the communication unit 55 (step S8).

[0283] The CPU 41 of the reading device 40 controls the online reading unit 44 to read the color table. The CPU 41 controls the reading of the color table in the colorimeter 45 and the scanner 46 according to the reading instruction of the color table received from the color management device 50 and the information indicating the reading operation received from the image forming device 30.

[0284] The CPU 51 of the color management device 50 obtains the data read by the reading device 40 via the communication unit 55 in the determined data acquisition mode (step S9).

[0285] The CPU 51 performs color management of the image forming apparatus 30 based on the acquired data (step S10). The CPU 51 performs color management of the image forming apparatus 30 based on the color management dataset set in step S6. Details regarding color management are as described above.

[0286] The first color management process has now concluded.

[0287] This explains that in Figure 20The color measurement setting screen 60 shown accepts the selection of a pattern (color chart) in the pattern selection bar 61. Alternatively, the CPU 51 can also accept the selection of the data acquisition mode in the color management device 50 and automatically select the pattern corresponding to the data acquisition mode.

[0288] According to the first embodiment, the CPU 51 of the color management device 50 switches between a mode for acquiring data based on a precision-priority pattern (first pattern) and a mode for acquiring data based on a speed-priority pattern (second pattern). Therefore, the CPU 51 can perform color management by combining the required balance between quality and delivery time.

[0289] In recent years, with the advancement of image forming technology, there has been an increase in variations in image forming processes, such as printing using special color toners, decorative printing, and printing on special papers. For example, in cases where images are formed using CMYK toners on white toners, or in cases where grayscale images are formed using only CMY toners without using K toner (black toner), the accuracy of the color measurement values ​​of the scanner 46 sometimes decreases. In such situations, the present invention is particularly effective.

[0290] For example, in obtaining pattern A (reference) Figure 11 In the data mode, CPU 51 uses only the data read by colorimeter 45 for color management. Therefore, CPU 51 can perform color management with high precision.

[0291] Based on pattern E (reference) Figure 15 In the data mode, CPU 51 uses only the data read by scanner 46 for color management. Therefore, CPU 51 can reduce the time required to read the color table and perform color management at high speed.

[0292] Based on pattern B (reference) Figure 12 The data pattern, and the acquisition of pattern C (refer to) Figure 13 In the data mode, CPU 51 uses data read from both colorimeter 45 and scanner 46 for color management. Therefore, CPU 51 can perform color management while achieving a balance between accuracy and speed.

[0293] In obtaining pattern D (reference) Figure 14 In the data mode, CPU 51 performs color management using data read by scanner 46 that has been corrected based on data read by colorimeter 45. By using data read by scanner 46 that has been corrected based on data read by colorimeter 45, CPU 51 can ensure accuracy in color management.

[0294] In addition, in the reading device 40, when reading the color chart corresponding to pattern D or pattern E, the colorimeter 45 does not move in the paper width direction, so the time required for reading the color chart can be suppressed.

[0295] Furthermore, in the first embodiment, the CPU 31 of the image forming apparatus 30 is configured to determine the area read by the colorimeter 45 in the color chart, the area read by the scanner 46, and the number of color blocks in each area. Alternatively, the CPU 51 of the color management apparatus 50 may send information including the area read by the colorimeter 45 in the color chart, the area read by the scanner 46, and the number of color blocks in each area to the reading apparatus 40 via the communication unit 55.

[0296] [Second Implementation]

[0297] Next, the second embodiment of the present invention will be described.

[0298] The structure of the color management system in the second embodiment is the same as that of the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used and descriptions are omitted for structural parts that are the same as those in the first embodiment. Hereinafter, the characteristic structure and processing of the second embodiment will be described.

[0299] The CPU 51 of the color management device 50 performs color management based on the color management dataset.

[0300] CPU51 handles the configuration of the dataset for color management.

[0301] The CPU51 acquires the settings of the mode (data acquisition mode) corresponding to the set color management dataset.

[0302] The CPU51 acquires data in the mode specified by the mode setting.

[0303] Specifically, the CPU51 acquires data under the mode specified in the mode settings contained in the set color management dataset.

[0304] Next, the operation of the color management system 100 in the second embodiment will be described.

[0305] Figure 21 This is a flowchart illustrating the second color management execution process performed in the color management device 50.

[0306] The processing of steps S11~S13 and the execution of the first color management process (refer to...) Figure 18 The processing of steps S1 to S3 in the above is the same, so the explanation is omitted.

[0307] Next, CPU51 handles the setting of the color management dataset (step S14). CPU51 then... Figure 22 The color management dataset selection screen 70 is displayed on the display unit 53. The color management dataset selection screen 70 includes a color management dataset selection bar 71, a colorimeter display bar 72, a data acquisition mode display bar 73, a color measurement condition display bar 74, a color measurement averaging count display bar 75, and a processing time display bar 76.

[0308] Color management dataset selection bar 71 is used to select from the data registered in color management dataset table T2 (see reference). Figure 10 Select any region of the color management dataset in the color management dataset (target configuration).

[0309] The colorimeter display bar 72, the data acquisition mode display bar 73, the color measurement condition display bar 74, and the color measurement averaging count display bar 75 respectively display the various settings contained in the color management dataset selected in the color management dataset selection bar 71.

[0310] The processing time display bar 76 displays the processing time related to the color management corresponding to the data acquisition mode displayed in the data acquisition mode display bar 73.

[0311] In the color management dataset selection bar 71 of the color management dataset selection screen 70, the user can set any color management dataset by using the operation unit 54.

[0312] CPU51 determines the data acquisition mode corresponding to the set color management dataset (step S15). Specifically, CPU51 refers to the color management dataset table T2 and obtains the setting of the data acquisition mode contained in the set color management dataset.

[0313] Next, CPU51 selects the color table (pattern) contained in the set color management dataset. Specifically, CPU51 refers to table T2 of the color management dataset and obtains the characteristic color table and color verification control bar contained in the set color management dataset.

[0314] Next, the CPU 51 sends a printing instruction for the color chart to the printer controller 20 or the image forming apparatus 30 via the communication unit 55 (step S17). Specifically, the CPU 51 sends a color management dataset, paper printing setting information, and color chart information to the image forming apparatus 30 as data related to the color chart. The color management dataset is the information set in step S14. The paper printing setting information is the information set in step S13. The color chart information indicates the color chart selected in step S16. Image data, CGATS data, etc., are used as the color chart information.

[0315] The printing of the color table in the image forming apparatus 30 is performed in the same manner as the first color management process.

[0316] Furthermore, the processing of steps S18 to S20 is the same as that of steps S8 to S10 in the first color management execution process, so the explanation is omitted.

[0317] The second color management process has now concluded.

[0318] According to the second embodiment, the CPU 51 of the color management device 50, like that in the first embodiment, is capable of performing color management by combining the required balance between quality and delivery time.

[0319] In addition, the CPU51 accepts the settings of the color management dataset and obtains the settings of the mode corresponding to the set color management dataset. Specifically, the CPU51 obtains the settings of the data acquisition mode contained in the set color management dataset. Therefore, the CPU51 does not force the operator to make difficult judgments, but can obtain the data acquisition mode settings based on the settings of the color management dataset.

[0320] Furthermore, in the second embodiment, it was explained that the data acquisition mode setting is included in the color management dataset. The data acquisition mode setting does not need to be included in the color management dataset, and can also be managed as data different from the color management dataset. When the CPU 51 of the color management device 50 acquires the data acquisition mode setting, it is sufficient to determine the data acquisition mode setting corresponding to the color management dataset.

[0321] [Third Implementation]

[0322] Next, the third embodiment of the present invention will be described.

[0323] The structure of the color management system in the third embodiment is the same as that of the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used for structural parts that are the same as those in the first embodiment, and descriptions are omitted. Hereinafter, the characteristic structure and processing of the third embodiment will be described.

[0324] In a color management-related process, the CPU 51 of the color management device 50 switches between a mode for acquiring data based on a precision-priority pattern (first pattern) and a mode for acquiring data based on a speed-priority pattern (second pattern). For example, the CPU 51 switches the data acquisition mode within a single process, such as color verification, color profile creation, or color correction.

[0325] CPU51 switches between modes of acquiring data based on a precision-priority pattern and a speed-priority pattern, depending on the ratio determined by the user's settings.

[0326] CPU51 acquires data based on a precision-priority pattern for a first region in a sheet of paper, and acquires data based on a speed-priority pattern for a second region in the sheet of paper that is different from the first region. That is, in a color table for color management printed by the image forming apparatus 30, there are regions with printing precision-priority patterns and regions with printing speed-priority patterns.

[0327] Figure 23 An example of color table 206, which includes both precision-priority and speed-priority patterns on the same page, is shown. Color table 206 includes pattern A printed on it (see reference). Figure 11 Area PA and area D printed with pattern (see reference) Figure 14 The area PD includes area PD1 read by colorimeter 45 and area PD2 read by scanner 46.

[0328] The CPU 41 of the reading device 40 causes the colorimeter 45 to read the color patch of area PD1 on the color chart 206, so that the colorimeter 45 performs color measurement while the paper width direction is stopped. Figure 23 Arrow 206E indicates the reading order of the color patches read by the colorimeter 45 for obtaining data used for scanner calibration. The CPU 41 causes the scanner 46 to read the color patches of region PD2 on the color chart 206. Figure 23 Arrow 206D in the diagram indicates the reading order of the color patches by scanner 46. Furthermore, in Figure 23 Regardless of whether arrow 206D overlaps with a color block, color blocks at the same position in the paper transport direction within area PD2 are simultaneously read by scanner 46. The CPU 51 of color management device 50 obtains pattern-based data from reading device 40 regarding area PD of color chart 206. Specifically, CPU 51 obtains reading data from scanner 46 that has been corrected based on reading data from colorimeter 45.

[0329] The CPU 41 of the reading device 40 causes the colorimeter 45 to read the color patch of area PA on the color chart 206, and the colorimeter 45 moves in the width direction of the paper while measuring color. Figure 23 Arrow 206C indicates the reading order of the color patches by the colorimeter 45. The CPU 51 of the color management device 50 obtains data based on pattern A from the reading device 40 regarding region PA on the color table 206.

[0330] exist Figure 23 In the example shown, the CPU 51 of the color management device 50 switches the data acquisition mode within a single sheet of paper.

[0331] The image forming apparatus 30 (image forming engine) can also print color blocks onto multiple sheets of paper.

[0332] The CPU 51 of the color management device 50 acquires data based on a precision-priority pattern for the first paper among a plurality of papers, and acquires data based on a speed-priority pattern for the second paper among a plurality of papers that is different from the first paper.

[0333] Figure 24 Examples are shown of color tables 2071-2074, which consist of multiple pages, including precision-priority patterns and speed-priority patterns. Color table 2071 on page 1 and color table 2072 on page 2 include printed pattern D (refer to...). Figure 14 The area PD of ) is included in color chart 2073 on page 3 and color chart 2074 on page 4. This includes areas printed with pattern A (see reference). Figure 11 The region PA.

[0334] Regarding the reading control performed by the reading device 40 for each area PD and PA, and color table 206 (see reference) Figure 23 The situation is the same.

[0335] CPU51 obtains data based on pattern D (speed priority pattern) for color tables 2071 and 2072 in multiple sheets of paper. CPU51 obtains data based on pattern A (precision priority pattern) for color tables 2073 and 2074 in multiple sheets of paper.

[0336] exist Figure 24 In the example shown, the CPU 51 of the color management device 50 switches data acquisition modes between pages.

[0337] Additionally, it allows for switching of data retrieval modes within the same page and between pages for color tables composed of multiple pages.

[0338] Figure 25 This illustrates an example where the switching positions for precision-priority patterns and speed-priority patterns are located on the same page in color tables 2081-2084, which consist of multiple pages. Color table 2081 on page 1 and color table 2082 on page 2 include printed pattern D (refer to...). Figure 14 The area PD is shown in color chart 2083 on page 3. It includes the area PD with pattern D printed on it and the area PD with pattern A printed on it (see reference). Figure 11 The area PA is shown in color chart 2084 on page 4. The area PA with pattern A is included.

[0339] Regarding the reading control performed by the reading device 40 for each area PD and PA, and color table 206 (see reference) Figure 23 The situation is the same.

[0340] The CPU 51 of the color management device 50 acquires data based on pattern D (speed priority pattern) for color tables 2081 and 2082. The CPU 51 acquires data based on pattern D for region PD of color table 2083, and data based on pattern A (precision priority pattern) for region PA of color table 2083. The CPU 51 acquires data based on pattern A for color table 2084.

[0341] exist Figure 25 In the example shown, the CPU 51 of the color management device 50 switches the data acquisition mode while on the third page. If the switching position of the pattern corresponding to the user-specified scale is inconsistent with the page, the CPU 51 causes pattern D and pattern A to coexist on the boundary page. On other pages, pattern D or pattern A is displayed on a page-by-page basis.

[0342] Here, we explain how to set the ratio of precision-priority patterns to speed-priority patterns. For example, processing can also be performed in the first color management stage (see [reference]). Figure 18 In step S4, when the user selects a pattern for color management, the ratio of precision-priority pattern to speed-priority pattern can be continuously changed.

[0343] Figure 26 An example of a color measurement setting screen 80 displayed on the display unit 53 is shown. The color measurement setting screen 80 includes a slider 81 for adjusting the pattern scale, a colorimeter display bar 82, a color measurement condition selection bar 83, a color measurement averaging count input bar 84, and a processing time display bar 85.

[0344] The user moves the slider 81 left and right using the operation unit 54, thereby changing the ratio of precision priority to speed priority in the pattern (color chart). For example, the user can adjust the precision priority to speed priority ratio to 30%, speed priority to 70%, etc. The CPU 51 selects a pattern from a pre-determined pattern that corresponds to the precision priority to speed priority ratio based on the position of the slider 81. Alternatively, the CPU 51 can also generate a pattern corresponding to the precision priority to speed priority ratio based on the position of the slider 81.

[0345] Regarding colorimeter display bar 82, colorimeter condition selection bar 83, colorimeter averaging count input bar 84, and processing time display bar 85, respectively... Figure 20 The colorimeter display bar 62, color measurement condition selection bar 63, color measurement averaging times input bar 64, and processing time display bar 65 shown are the same.

[0346] Additionally, when users select patterns for color management, they can choose multiple patterns (color charts) and continuously change the proportion of the selected patterns.

[0347] Figure 27 An example of a color measurement setting screen 90 displayed on the display unit 53 is shown. The color measurement setting screen 90 includes a pattern selection bar 91, a slider 92 for adjusting the pattern ratio, a colorimeter display bar 93, a color measurement condition selection bar 94, a color measurement averaging times input bar 95, and a processing time display bar 96.

[0348] Pattern selection bar 91 is used to select the area of ​​the pattern to be used. For example, patterns can be prepared in advance where the ratios of data read by the colorimeter 45 and the scanner 46 are different. Figure 27 In the example, pattern A and pattern E are selected in pattern selection bar 91.

[0349] The slider 92 is used to adjust the scaling of the pattern selected in the pattern selection bar 91. The user moves the slider 92 left or right by operating the operation unit 54, thereby changing the scaling of the selected pattern.

[0350] Regarding colorimeter display bar 93, colorimeter condition selection bar 94, colorimeter averaging count input bar 95, and processing time display bar 96, respectively... Figure 20 The colorimeter display bar 62, color measurement condition selection bar 63, color measurement averaging times input bar 64, and processing time display bar 65 shown are the same.

[0351] In addition, the color patches read by the colorimeter 45 and the color patches read by the scanner 46 can be continuously changed for the pattern that constitutes the color chart.

[0352] Figure 28 This shows an example of the priority of each color patch contained in a color table used for color management. Figure 28 In this process, the combination of CMYK values ​​of the colors that make up the color blocks is associated with their priority. For example, when the CPU 51 of the color management device 50 changes the structure of the pattern according to the proportion set by the user, the pattern is generated in such a way that the color blocks with the highest priority are read by the scanner 46 in sequence.

[0353] According to the third embodiment, the CPU 51 of the color management device 50, like that in the first embodiment, is capable of performing color management by combining the required balance between quality and delivery time.

[0354] In addition, the CPU51 switches the data acquisition mode in a process related to color management. As a result, the CPU51 can flexibly handle situations where a precision-priority pattern (pattern 1) and a speed-priority pattern (pattern 2) are mixed in the color table used for color management.

[0355] Furthermore, the CPU51 switches between a mode for acquiring data based on a precision-priority pattern and a mode for acquiring data based on a speed-priority pattern, depending on a ratio determined by the user's settings. For example, in Figure 26 In the color measurement settings screen 80 shown, the user can adjust the ratio of accuracy priority to speed priority by moving the slider 81 left or right. Additionally, in Figure 27 In the color measurement settings screen 90 shown, the user can select the pattern to be used in the pattern selection bar 91, and adjust the scale of the selected pattern by moving the slider 92 left and right.

[0356] In addition, when a single sheet of paper includes both precision-priority and speed-priority patterns, the CPU51 can switch data acquisition modes for each area within the paper.

[0357] In addition, regarding color charts composed of multiple sheets of paper, if each sheet is configured with either a precision-priority pattern or a speed-priority pattern, the CPU51 can switch the data acquisition mode for each sheet.

[0358] [Fourth Implementation]

[0359] Next, the fourth embodiment of the present invention will be described.

[0360] The structure of the color management system in the fourth embodiment is the same as that of the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used for structural parts that are the same as those in the first embodiment, and descriptions are omitted. Hereinafter, the characteristic structure and processing of the fourth embodiment will be described.

[0361] In the first to third embodiments, the case where the CPU 51 of the color management device 50 switches to acquire data based on patterns contained in the color table in a "data acquisition mode" is described. In the fourth embodiment, the image forming apparatus 30 switches between a precision-priority pattern (first pattern) and a speed-priority pattern (second pattern) for printing in order to perform color management of the image forming apparatus 30. Color management includes at least one of color verification, color profile creation, and color correction.

[0362] The image forming apparatus 30 includes an image forming unit 36 ​​(image forming engine). The image forming apparatus 30 can cooperate with a reading device 40, which is provided in the transport path of the paper printed by the image forming unit 36 ​​and includes a colorimeter 45 and a scanner 46.

[0363] The CPU 31 of the image forming apparatus 30 switches between a precision-priority pattern (first pattern) and a speed-priority pattern (second pattern) for printing. The information required for printing the precision-priority pattern and the speed-priority pattern can be either pre-stored in the storage unit 32 of the image forming apparatus 30 or obtained from the color management device 50. In addition, the functions of the color management device 50 shown in the first to third embodiments can also be incorporated into the image forming apparatus 30.

[0364] The precision priority pattern is a pattern used by the colorimeter 45 to move a first width in the width direction of the paper and to obtain data by reading all or a portion of the multiple color blocks arranged in the width direction of the paper.

[0365] The speed priority pattern is a pattern used by the colorimeter 45 to stop or move to a second width smaller than the first width in the paper width direction, and the scanner 46 to read all or part of the color blocks in the multiple color blocks arranged in the paper width direction to obtain data.

[0366] In a process related to color management of the image forming apparatus 30, the CPU 31 switches between a printing accuracy priority pattern mode and a printing speed priority pattern mode.

[0367] The CPU 31 switches between a printing precision-priority pattern mode and a printing speed-priority pattern mode based on a ratio determined from user-accepted settings. For example, the CPU 31 adjusts the ratio of precision-priority patterns and speed-priority patterns in the color table used for color management based on a ratio determined from user-accepted settings.

[0368] CPU31 can also prioritize printing accuracy for a first area of ​​a sheet of paper and prioritize printing speed for a second area of ​​a sheet of paper that is different from the first area.

[0369] CPU 31 controls image forming unit 36 ​​(image forming engine) to print color blocks onto multiple sheets of paper as a color table for color management.

[0370] CPU31 can also prioritize printing accuracy for the first paper among multiple sheets, and prioritize printing speed for the second paper among multiple sheets that is different from the first paper.

[0371] CPU31 can also serve as a precision-priority pattern without printing the area read by the scanner 46 of the reading device 40.

[0372] CPU31 can also serve as a speed-priority pattern without printing the area read by the colorimeter 45 of the reading device 40.

[0373] In speed-priority pattern reading, the colorimeter 45 of the reading device 40 can also stop in the paper width direction.

[0374] CPU31 prints multiple color blocks arranged in the width direction of the paper as a precision-priority pattern. A portion of the color blocks are read by colorimeter 45, and the other color blocks are read by scanner 46.

[0375] CPU31 prints multiple color blocks arranged in the width direction of the paper as a speed-priority pattern. A portion of the color blocks are read by scanner 46, and the other color blocks are read by colorimeter 45.

[0376] CPU31 can also be printed as a speed-priority pattern for areas read by colorimeter 45 to correct data read by scanner 46.

[0377] According to the fourth embodiment, the CPU 31 of the image forming apparatus 30 switches between a precision-priority pattern (first pattern) and a speed-priority pattern (second pattern) for printing based on the pattern (color chart) used in the color management of the image forming apparatus 30. Therefore, the CPU 51 of the color management device 50 is able to perform color management by combining the required balance between quality and delivery time.

[0378] [Fifth Implementation]

[0379] Next, the fifth embodiment of the present invention will be described.

[0380] The structure of the color management system in the fifth embodiment is the same as that of the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used for structural parts that are the same as those in the first embodiment, and descriptions are omitted. Hereinafter, the characteristic structure and processing of the fifth embodiment will be described.

[0381] In the first to third embodiments, the CPU 51 of the color management device 50 was described as switching to a "data acquisition mode" to acquire data based on patterns contained in a color table. In the fifth embodiment, the reading device 40 switches to a data reading mode used in the color management of the image forming apparatus 30. Color management includes at least one of color verification, color profile creation, and color correction.

[0382] The reading device 40 is installed on the paper transport path of the image forming unit 36 ​​(image forming engine) of the image forming apparatus 30. The reading device 40 includes a colorimeter 45 and a scanner 46.

[0383] The CPU 41 of the reading device 40 switches between a mode for acquiring data based on a precision priority pattern (first pattern) and a mode for acquiring data based on a speed priority pattern (second pattern).

[0384] The precision priority pattern is a pattern used for the colorimeter 45 to move a first width in the width direction of the paper, and for the colorimeter 45 to read all or a portion of the multiple color blocks arranged in the width direction of the paper.

[0385] The speed priority pattern is a pattern used when the colorimeter 45 stops or moves to a second width smaller than the first width in the paper width direction, and the scanner 46 reads all or a portion of the multiple color blocks arranged in the paper width direction.

[0386] In a color management-related process, CPU41 switches between a mode for acquiring data based on a precision-priority pattern and a mode for acquiring data based on a speed-priority pattern.

[0387] CPU41 switches between a mode for acquiring data based on a precision-priority pattern and a mode for acquiring data based on a speed-priority pattern, depending on the ratio determined by the user's settings.

[0388] CPU41 can also obtain data based on a precision-priority pattern for a first region of a sheet of paper, and data based on a speed-priority pattern for a second region of a sheet of paper that is different from the first region.

[0389] The CPU 31 of the image forming apparatus 30 controls the image forming unit 36 ​​(image forming engine) to print color blocks onto multiple sheets of paper as a color table for color management.

[0390] The CPU 41 of the reading device 40 can also obtain data based on a precision priority pattern for the first paper among a plurality of papers, and obtain data based on a speed priority pattern for the second paper among a plurality of papers that is different from the first paper.

[0391] CPU41 can also prioritize patterns and not acquire data read by scanner 46.

[0392] CPU41 can also prioritize the pattern and not obtain the data read by the colorimeter 45.

[0393] CPU41 can also stop the colorimeter 45 in the paper width direction during speed-priority pattern reading.

[0394] CPU41 can also acquire data from a portion of the multiple color blocks arranged in the width direction of the paper by the colorimeter 45, and data from the other color blocks arranged in the width direction of the paper by the scanner 46, excluding the portion of color blocks read by the colorimeter 45.

[0395] CPU41 can also acquire data from a portion of the multiple color blocks arranged in the width direction of the paper, which are read by scanner 46, and data from the other color blocks in the multiple color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by scanner 46, which are read by colorimeter 45.

[0396] CPU41 can also adjust the data read by scanner 46 based on the data read by colorimeter 45, according to the speed-priority pattern.

[0397] According to the fifth embodiment, the CPU 41 of the reading device 40 switches between modes (reading modes) for acquiring data used in the color management of the image forming apparatus 30. The CPU 41 switches between a mode for acquiring data based on a precision-priority pattern (first pattern) and a mode for acquiring data based on a speed-priority pattern (second pattern). Therefore, the CPU 51 of the color management device 50 can perform color management by combining the required balance between quality and delivery time.

[0398] Furthermore, the descriptions in the above embodiments are examples of the color management method, color management device, computer program product, image forming apparatus, and reading device involved in the present invention, and are not intended to limit the invention to these embodiments. The detailed structure and operation of each device constituting the system can be appropriately modified without departing from the spirit of the present invention.

[0399] For example, characteristic processes from each implementation can also be combined to perform the task.

[0400] Furthermore, the types and number of patterns used in the color management of the image forming apparatus 30 are not limited to the examples described above. Additionally, the number or arrangement of color blocks constituting the pattern (color table) can be appropriately changed.

[0401] Furthermore, the reading device 40 has been described as a device different from the image forming apparatus 30, but the reading device 40 (online reading unit 44) may also be part of the image forming apparatus 30.

[0402] Furthermore, the color management device 50 can be a standalone device or included in other devices. For example, the color management device 50 can be included in the printer controller 20 or the image forming apparatus 30, or it can be included in the reading device 40.

[0403] Furthermore, in the first to third embodiments described above, the various processes executed by the CPU 51 (color management application) of the color management device 50 may also be performed by other devices within the color management system 100 or by devices that can be connected to the color management system 100. Alternatively, the various processes executed by the CPU 51 of the color management device 50 may be performed collaboratively by multiple devices.

[0404] In the above embodiments, the image forming apparatus 30 is described as an electrophotographic image forming apparatus that uses toners to form images, but it is not limited to this. The image forming apparatus 30 may also be an inkjet image forming apparatus or the like.

[0405] Furthermore, the various data (printer information, color management datasets, etc.) stored in the storage unit 52 of the color management device 50 can be stored in external devices, as long as the CPU 51 can utilize them.

[0406] The computer-readable medium for storing programs used to execute various processes is not limited to the examples described above. Additionally, a carrier wave can also be used as the medium for providing data for programs via communication lines.

[0407] The embodiments disclosed above are for illustrative and exemplary purposes only and are not intended to be limiting. The scope of the invention should be interpreted through the description in the claims.

[0408] [Explanation of Symbols]

[0409] 10: PC; 20: Printer controller; 30: Image forming apparatus; 31: CPU; 32: Storage unit; 33: Display unit; 34: Operation unit; 35: Communication unit; 36: Image forming unit; 40: Reading device; 41: CPU; 42: Storage unit; 43: Communication unit; 44: Online reading unit; 45: Colorimeter; 46: Scanner; 50: Color management device; 51: CPU; 52: Storage unit; 53: Display unit; 54: Operation unit; 55: Communication unit; 100: Color management system; 521: Color management application program; N: Communication network; T1: Printer information form; T2: Color management dataset form.

Claims

1. A color management method, wherein, The color management device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern. The color management device performs color management related to the image forming engine based on data read by a reading device equipped with a colorimeter and a scanner installed in the paper transport path. The first pattern is a pattern used by the colorimeter to move a first width in the width direction of the paper, and for the colorimeter to read all or a portion of the color blocks among a plurality of color blocks arranged in the width direction of the paper. The second pattern is a pattern used by the colorimeter to stop or move a second width smaller than the first width in the paper width direction, and by the scanner to read all or a portion of the color blocks among a plurality of color blocks arranged in the paper width direction.

2. The color management method according to claim 1, wherein, In a process related to color management, the color management device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern.

3. The color management method according to claim 2, wherein, The color management device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern, according to a ratio determined based on settings received from the user.

4. The color management method according to claim 2, wherein, The color management device acquires data based on a first pattern for a first region in a piece of paper, and acquires data based on a second pattern for a second region in the same piece of paper that is different from the first region.

5. The color management method according to claim 2, wherein, The image forming engine prints color blocks onto multiple sheets of paper. The color management device acquires data based on a first pattern for a first paper among the plurality of papers, and acquires data based on a second pattern for a second paper among the plurality of papers that is different from the first paper.

6. The color management method according to claim 1, wherein, The color management device does not acquire the data read by the scanner for the first pattern.

7. The color management method according to claim 1, wherein, The color management device does not acquire data read by the colorimeter regarding the second pattern.

8. The color management method according to claim 1, wherein, During the reading of the second pattern, the colorimeter stops in the width direction of the paper.

9. The color management method according to claim 1, wherein, The color management device relates to the first pattern. The data is obtained by the colorimeter reading a portion of the color patches arranged along the width of the paper. The data is obtained by the scanner reading the color blocks other than the portion of color blocks read by the colorimeter from a plurality of color blocks arranged in the width direction of the paper.

10. The color management method according to claim 1, wherein, The color management device relates to the second pattern. The data obtained by the scanner reading a portion of the color blocks arranged along the width direction of the paper. The data is obtained by the colorimeter reading other color blocks among a plurality of color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the scanner.

11. The color management method according to claim 1, wherein, The reading device corrects the data read by the scanner based on the data read by the colorimeter regarding the second pattern.

12. The color management method according to claim 1, wherein, The color management device performs color management based on a color management dataset. The color management device accepts the setting of the color management dataset, obtains the setting of the mode corresponding to the set color management dataset, and obtains data in the mode represented by the obtained mode setting.

13. The color management method according to claim 12, wherein, The color management dataset includes the settings for the mode. The color management device acquires data according to the pattern represented by the pattern setting contained in the set color management dataset.

14. The color management method according to claim 1, wherein, The color management refers to at least one of color verification, color profile creation, and color correction.

15. A color management device comprising a control unit for performing the color management method according to any one of claims 1 to 14.

16. A computer program product for causing a computer controlling a color management device to execute the color management method according to any one of claims 1 to 14.

17. An image forming apparatus, wherein, The image forming apparatus includes an image forming engine. The image forming apparatus can cooperate with a reading device equipped with a colorimeter and a scanner, which is installed in the transport path of the paper printed by the image forming engine. The image forming engine switches between the first pattern and the second pattern for printing. The first pattern is a pattern used by the colorimeter to move a first width in the width direction of the paper, and the colorimeter reads all or a portion of the color blocks arranged in the width direction of the paper to obtain data. The second pattern is a pattern used by the colorimeter to stop or move a second width smaller than the first width in the paper width direction, and by the scanner to read all or part of the color blocks in the plurality of color blocks arranged in the paper width direction to obtain data.

18. The image forming apparatus according to claim 17, wherein, In a process related to the color management of the image forming apparatus, the image forming engine switches between the mode of printing the first pattern and the mode of printing the second pattern.

19. The image forming apparatus according to claim 18, wherein, The image forming engine switches between the printing mode of the first pattern and the printing mode of the second pattern according to a ratio determined based on settings received from the user.

20. The image forming apparatus according to claim 18, wherein, The image forming engine prints the first pattern about a first region in a piece of paper, and prints the second pattern about a second region in the same piece of paper that is different from the first region.

21. The image forming apparatus according to claim 18, wherein, The image forming engine prints color blocks onto multiple sheets of paper. The image forming engine prints the first pattern on a first paper of the plurality of papers, and prints the second pattern on a second paper of the plurality of papers that is different from the first paper.

22. The image forming apparatus according to claim 17, wherein, In the image forming engine, the area not printed by the scanner is the first pattern.

23. The image forming apparatus according to claim 17, wherein, In the image forming engine, the area read by the colorimeter is not printed as the second pattern.

24. A reading device disposed on the transport path of paper printed by an image forming engine, and comprising a colorimeter and a scanner, wherein, The reading device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern. The first pattern is a pattern used by the colorimeter to move a first width in the width direction of the paper, and for the colorimeter to read all or a portion of the color blocks among a plurality of color blocks arranged in the width direction of the paper. The second pattern is a pattern used by the colorimeter to stop or move a second width smaller than the first width in the paper width direction, and by the scanner to read all or a portion of the color blocks among a plurality of color blocks arranged in the paper width direction.

25. The reading device according to claim 24, wherein, In a process related to color management, the reading device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern.

26. The reading device according to claim 25, wherein, The reading device switches between a mode for acquiring data based on the first pattern and a mode for acquiring data based on the second pattern, depending on a ratio determined by a setting based on user acceptance.

27. The reading device according to claim 25, wherein, The reading device acquires data based on a first pattern for a first region in a piece of paper, and acquires data based on a second pattern for a second region in the same piece of paper that is different from the first region.

28. The reading device according to claim 25, wherein, The reading device acquires data based on a first pattern for a first paper among a plurality of papers printed with color blocks, and acquires data based on a second pattern for a second paper among the plurality of papers that is different from the first paper.

29. The reading device according to claim 24, wherein, The reading device does not acquire the data read by the scanner regarding the first pattern.

30. The reading device according to claim 24, wherein, The reading device does not acquire data read by the colorimeter regarding the second pattern.

31. The reading device according to claim 24, wherein, During the reading of the second pattern, the colorimeter stops in the width direction of the paper.

32. The reading device according to claim 24, wherein, The reading device relates to the first pattern. The data is obtained by the colorimeter reading a portion of the color patches arranged along the width of the paper. The data is obtained by the scanner reading the color blocks other than the portion of color blocks read by the colorimeter from a plurality of color blocks arranged in the width direction of the paper.

33. The reading device according to claim 24, wherein, The reading device is related to the second pattern. The data obtained by the scanner reading a portion of the color blocks arranged along the width direction of the paper. The data is obtained by the colorimeter reading other color blocks among a plurality of color blocks arranged in the width direction of the paper, excluding the portion of color blocks read by the scanner.

34. The reading device according to claim 24, wherein, The reading device corrects the data read by the scanner based on the data read by the colorimeter regarding the second pattern.

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