Color management method, color management device, program, image forming apparatus, and reading apparatus

Abstract

Color management is performed to balance the required quality and delivery time. [Solution] The color management device performs color management related to the image forming engine based on data read by a reader installed on the transport path of the paper printed by the image forming engine. The reader comprises a colorimeter and a scanner. The 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 first pattern is a pattern in which the colorimeter moves a first width in the paper width direction and reads all or some of the patches of a plurality of patches arranged in the paper width direction. The second pattern is a pattern in 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 some of the patches of a plurality of patches arranged in the paper width direction.

Description

Technical Field

[0001] The present invention relates to a color management method, a color management device, a program, an image forming apparatus, and a reading apparatus.

Background Art

[0002] There is an image forming apparatus that reads a sheet of paper on which a chart is printed by a reading apparatus (inline type reading apparatus) installed in a paper conveyance path and performs color management. In such an image forming apparatus, a series of processes such as printing of a chart, color measurement of the chart, and color management based on the color measurement data can be automated. For example, by a user performing a predetermined operation, a series of processes are executed. Therefore, even an operator with low knowledge or experience regarding so-called "color matching" work such as color verification and color correction can perform color management of the image forming apparatus.

[0003] In recent years, as an inline type reading apparatus, a type that includes both a scanner (such as a line type CCD sensor) and an optical colorimeter movable in a paper width direction (CD direction) orthogonal to the paper conveyance direction has been used (see Patent Document 1). The scanner has a high reading speed, but the accuracy of the color measurement value is lower than that of the optical colorimeter because it calculates color measurement values (L * a * b * values, XYZ values, etc.) from the read data (RGB values). On the other hand, the colorimeter has high accuracy of the color measurement value, but the reading speed is slow because it is necessary to move the colorimeter itself in the paper width direction while reading. Therefore, an operator is required to skillfully use the scanner and the colorimeter according to customer needs regarding color matching.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Generally, print shops and similar businesses that customers commission to print are expected to provide high-quality printed materials with short turnaround times. However, quality and turnaround time are often conflicting, making it difficult to achieve both simultaneously. Therefore, it is necessary to interview customers about their desired quality and turnaround time when accepting orders, and then perform color matching work to match the balance between the quality and turnaround time that the customer requires.

[0006] In-line colorimeters were originally designed to automate the color matching process, allowing operators with limited knowledge or experience to efficiently manage colors. However, it proved difficult for operators with limited knowledge or experience to effectively use scanners and colorimeters while maintaining the balance between quality and delivery time required by customers.

[0007] This invention has been made in view of the problems in the prior art described above, and aims to provide color management that balances the required quality and delivery time. [Means for solving the problem]

[0008] To solve the above problems, the invention described in claim 1 is a color management method in which a color management device that performs color management related to an image forming engine based on data read by a reading device equipped with a colorimeter and a scanner installed on the transport path of the paper printed by the image forming engine switches between a mode in which the colorimeter moves by a first width in the paper width direction and acquires data based on a first pattern for reading all or some of the multiple patches arranged in the paper width direction and a mode in which the colorimeter stops or moves by a second width smaller than the first width in the paper width direction and acquires data based on a second pattern for reading all or some of the multiple patches arranged in the paper width direction.

[0009] The invention described in claim 2 is a color management method described in claim 1, 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 in a single process relating to the color management.

[0010] The invention described in claim 3 is a color management method described in 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, based on a ratio determined based on settings received from the user.

[0011] The invention described in claim 4 is a color management method described in claim 2, wherein the color management device acquires data based on the first pattern for a first area of ​​a sheet of paper, and acquires data based on the second pattern for a second area of ​​the sheet of paper that is different from the first area.

[0012] The invention described in claim 5 is a color management method described in claim 2, wherein the image forming engine prints patches on a plurality of sheets of paper, the color management device acquires data based on the first pattern for a first sheet of paper among the plurality of sheets, and acquires data based on the second pattern for a second sheet of paper different from the first sheet among the plurality of sheets.

[0013] The invention described in claim 6 is a color management method described in claim 1, wherein the color management device does not acquire the data read by the scanner for the first pattern.

[0014] The invention described in claim 7 is a color management method described in claim 1, wherein the color management device does not acquire data read by the colorimeter for the second pattern.

[0015] The invention described in claim 8 is the color management method described in claim 1, wherein in reading the second pattern, the colorimeter stops in the paper width direction.

[0016] The invention described in claim 9 is a color management method described in claim 1, wherein the color management device acquires data for the first pattern obtained by the colorimeter reading some of the patches among a plurality of patches arranged in the paper width direction, and the scanner acquires data obtained by the scanner reading the other patches among the plurality of patches arranged in the paper width direction other than the partial patches read by the colorimeter.

[0017] The invention described in claim 10 is a color management method described in claim 1, wherein the color management device acquires data for the second pattern obtained by the scanner reading some of the multiple patches arranged in the paper width direction, and the colorimeter acquires data obtained by the colorimeter reading the other patches among the multiple patches arranged in the paper width direction other than the some patches read by the scanner.

[0018] The invention described in claim 11 is a color management method described in claim 1, wherein the reading device corrects the data read by the scanner for the second pattern based on the data read by the colorimeter.

[0019] The invention described in claim 12 is a color management method described in claim 1, wherein the color management device performs color management based on a color management dataset, the color management device receives 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 indicated by the obtained mode setting.

[0020] The invention described in claim 13 is a color management method according to claim 12, wherein the color management dataset includes the setting of the mode, and the color management device acquires data in the mode indicated by the setting of the mode included in the set color management dataset.

[0021] The invention described in claim 14 is a color management method described in claim 1, wherein the color management is at least one of color verification, creation of a color profile, and color correction.

[0022] The invention described in claim 15 is a color management device comprising a control unit that performs the color management method described in any one of claims 1 to 14.

[0023] The invention described in claim 16 is a program for causing a computer that controls a color management device to execute the color management method described in any one of claims 1 to 14.

[0024] The invention described in claim 17 is an image forming apparatus that includes an image forming engine and is compatible with a reading device equipped with a colorimeter and a scanner, which is installed on a transport path for paper printed by the image forming engine, wherein the image forming engine prints by switching between a first pattern in which the colorimeter moves by a first width in the paper width direction and the colorimeter reads all or some of the patches of a plurality of patches arranged in the paper width direction to acquire data, and a second pattern in which the colorimeter stops or moves by a second width smaller than the first width in the paper width direction and the scanner reads all or some of the patches of a plurality of patches arranged in the paper width direction to acquire data.

[0025] The invention described in claim 18 is a reading device installed on a transport path for paper printed by an image forming engine, comprising a colorimeter and a scanner, wherein the device switches between a mode in which the colorimeter moves by a first width in the paper width direction and acquires data based on a first pattern for reading all or some of the patches among a plurality of patches arranged in the paper width direction, and a mode in which the colorimeter stops or moves by a second width smaller than the first width in the paper width direction and the scanner acquires data based on a second pattern for reading all or some of the patches among a plurality of patches arranged in the paper width direction. [Effects of the Invention]

[0026] According to the present invention, color management can be performed in accordance with the required balance between quality and delivery time. [Brief explanation of the drawing]

[0027] [Figure 1] This is a diagram illustrating the configuration of a color management system in a first embodiment of the present invention. [Figure 2] This is a diagram showing the hardware configuration of an image forming apparatus. [Figure 3] This diagram shows the hardware configuration of the reader. [Figure 4] This figure shows the external configuration of the image forming apparatus and the image reading apparatus. [Figure 5] This diagram schematically shows the positional relationship between the inline reading unit and the chart. [Figure 6] This diagram shows the hardware configuration of a PC. [Figure 7] This diagram shows the hardware configuration of the printer controller. [Figure 8] This diagram shows the hardware configuration of the color management device. [Figure 9] This figure shows an example of the data structure of a printer information table. [Figure 10] This figure shows an example of the data structure of a color management dataset table. [Figure 11] This is an example of a chart constructed using Pattern A. [Figure 12] This is an example of a chart constructed using Pattern B. [Figure 13] This is an example of a chart constructed using pattern C. [Figure 14] This is an example of a chart constructed using Pattern D. [Figure 15] This is an example of a chart composed of pattern E. [Figure 16] This is a diagram illustrating spot color measurement using a colorimeter. [Figure 17] This is a diagram illustrating line color measurement using a colorimeter. [Figure 18] This is a flowchart showing the first color management execution process. [Figure 19] This diagram shows the data structure of paper size settings information. [Figure 20]This is an example of the color measurement settings screen. [Figure 21] This is a flowchart showing the second color management execution process in the second embodiment. [Figure 22] This is an example of a screen for selecting a color management dataset. [Figure 23] This is an example of a chart that includes both accuracy-prioritizing and speed-prioritizing patterns on the same page. [Figure 24] This is an example of a multi-page chart that includes both accuracy-prioritizing and speed-prioritizing patterns. [Figure 25] This is an example of a chart consisting of multiple pages where the switching point between the accuracy-prioritizing pattern and the speed-prioritizing pattern is on the same page. [Figure 26] This is an example of a colorimetric settings screen where you can set the ratio between accuracy-prioritizing patterns and speed-prioritizing patterns. [Figure 27] This is an example of a color measurement settings screen where you can set the pattern and ratio to be used. [Figure 28] Here are examples of patch priorities. [Modes for carrying out the invention]

[0028] Embodiments of the present invention will be described below with reference to the drawings. The advantages and features provided by the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments or illustrations disclosed below.

[0029] [First Embodiment] Figure 1 shows the configuration of the color management system 100 in the first embodiment. The color management system 100 comprises a PC (Personal Computer) 10, a printer controller 20, a plurality of image forming apparatuses 30, a reader 40 corresponding to each image forming apparatus 30, and a color management device 50. Each device constituting the color management system 100 is connected via a communication network N such as a LAN (Local Area Network) to enable data communication. The number of each device is not particularly limited. The color management system 100 is used, for example, in a print shop that provides printed materials to customers. Furthermore, each image forming apparatus 30 may 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.

[0030] The PC10 has the printer driver program 121 (see Figure 6) installed. The PC10 issues print commands to the printer controller 20 or the image forming apparatus 30 using the printer driver. Specifically, the PC10 generates print data described in a page description language (PDL) or the like that can be interpreted by the printer controller 20, in response to user operations. Alternatively, the PC10 may issue print commands to the printer controller 20 or the image forming apparatus 30 for data such as PDFs using a specific application, without using the printer driver.

[0031] The printer controller 20 has the printer controller program 221 (see Figure 7) installed. The printer controller 20 receives print data from the PC 10. The printer controller 20 also receives chart data from the color management device 50. The printer controller 20 performs RIP (Raster Image Processing) on ​​the print data or chart data to generate printable image data (raster data). The printer controller 20 also performs image processing such as color conversion and screening on the printable image data. The printer controller 20 transmits the processed image data (raster data) to the image forming apparatus 30. The printer controller 20 may be built into the image forming apparatus 30. Alternatively, the printer controller 20 and the image forming apparatus 30 may be connected via a dedicated line, such as a PCI connection.

[0032] The image forming apparatus 30 forms an image on paper based on raster data (image data in bitmap format) received from the printer controller 20. The paper includes printing paper and various types of film. Paper types include plain paper, fine paper, gloss coated paper, matte coated paper, etc.

[0033] The reading device 40 is connected to the downstream side of the image forming apparatus 30 in the paper transport direction. The reading device 40 reads the paper printed by the image forming apparatus 30.

[0034] The color management device 50 has a color management application program 521 (see Figure 8) installed for managing the colors of the image forming apparatus 30. The color management device 50 performs color verification, color profile creation, color correction, history management, etc., in the image forming apparatus 30.

[0035] Figure 2 shows the hardware configuration of the image forming apparatus 30. Figure 3 shows the hardware configuration of the reading device 40. Figure 4 shows the external configuration of the image forming apparatus 30 and the reading device 40. The image forming apparatus 30 is capable of image formation using four toner colors: cyan (C), magenta (M), yellow (Y), and black (K), as well as a special color toner, white (W).

[0036] As shown in Figure 2, 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.

[0037] The CPU 31 comprehensively controls the processing operations of each part of the image forming apparatus 30. The CPU 31 reads various processing programs stored in the memory unit 32 and performs various processing operations in cooperation with those programs.

[0038] The storage unit 32 includes an HDD (Hard Disk Drive), an SSD (Solid State Drive), non-volatile memory, etc. The storage unit 32 stores various processing programs, data related to various processing, etc. For example, the storage unit 32 stores paper information related to the image forming apparatus 30. The storage unit 32 also stores target profiles, printer profiles, scanner profiles, etc.

[0039] The display unit 33 is composed of an LCD (Liquid Crystal Display). The display unit 33 displays various screens according to the instructions of the display signals input from the CPU 31. The control unit 34 receives various operations from the user and outputs operation signals based on those operations to the CPU 31. The control unit 34 includes a touchscreen, a numeric keypad, a start button, a stop button, and the like.

[0040] 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 also receives print instructions for charts, etc., from the color management device 50.

[0041] The image forming unit 36 ​​forms an image on paper using an electrophotographic method. As shown in Figure 4, the image forming unit 36 ​​includes photoreceptor drums 361C, 361M, 361Y, 361K, and 361W corresponding to cyan (C), magenta (M), yellow (Y), black (K), and white (W), an intermediate transfer belt 362, a fixing unit 363, an inversion unit 364, etc. For example, the image forming unit 36 ​​uniformly charges the photoreceptor drum 361C corresponding to cyan, and then scans and exposes the photoreceptor drum 361C with a laser beam based on cyan image data to form an electrostatic latent image. The image forming unit 36 ​​then deposits cyan toner onto the electrostatic latent image on the photoreceptor drum 361C and develops it. The processing for other colors is the same as the processing for cyan. The image forming unit 36 ​​sequentially transfers the toner images of each color formed on the photoreceptor drums 361C, 361M, 361Y, 361K, and 361W corresponding to each color onto the intermediate transfer belt 362 (primary transfer). That is, a color toner image is formed on the intermediate transfer belt 362 by superimposing the toner images of multiple colors. The image forming unit 36 ​​then transfers the color toner image on the intermediate transfer belt 362 onto the paper all at once (secondary transfer). The fixing unit 363 fixes the color toner image to the paper by heating and pressurizing. When image formation is performed on both sides of the paper, the inversion unit 364 inverts the paper with the image fixed on the front side and transports it back to the image forming unit 36. The CPU 31 controls the image forming unit 36 ​​to form the image based on the raster data received from the printer controller 20. Figure 4 shows an example of an image forming unit 36 ​​that forms an image using five toners: cyan, magenta, yellow, black, and white (CMYKW). Alternatively, the toner used in the image forming unit 36 ​​does not have to include white, and may also include spot colors other than white.

[0042] The document reading unit 37 reads the paper, color sample, etc., placed on the document glass and generates reading data having pixel values ​​for each color: red (R), green (G), and blue (B).

[0043] The paper feeding unit 38 is equipped with multiple paper trays and supplies the paper stored in each paper tray to the image forming unit 36.

[0044] As shown in Figure 3, the reading device 40 comprises a CPU 41, a storage unit 42, a communication unit 43, and an inline reading unit 44. The CPU 41 comprehensively controls the 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 those programs. The storage unit 42 includes an HDD, SSD, non-volatile memory, etc. The storage unit 42 stores various processing programs, data related to various processing, etc. The communication unit 43 performs data communication with external devices. For example, the communication unit 43 receives instructions to read charts from the color management device 50. The communication unit 43 transmits the reading data from the inline reading unit 44 to the color management device 50.

[0045] The inline reading unit 44 is located in the transport path downstream of the image forming unit 36 ​​(image forming engine) in the paper transport direction. The inline reading unit 44 reads the image formed on the paper and generates reading data. The inline reading unit 44 comprises a colorimeter 45 and a scanner 46.

[0046] Figure 5 schematically shows the positional relationship between the inline reading unit 44 and the chart 200. As the chart 200 is transported, the inline reading unit 44 becomes capable of reading different positions on the chart 200 in the paper transport direction.

[0047] The colorimeter 45 is a spectrophotometer that measures the absolute value of color (L). * a * b *Accurately measure colors (such as values, XYZ values, etc.). The colorimeter 45 detects the spectral reflectance for each wavelength with respect to an image formed on a sheet (chart 200) and measures the color of the image. There are a spot color measurement mode and a line color measurement mode for reading by the colorimeter 45.

[0048] The spot color measurement mode is a mode in which color is measured individually once for each patch. The spot color measurement mode, in terms of a camera, is an image of pressing the shutter button once for each patch. That is, in the spot color measurement mode, the colorimeter 45 reads a partial area in the sheet width direction (main scanning direction) orthogonal to the sheet conveyance direction in one reading (color measurement).

[0049] The line color measurement mode is a mode of obtaining time-series data of color measurement values by flowing and reading while moving the colorimeter 45. The line color measurement mode, in terms of a camera, is an image of moving the camera while keeping the shutter open. In the line color measurement mode, the colorimeter 45 may output the average value of the color measurement values obtained within the same patch as the reading data corresponding to the patch.

[0050] The colorimeter 45 is configured to be movable in the sheet width direction. By moving in the sheet width direction, the colorimeter 45 can read the entire sheet width direction. In other words, without moving the colorimeter 45, the colorimeter 45 can only read a partial area in the sheet width direction. Also, the colorimeter 45 is also used for correction (calibration) of the scanner 46.

[0051] The scanner 46 is fixed and can read the entire sheet width direction in one reading. The scanner 46 reads the conveyed sheet (chart 200) and generates reading data having pixel values for each of the colors red (R), green (G), and blue (B). The scanner 46 is, for example, a line-type CCD sensor. In the reading by the scanner 46, the CPU 31 calculates color measurement values (L * a * b * values, XYZ values, etc.).

[0052] The inline reading unit 44 reads two patterns (charts): a first pattern and a second pattern. The first pattern is a pattern in which the colorimeter 45 moves a first width in the paper width direction, and the colorimeter 45 reads all or some of the multiple patches arranged in the paper width direction. The first pattern is called the "accuracy priority pattern" because it is mainly read by the colorimeter 45. Compared to reading based on the second pattern, reading based on the accuracy priority pattern has higher accuracy in color measurement values, but the reading speed is slower. With reading based on the accuracy priority pattern, for example, the colorimeter 45 reads approximately 1700 patches printed on the entire surface of the paper and performs color adjustment, enabling high-precision color management.

[0053] The second pattern is one in which the colorimeter 45 stops or moves a second width smaller than the first width in the paper width direction, and the scanner 46 reads all or some of the multiple patches arranged in the paper width direction. The second pattern is called the "speed-priority pattern" because it is mainly read by the scanner 46. Reading based on the speed-priority pattern is faster than reading based on the accuracy-priority pattern, but the accuracy of the colorimetric values ​​is lower.

[0054] Note that "accuracy-prioritizing pattern" and "speed-prioritizing pattern" are relative terms. Depending on the pattern being compared, the same pattern can be both an accuracy-prioritizing pattern and a speed-prioritizing pattern.

[0055] Figure 6 shows the hardware configuration of PC10. PC10 comprises a CPU 11, a storage unit 12, a display unit 13, an operation unit 14, and a communication unit 15. The CPU 11 comprehensively controls the processing operations of each part of the PC 10. The CPU 11 reads various processing programs stored in the memory unit 12 and performs various processes in cooperation with those programs. The storage unit 12 includes an HDD, SSD, non-volatile memory, etc. The storage unit 12 stores various processing programs such as the printer driver program 121, data related to various processing, etc.

[0056] The display unit 13 is composed of an LCD. The display unit 13 displays various screens according to the instructions of the display signals input from the CPU 11. The control unit 14 includes a keyboard and a pointing device such as a mouse. The control unit 14 outputs operation signals input by key operations on the keyboard and operations on the pointing device to the CPU 11. The communication unit 15 performs data communication with external devices.

[0057] Figure 7 shows the hardware configuration of the printer controller 20. The printer controller 20 comprises a CPU 21, a storage unit 22, a display unit 23, an operation unit 24, and a communication unit 25. Since each part of the printer controller 20 is the same as each part of the PC 10, only the differences from the PC 10 will be explained. The storage unit 22 stores the printer controller program 221. The storage unit 22 also stores the target profile, printer profile, and other related information.

[0058] Figure 8 shows the hardware configuration of the color management device 50. The color management device 50 comprises a CPU 51, a storage unit 52, a display unit 53, an operation unit 54, and a communication unit 55. Since each part of the color management device 50 is the same as each part of the PC 10, the differences from the PC 10 will be explained.

[0059] The memory unit 52 stores a color management application program 521. The color management application is realized through the cooperation of the CPU 51 and the color management application program 521. The color management application provides a user interface for issuing execution instructions for color management of the image forming apparatus 30, checking color verification results, calculating correction values, etc. Note that the method of using the color management application is not limited to when the program is installed locally. Alternatively, the color management application on the cloud may be used as a SaaS (Software as a Service) type service, accessed from the color management device 50 via a browser.

[0060] The memory unit 52 stores the printer information table T1 and the color management dataset table T2.

[0061] The printer information table T1 is a table for managing printer information for multiple image forming apparatuses 30 within the color management system 100. Figure 9 shows an example of the data structure of the printer information table T1. The printer information table T1 associates the following information with each image forming apparatus 30: printer name, model name, serial number, IP address, main unit administrator password, status, installation location, communication settings, authentication settings, paper information, etc.

[0062] "Printer name" is the name of the image forming apparatus 30 (printer). "Model name" refers to the model name of the image forming apparatus 30. The "serial number" is the serial number of the image forming apparatus 30. The "IP address" is the IP address of the image forming apparatus 30. The "IP address" may also include the IP address of the image forming engine (image forming apparatus 30) and the IP address of the printer controller 20. The "main unit administrator password" is the administrator password for the image forming apparatus 30. "Status" is information indicating the state of the image forming apparatus 30. The "Status" can be either online or offline. "Installation location" refers to the installation location of the image forming apparatus 30. "Communication settings" is information indicating the communication settings of the image forming apparatus 30. "Communication settings" include SSL (ON / OFF), SSL port, and RAW printing port. "Authentication settings" is information indicating the authentication settings of the image forming apparatus 30. "Authentication settings" include authentication (ON / OFF) and public user (ON / OFF). "Paper information" refers to information about the paper used in the image forming apparatus 30. "Paper information" includes information such as the type of paper and which paper tray the paper is in. "Paper information" includes the paper tray, paper profile, paper size, paper feeding direction, paper type, paper weight, paper color, punch holes, etc.

[0063] The color management dataset table T2 is a table for managing the color management dataset (target configuration, color management target setting) used by the color management device 50 (color management application). The color management dataset includes settings for the colorimeter used for color management, settings for the chart to be used, tolerance values ​​for color verification, settings for color correction, settings for data acquisition mode, etc. The color management dataset includes various settings necessary for color measurement processing.

[0064] Figure 10 shows an example of the data structure of the color management dataset table T2. The color management dataset table T2 associates the color management dataset name, color measurement settings, profile creation settings, color verification settings, data acquisition mode, etc., with each color management dataset.

[0065] "Color management dataset name" is the name of the color management dataset. "Colorimetric settings" are settings related to color measurement. These settings include the colorimeter used, color measurement conditions, and the number of color measurement averages. When obtaining colorimetric values, multiple copies of the wedge or chart are printed to ensure print stability, and the colorimetric values ​​are averaged for each patch. "Number of colorimetric averaging cycles" is the number of wedges or charts printed for this averaging process. "Number of colorimetric averaging cycles" is a value specified by the user.

[0066] "Profile Creation Settings" are settings related to profile creation. These settings include profiling charts, UCR / GCR, and Device Link Profile (DLP) creation settings. A "profiling chart" is a chart used to create a profile (profiling). "UCR (Under Color Removal)" replaces the CMY in the shadow areas with black (K). "GCR (Gray Component Replacement)" replaces the CMY in all tonal areas, from the highlights to the shadows, with black (K). The "DLP creation settings" include RGB-CMYK DLP (RGB source profile, RGB rendering intent) and CMYK-CMYK DLP (target profile, CMYK rendering intent, midtone desaturation, solid color preservation). "Intermediate turbidity removal" is a setting that reproduces a color that was composed of only a single color before color conversion so that it remains composed of only that single color after color conversion. "Solid Color Retention" is a setting that reproduces the solid color areas from before the color conversion as solid colors after the color conversion.

[0067] "Color Verification Settings" refers to the settings related to color verification. "Color Verification Settings" include the color verification standard name, color verification wedge, calculation settings, judgment items, and tolerance values. The "Calculation Settings" include consideration of the underlying structure (absolute / relative) and the dE calculation formula (dE00, dEab, etc.). "Judgment criteria and tolerance values" are the judgment criteria and tolerance values ​​defined in the standard. These criteria and tolerance values ​​can be set strictly or loosely depending on the user's operation.

[0068] The "data acquisition mode" is a mode related to data acquisition from the reading device 40 in the color management of the image forming apparatus 30.

[0069] The CPU 51 acquires reading data from the reading device 40 via the communication unit 55, specifically from the inline reading unit 44. If the reading data is from the colorimeter 45, then L * a * b * If it is data, and if it is data read by scanner 46, then RGB data and / or L * a * b * This is data. Note that L * a * b * The values ​​may also be other values ​​that represent color, such as XYZ values ​​or density values.

[0070] The CPU 51 (control unit) performs color management related to the image forming apparatus 30 (image forming engine) based on data read by the inline reading unit 44 (reader 40) installed on the transport path of the paper printed by the image forming apparatus 30 (image forming engine). Color management consists of at least one of the following: color verification, color profile creation, and color correction. Color verification is a function that compares the actual reading results of a chart printed by the image forming apparatus 30 with the target value to verify whether or not the color verification criteria are met. The color profile creation function is a function that creates a profile that shows the color characteristics of the image forming apparatus 30. Color correction is a function that corrects the colors printed by the image forming apparatus 30.

[0071] The CPU 51 switches between a mode for acquiring data based on an accuracy-priority pattern (first pattern) and a mode for acquiring data based on a speed-priority pattern (second pattern). The data based on the accuracy-priority pattern includes not only the data directly obtained by reading the accuracy-priority pattern in the reader 40, but also data that has been processed, such as color conversion, on the data obtained by reading the accuracy-priority pattern. The same applies to the data based on the speed-priority pattern.

[0072] The vertical and horizontal dimensions of each patch (size in the paper transport direction and size in the paper width direction) shall be predetermined between the image forming apparatus 30 and the color management application. For example, the patch read by the colorimeter 45 shall be 10-20 mm x 10-20 mm, and the patch read by the scanner 46 shall be 10 mm x 10 mm, etc. Furthermore, the data acquired by the CPU 51 is stored separately as data read by the colorimeter 45 and data read by the scanner 46.

[0073] As an example of a precision-prioritizing pattern, Pattern A is a pattern in which the colorimeter 45 reads all of the multiple patches arranged in the paper width direction. Alternatively, Pattern A may include some of the multiple patches arranged in the paper width direction that the colorimeter 45 does not read.

[0074] Figure 11 shows an example of a chart 201 composed of pattern A. For pattern A, the CPU 51 of the color management device 50 performs color management using only the reading data of the colorimeter 45. The CPU 41 of the reading device 40 performs color measurement while moving the colorimeter 45 in the paper width direction so that the colorimeter 45 reads all patches on the chart 201. The colorimeter 45 targets area 201A of the chart 201 for reading. For example, the width W1 shown in Figure 11 corresponds to the "first width" in which the colorimeter 45 moves in the paper width direction when reading pattern A. Note that in Figure 11, width W1 is illustrated assuming that the colorimeter 45 reads the central position of the patch in the paper width direction. The arrow 201C in Figure 11 indicates the order in which the colorimeter 45 reads the patches. The data for each patch read by the colorimeter 45 is data obtained from the spectrophotometer. The CPU 41 of the reading device 40 acquires the data for each patch read by the colorimeter 45. The CPU 41 processes the data read by the colorimeter 45 for each patch, L * a * b * Outputs values, concentration values, wavelength characteristics, etc.

[0075] The CPU 51 of the color management device 50 processes the data (L) read by the colorimeter 45 for each patch of pattern A. * a * b * The system acquires values ​​(such as density values ​​and wavelength characteristics), but does not acquire the data read by scanner 46.

[0076] As an example of a precision-prioritizing pattern, pattern B is a pattern in which the colorimeter 45 reads some of the multiple patches arranged in the paper width direction, and the scanner 46 reads the other patches from the multiple patches arranged in the paper width direction that are not read by the colorimeter 45.

[0077] Figure 12 shows an example of a chart 202 composed of pattern B. For pattern B, the CPU 51 of the color management device 50 performs color management using reading data from both the colorimeter 45 and the scanner 46. The CPU 41 of the reading device 40 performs color measurement while moving the colorimeter 45 in the paper width direction so that the colorimeter 45 reads the patch in area 202A on the chart 202. For example, the width W2 shown in Figure 12 corresponds to the "first width" in which the colorimeter 45 moves in the paper width direction when reading pattern B. In Figure 12, the width W2 is illustrated assuming that the colorimeter 45 reads the central position of the patch in the paper width direction. The arrow 202C in Figure 12 indicates the order in which the colorimeter 45 reads the patches. The CPU 41 acquires the data for each patch read by the colorimeter 45. The CPU 41 then processes the data from the colorimeter 45 for each patch, L * a * b * Outputs values, concentration values, wavelength characteristics, etc.

[0078] The CPU 41 instructs the scanner 46 to read the patches in area 202B on chart 202. The arrow 202D in Figure 12 indicates the order in which the scanner 46 reads the patches. However, since the scanner 46 reads multiple patches aligned in the paper width direction simultaneously, regardless of whether the arrow 202D overlaps a patch in Figure 12, patches with the same position in the paper transport direction within area 202B are read simultaneously by the scanner 46. The same applies to arrows 203D, 204D, and 205D in Figures 13 to 15. The CPU 41 acquires the data for each patch read by the scanner 46. After the CPU 41 acquires the RGB values ​​as data for each patch from the scanner 46, it extracts the L from the RGB values. * a * b * Convert to a value. CPU 41 converts the data read by scanner 46 to L for each patch. * a * b * Output the value.

[0079] The CPU 51 of the color management device 50 acquires data for pattern B from the colorimeter 45 reading some of the multiple patches arranged in the paper width direction, and the scanner 46 acquires data from the other patches among the multiple patches arranged in the paper width direction that are not read by the colorimeter 45.

[0080] As an example of a speed-prioritizing pattern, pattern C is a pattern in which the scanner 46 reads some of the multiple patches arranged in the paper width direction, and the colorimeter 45 reads the other patches from the multiple patches arranged in the paper width direction that are not read by the scanner 46.

[0081] Figure 13 shows an example of a chart 203 composed of pattern C. For pattern C, the CPU 51 of the color management device 50 performs color management using reading data from both the scanner 46 and the colorimeter 45. The CPU 41 of the reading device 40 performs color measurement while moving the colorimeter 45 in the paper width direction so that the colorimeter 45 reads the patch in area 203A on the chart 203. For example, the width W3 shown in Figure 13 corresponds to the "second width" that the colorimeter 45 moves in the paper width direction when reading pattern C. Note that in Figure 13, width W3 is illustrated assuming that the colorimeter 45 reads the central position of the patch in the paper width direction. The width W3 that the colorimeter 45 moves in the paper width direction when reading pattern C is smaller than the width W1 (see Figure 11) that the colorimeter 45 moves in the paper width direction when reading pattern A. The width W3 that the colorimeter 45 moves in the paper width direction when reading pattern C is smaller than the width W2 (see Figure 12) that the colorimeter 45 moves in the paper width direction when reading pattern B. The arrow 203C in Figure 13 indicates the order in which the colorimeter 45 reads the patches. The CPU 41 causes the scanner 46 to read the patch in area 203B on chart 203. The arrow 203D in Figure 13 indicates the order in which the scanner 46 reads the patch.

[0082] The CPU 51 of the color management device 50 acquires data for pattern C from the scanner 46 reading some of the multiple patches arranged in the paper width direction, and the colorimeter 45 acquires data from the other patches among the multiple patches arranged in the paper width direction that are not read by the scanner 46.

[0083] As an example of a speed-prioritizing pattern, pattern D is a pattern in which the CPU 41 of the reading device 40 corrects the data read by the scanner 46 based on the data read by the colorimeter 45.

[0084] Figure 14 shows an example of a chart 204 composed of pattern D. For pattern D, the CPU 51 of the color management device 50 performs color management using the reading data of the scanner 46, which has been corrected based on the reading data of the colorimeter 45. The CPU 41 of the reading device 40 performs color measurement while keeping the colorimeter 45 stationary in the paper width direction so that the colorimeter 45 reads patches in area 204A on the chart 204. The arrow 204E in Figure 14 indicates the order in which the colorimeter 45 reads the patches to acquire data for scanner correction. In area 204A, the patches to be read by the colorimeter 45 are arranged in a single row in the center of the chart 204 in the paper width direction. The patches read by the colorimeter 45 are used to correct the scanner 46. The CPU 41 instructs the scanner 46 to read the patch in area 204B on the chart 204. The arrow 204D in Figure 14 indicates the order in which the scanner 46 reads the patches. On the chart 204, patches to be read by the scanner 46 are arranged to the left and right of patches to be read by the colorimeter 45.

[0085] Here, we will explain how to correct the reading data of the scanner 46 based on the reading data of the colorimeter 45. The patches read by the scanner 46 include multiple common color patches, which are the same color as the patches read by the colorimeter 45. Patches of the same color are patches formed in the image forming unit 36 ​​with the same CMYK values ​​(or CMYKW values). The CPU 41 of the reading device 40 reads the L of the common color patch read by the colorimeter 45. * a * b * Value (Measured L) * a * b * Get the value. The CPU 41 uses the scanner profile of the scanner 46 to determine the RGB values ​​of the common color patch read by the scanner 46. * a * b * The value is converted to color, and the estimated L after conversion is obtained. * a * b * Get the value. CPU41 is the measured L in each common color patch. * a * b * Value and Estimated L * a * b * Based on the difference with the value, the scanner profile of scanner 46 is corrected (calibration of scanner 46). The correction of the scanner profile corresponds to the correction of the data read by scanner 46 based on the data read by colorimeter 45. For the data read by scanner 46, CPU 41 uses the corrected scanner profile to L * a * b * The values ​​are converted and then provided to the color management device 50.

[0086] The CPU 51 of the color management device 50 acquires data read by the scanner 46 for pattern D, which has been corrected based on the data read by the colorimeter 45.

[0087] As an example of a speed-prioritizing pattern, pattern E is a pattern in which the colorimeter 45 stops moving in the paper width direction and the scanner 46 reads all of the multiple patches arranged in the paper width direction. Alternatively, pattern E may include some of the multiple patches arranged in the paper width direction that the scanner 46 does not read.

[0088] Figure 15 shows an example of a chart 205 composed of pattern E. For pattern E, the CPU 51 of the color management device 50 performs color management using only the data read by the scanner 46. The CPU 41 of the reading device 40 causes the scanner 46 to read the patches in area 205B on the chart 205. The arrow 205D in Figure 15 indicates the order in which the scanner 46 reads the patches. For pattern E, the number of patches read by the colorimeter 45 is 0. When using pattern E, no correction is made to the scanner 46's reading data based on the reading data from the colorimeter 45. The CPU 41 of the reading device 40 acquires the data of each patch read by the scanner 46. After the CPU 41 acquires the RGB values ​​as data for each patch from the scanner 46, it extracts the L from the RGB values. * a * b * Convert to a value. CPU 41 converts the data read by scanner 46 to L for each patch. * a * b * Output the value.

[0089] The CPU 51 of the color management device 50 acquires the data read by the scanner 46 for pattern E, but does not acquire the data read by the colorimeter 45.

[0090] Comparing patterns A to E in terms of the ratio of data read by the colorimeter 45 to data read by the scanner 46, pattern A has the highest ratio of data read by the colorimeter 45 among patterns A to E. Pattern E has the highest ratio of data read by the scanner 46 among patterns A to E. Patterns B, C, and D have different ratios of data read by the colorimeter 45 and data read by the scanner 46. Furthermore, among patterns A to E, pattern A has the largest number of patches read by the colorimeter 45. Pattern E has the largest number of patches read by the scanner 46 among patterns A to E.

[0091] Furthermore, if pattern D or pattern E is used as the speed-priority pattern, pattern C can also be used as the accuracy-priority pattern. Also, if pattern A is used as the accuracy-priority pattern, pattern B can also be used as the speed-priority pattern.

[0092] In charts 201-205 shown in Figures 11-15, the size of the patch read by the colorimeter 45 is larger than the size of the patch read by the scanner 46. Alternatively, the patch read by the colorimeter 45 and the patch read by the scanner 46 may be the same size.

[0093] (Color verification) Now, let's discuss color verification. The CPU 51 of the color management device 50 instructs the image forming apparatus 30, which is under color management, to print a color verification chart (patch group). The CPU 51 sends a print command for the color verification chart to the printer controller 20 via the communication unit 55. The print command for the color verification chart includes the specification of the color verification chart, the paper type, screen, number of copies, and the profile to be applied during color verification. The CPU 21 of the printer controller 20 performs RIP processing on the chart data. The CPU 21 sends a print command for the color verification chart, including the processed image data, to the image forming apparatus 30, which is under color management, via the communication unit 25. In the image forming apparatus 30, which is under color management, the CPU 31 controls the image forming unit 36 ​​to print the color verification chart.

[0094] Next, the CPU 51 of the color management device 50 instructs the reading device 40, which corresponds to the image forming apparatus 30 under color management, to read the color verification chart. The CPU 51 transmits a reading instruction for the color verification chart to the reading device 40 via the communication unit 55. In the reading device 40, the CPU 41 controls the inline reading unit 44 (colorimeter 45, scanner 46) to read the color verification chart. The CPU 51 of the color management device 50 acquires the reading data from the reading device 40 via the communication unit 55 in a data acquisition mode corresponding to the color verification chart.

[0095] Next, the CPU 51 of the color management device 50 compares the read data (colorimetric values) with the color verification standard and their respective tolerance values ​​to determine whether the colors printed by the image forming apparatus 30 meet the color verification criteria. The CPU 51 stores the determination result in the storage unit 52 and also displays the determination result on the display unit 53.

[0096] (Create a color profile) Next, we will explain how to create a color profile. The CPU 51 of the color management device 50 causes the image forming apparatus 30, which is subject to color management, to print a chart for creating a profile. Next, the CPU 51 has the reading device 40, which corresponds to the image forming apparatus 30 that is subject to color management, read the chart for profile creation. The CPU 51 acquires the read data from the reading device 40 via the communication unit 55 in a data acquisition mode corresponding to the chart for profile creation. The process for printing and reading charts is the same as for color verification, except that the target chart is different; therefore, we will omit further explanation.

[0097] For each patch included in the chart for creating the profile, the absolute value of the target color (L * a * b * The values ​​(etc.) are predetermined. The CPU 51 creates a color profile based on the difference between the reading data (colorimetric value) and the target value in each patch. For example, the CPU 51 creates a printer profile, a device link profile, etc. The CPU 51 transmits the created color profile to the image forming apparatus 30, which is subject to color management, via the communication unit 55. In the image forming apparatus 30, which is subject to color management, the CPU 31 stores the color profile in the storage unit 32.

[0098] (Color correction) Next, color correction will be explained. Color correction includes adjusting the maximum density, adjusting for unevenness in the image forming apparatus 30, and adjusting the gradation. The CPU 51 of the color management device 50 performs color correction specified by the user. The CPU 51 causes the image forming apparatus 30, which is responsible for color management, to print a color correction chart. Next, the CPU 51 has the reading device 40, which corresponds to the image forming apparatus 30 that is subject to color management, read the color correction chart. The CPU 51 acquires the read data from the reading device 40 via the communication unit 55 in a data acquisition mode corresponding to the color correction chart. The process for printing and reading charts is the same as for color verification, except that the target chart is different, so we will omit the detailed explanation. Regarding chart printing, if processing by the printer controller 20 is not required, the color management device 50 can directly send a print command for the chart to the color-managed image forming apparatus 30.

[0099] For example, in the case of maximum density adjustment, the CPU 51 displays the measurement result of the maximum density and the comparison result with a predetermined target value for each CMYK (or CMYKW) color on the display unit 53. The CPU 51 accepts input of the adjustment value related to the maximum density from the user's operation unit 54. Alternatively, the CPU 51 may automatically calculate the adjustment value related to the maximum density based on the measurement result and the target value. The CPU 51 transmits the adjustment value related to the maximum density to the image forming apparatus 30 that is subject to color management via the communication unit 55. In the image forming apparatus 30, which is subject to color management, the CPU 31 stores the adjustment value related to the maximum density in the storage unit 32.

[0100] (Color matching against color samples) Next, we will explain color matching with color samples. The CPU 51 of the color management device 50 creates (modifies) a target profile used to match the color of the printed material produced by the image forming apparatus 30 to the color of a color sample (target output). The CPU 51 provides the created target profile to the image forming apparatus 30. The color sample is an output received from the customer at the time of submission, and is an actual output, not data. The target profile is created by inputting the original image data (CMYK values) of the color sample into the target printing press and the colorimetric values ​​(L) obtained from the color sample. * a * b * This represents the correspondence with the value.

[0101] CPU51 acquires the original image data (CMYK values) corresponding to the color sample. The original image data is the image data that was used as the basis for printing the color sample, and is the data submitted by the customer.

[0102] The CPU 51 acquires scanned image data (RGB values) obtained by the document reading unit 37 of the image forming apparatus 30 reading the color sample. The CPU 51 uses a pre-prepared scanner profile for the document reading unit 37 to convert the RGB values ​​of the scanned image data to L * a * b * Convert to a value. Note that the scanner profile of the document reading unit 37 is assumed to be reliable. The CPU 51 also obtains the measured color value (L) for the color sample from a colorimeter connected to the color management device 50. * a * b * You may also retrieve the value.

[0103] The CPU 51 of the color management device 50 calculates the CMYK values ​​and L for corresponding positions in the original image data and the scanned image data. * a * b * A table is created that maps values ​​to each other. CPU51 uses this table to create a target profile to match the color of the color swatch. By combining the creation of a target profile and the creation of a printer profile, the color of the printed material produced by the image forming apparatus 30 can be matched to the color of a color sample.

[0104] (Regarding the operation of the colorimeter) Next, we will provide a supplementary explanation regarding the operation of the colorimeter 45 in the reading device 40. For reading by the colorimeter 45, movement of the colorimeter 45 in the paper width direction is required. First, let's explain the spot colorimetric mode. Spot colorimetric mode is an operating mode in which colorimetric measurements are performed one patch at a time.

[0105] Figure 16 is a magnified view of a portion of the patch read by the colorimeter 45 on chart 203, which is composed of pattern C (see Figure 13). In Figure 16, the paper width direction is shown as the x-axis direction, and the paper transport direction is shown as the y-axis direction. Here, we assume that the patch read by the colorimeter 45 is composed of 20mm x 20mm. Furthermore, we assume that the gap in the paper width direction of the patch read by the colorimeter 45 is 0.5mm.

[0106] In the x-axis direction, the CPU 41 of the reading device 40 aligns the colorimeter 45 with the patch by moving the colorimeter 45 in the paper width direction. In the y-axis direction, the CPU 41 aligns the colorimeter 45 with the patch by transporting the paper. Specifically, the CPU 41 moves the colorimeter 45 in the paper width direction and places it in a waiting position at the center of patch P1 in the x-axis direction. Next, the CPU 41 transports the paper and stops transporting the paper when the colorimeter 45 is at the center of patch P1 in the y-axis direction. In this way, the CPU 41 sets the colorimeter 45 at the measurement start position of patch P1.

[0107] The process after the start of measurement is as follows: (1) The CPU 41 has the colorimeter 45 measure patch P1 and acquire the data. (2) The CPU 41 moves the colorimeter 45 in the +x direction by 20.5 mm, which is the width of the patch plus the gap of 0.5 mm. (3) The CPU 41 has the colorimeter 45 measure patch P2 and acquire data. (4) The CPU 41 transports the paper 20 mm in the y-axis direction, equal to the vertical width of the patch, and then stops it. (5) The CPU 41 has the colorimeter 45 measure patch P4 and acquire the data. (6) The CPU 41 moves the colorimeter 45 in the -x direction by 20.5 mm, which is the width of the patch plus the gap of 0.5 mm. (7) The CPU 41 has the colorimeter 45 measure patch P3 and acquire the data. (8) The CPU 41 transports the paper 20 mm in the y-axis direction, equal to the vertical width of the patch, and then stops it. (9) The CPU 41 has the colorimeter 45 measure patch P5 and acquire the data. The CPU 41 controls the color measurement by the colorimeter 45 by repeating the same process.

[0108] Figure 16 shows an example where two patches read by the colorimeter 45 are arranged side by side in the paper width direction, but the same applies when there are three or more patches arranged side by side in the paper width direction.

[0109] Next, the line measurement mode will be explained. Line measurement mode is an operating mode in which the colorimeter 45 measures the color of one line at a time. When measuring the color of one line at a time, for example, the CPU 41 will determine if the color difference between the measured patches is greater than or equal to a threshold, and will identify them as different patches. The CPU 41 will also identify different patches by recognizing gaps (boundaries) between them. The gap is defined for each colorimeter 45 and may be, for example, a white or black line with a width of 0.5 mm.

[0110] Figure 17 is a magnified view of a portion of the patches read by the colorimeter 45 on chart 203, which is composed of pattern C. In Figure 17 as well, the paper width direction is shown as the x-axis direction and the paper transport direction as the y-axis direction. Here, we assume that the patch read by the colorimeter 45 is composed of 20mm x 20mm. Furthermore, we assume that the gap in the paper width direction of the patch read by the colorimeter 45 is 0.5mm.

[0111] In line color measurement mode, the CPU 41 starts measuring color from the paper background using the colorimeter 45 and moves the colorimeter 45 in the paper width direction. The CPU 41 passes the colorimeter 45 over patches arranged in the x-axis direction and ends the color measurement at the paper background, thereby acquiring one line of color measurement data. The paper background is the part of the paper itself where no patches are printed. One line of color measurement data is time-series data of the measured color values. Specifically, the target of color measurement by the colorimeter 45 changes from the starting paper background, patch, gap, patch, gap, ..., to the ending paper background. The CPU 41 removes the measured color values ​​corresponding to the paper background and gap from one line of color measurement data to acquire the measured color values ​​for each patch.

[0112] CPU 41 moves the colorimeter 45 in the paper width direction to position it in the paper background, setting it at a position 18 mm in the -x direction from the center of patch P11 in the x-axis direction. 18 mm is half the width of one patch plus 8 mm. In the y-axis direction, the CPU 41 transports the paper and stops transporting it when the colorimeter 45 is at the center position of patch P11 in the y-axis direction. In this way, the CPU 41 sets the colorimeter 45 to the measurement start position Q1.

[0113] The travel distance of the colorimeter 45 in the paper width direction per line is 56.5 mm (18 mm + 20 mm + 0.5 mm + 18 mm), taking into account the gap and the paper substrate before and after measurement. When starting the measurement from the paper substrate, the process is as follows: (1) The CPU 41 moves the colorimeter 45 56.5 mm in the +x direction and acquires one line of color measurement data. (2) The CPU 41 obtains the data for patch P11 and patch P12 from one line of color measurement data. (3) The CPU 41 transports the paper 20 mm in the y-axis direction, equal to the vertical width of the patch, and then stops it. (4) The CPU 41 moves the colorimeter 45 56.5 mm in the -x direction and acquires one line of color measurement data. (5) The CPU 41 obtains the data for patch P14 and patch P13 from one line of color measurement data. (6) The CPU 41 transports the paper 20 mm in the y-axis direction, equal to the vertical width of the patch, and then stops it. (7) The CPU 41 moves the colorimeter 45 56.5 mm in the +x direction and acquires one line of color measurement data. (8) The CPU 41 obtains the data for patch P15 and patch P16 from one line of color measurement data. The CPU 41 controls the color measurement by the colorimeter 45 by repeating the same process.

[0114] Furthermore, if the number of patches from which data (colorimetric values) can be obtained from a single line of colorimetric data is less than the number of patches at the time the reading operation was determined, the CPU 41 may reverse the colorimeter 45 to the same line again and attempt to obtain patch data again. For example, if only one patch of data is acquired in step (5) above, the CPU 41 will perform the following processing without proceeding to the next step (6) of paper transport. The CPU 41 moves the colorimeter 45 56.5 mm in the +x direction while acquiring one line of color measurement data. CPU41 obtains data for patches P13 and P14 from a single line of color measurement data. From this point onward, the ±x direction is reversed when it comes to the movement of the colorimeter 45 in the paper width direction.

[0115] Figure 17 shows an example where two patches read by the colorimeter 45 are arranged in the width direction of the paper, but the same applies when there are three or more patches arranged in the width direction of the paper.

[0116] Line color measurement using the colorimeter 45 is available if there are two or more patches aligned in the paper width direction. If there are gaps between the patches in the chart, both spot color measurement and line color measurement are possible. In the following description, the color measurement using the colorimeter 45 may be either spot color measurement or line color measurement. The CPU 41 of the reading device 40 may automatically determine which color measurement method is faster and select the one with the shorter processing time. For example, it is preferable for the CPU 41 to select line color measurement for pattern A.

[0117] Next, the operation of the color management system 100 in the first embodiment will be described. Figure 18 is a flowchart showing the first color management execution process performed in the color management device 50.

[0118] First, the CPU 51 accepts the selection of the image forming apparatus 30 to be color-controlled (step S1). The user selects the image forming apparatus 30 by operating the control unit 54. Next, the CPU 51 accepts the selection of a color management function (step S2). The user selects a color management function by operating the control unit 54. As a color management function, one or more of the following can be selected: color verification, color profile creation, color correction.

[0119] Next, CPU 51 accepts the paper print settings (step S3). Figure 19 shows the data structure of the paper printing settings information set in step S3. "Paper print settings information" includes paper information for the paper to be color-managed, and print settings. "Paper information" includes the paper tray, paper profile, paper size, paper feeding direction, paper type, paper weight, paper color, and punch holes. "Print settings" include screen settings, number of copies (number of color averaging cycles), and the profile applied during color verification (DLP / target profile), etc. The user configures various items regarding paper information for the paper to be color-managed and print settings via the operation unit 54.

[0120] Next, the CPU 51 accepts the selection of a pattern (chart) to be used for color management (step S4). The CPU 51 displays the color measurement setting screen 60 shown in Figure 20 on the display unit 53. The color measurement setting screen 60 includes a pattern selection field 61, a colorimeter display field 62, a color measurement condition selection field 63, a color measurement averaging count input field 64, a processing time display field 65, etc. The pattern selection field 61 is an area for selecting one of the pre-registered patterns (charts). Here, patterns A through E are displayed as a pull-down menu, allowing you to select any of them. The colorimeter display area 62 displays the colorimeter corresponding to the pattern selected in the pattern selection area 61. The color measurement condition selection field 63 is an area for selecting color measurement conditions. The input field 64 for the number of colorimetric averaging operations is an area for entering the number of colorimetric averaging operations. The processing time display area 65 shows the processing time for color management corresponding to the pattern selected in the pattern selection area 61. The user selects the pattern to be used for color management in the pattern selection field 61 of the color measurement setting screen 60 by operating from the control unit 54.

[0121] Next, the CPU 51 determines the data acquisition mode according to the selected pattern (step S5). For example, if pattern A is selected, the CPU 51 will then acquire data from the reader 40 in a mode that acquires data based on pattern A (data acquisition mode).

[0122] Next, the CPU 51 accepts the settings for each item that constitutes the color management dataset (step S6). For example, the user sets each item in the color measurement condition selection field 63, the color measurement averaging count input field 64, etc., on the color measurement setting screen 60 by operating from the operation unit 54. Although not shown in Figure 20, each item included in the color management dataset table T2 (see Figure 10) can be set.

[0123] Next, the CPU 51 transmits a print command for the chart to the printer controller 20 or the image forming apparatus 30 via the communication unit 55 (step S7). Specifically, the CPU 51 transmits the following data to the image forming apparatus 30 as chart-related data: a color management dataset, paper print setting information, and chart information. The color management dataset is the information set in step S6. The paper print setting information is the information set in step S3. The chart information is information indicating the chart corresponding to the pattern selected in step S4. Image data, CGATS data, etc., can be used as chart information.

[0124] The CPU 31 of the image forming apparatus 30 controls the image forming unit 36 ​​to print the chart. Specifically, the CPU 31 causes the image forming unit 36 ​​to print the chart according to the paper printing setting information. The CPU 31 transports the printed paper (chart) to the reading device 40. Based on the color measurement settings included in the color management dataset and the chart information, the CPU 31 determines the areas to be read by the colorimeter 45 and the areas to be read by the scanner 46 within the chart, and determines the number of patches in each area. Based on the areas to be read by the colorimeter 45, the areas to be read by the scanner 46, and the number of patches in each area, the CPU 31 determines the reading operation of the colorimeter 45 and scanner 46 in the reading device 40. The CPU 31 transmits information indicating the reading operation to the reading device 40 via the communication unit 35.

[0125] Next, the CPU 51 of the color management device 50 transmits a chart reading instruction to the reading device 40 via the communication unit 55 (step S8). The CPU 41 of the reading device 40 controls the inline reading unit 44 to read the chart. Based on the chart reading instruction received from the color management device 50 and the reading operation information received from the image forming apparatus 30, the CPU 41 controls the reading of the chart by the colorimeter 45 and the scanner 46.

[0126] The CPU 51 of the color management device 50 acquires the data read by the reading device 40 from the reading device 40 via the communication unit 55 in the determined data acquisition mode (step S9). 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 of the color management are as described above. This completes the execution of the first color management process.

[0127] In the color measurement setting screen 60 shown in Figure 20, the case where a pattern (chart) selection is accepted in the pattern selection field 61 has been explained. Alternatively, the CPU 51 may accept the selection of the data acquisition mode in the color management device 50 and automatically select a pattern corresponding to the data acquisition mode.

[0128] According to the first embodiment, the CPU 51 of the color management device 50 switches between a mode for acquiring data based on an accuracy-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 in accordance with the balance between the required quality and delivery date.

[0129] In recent years, with advances in image formation technology, the variations in image formation processes have increased, including printing using spot color toners, decorative printing, and printing on special papers. For example, in cases where an image is formed using CMYK toners on top of white toner, or where a gray image is formed using only CMY toners without using K toner (black toner), the accuracy of the color measurement values ​​by the scanner 46 may decrease. In such situations, the present invention is particularly effective.

[0130] For example, in the mode where data is acquired based on pattern A (see Figure 11), the CPU 51 performs color management using only the data read by the colorimeter 45. Therefore, the CPU 51 can perform color management with high accuracy.

[0131] In the mode for acquiring data based on pattern E (see Figure 15), the CPU 51 performs color management using only the data read by the scanner 46. Therefore, the CPU 51 can reduce the time required to read the chart and perform color management at high speed.

[0132] In the mode for acquiring data based on pattern B (see Figure 12) and the mode for acquiring data based on pattern C (see Figure 13), the CPU 51 performs color management using data read by both the colorimeter 45 and the scanner 46. Therefore, the CPU 51 can perform color management while balancing accuracy and speed.

[0133] In the mode for acquiring data based on pattern D (see Figure 14), the CPU 51 performs color management using data read by the scanner 46, which has been corrected based on the data read by the colorimeter 45. By using data read by the scanner 46, which has been corrected based on the data read by the colorimeter 45, the CPU 51 can ensure accuracy in color management.

[0134] Furthermore, in the reading device 40, when reading a chart corresponding to pattern D or pattern E, the colorimeter 45 does not move in the paper width direction, thus reducing the time required to read the chart.

[0135] In the first embodiment, the CPU 31 of the image forming apparatus 30 determines the area to be read by the colorimeter 45, the area to be read by the scanner 46, and the number of patches in each area within the chart. Alternatively, the CPU 51 of the color management device 50 may transmit information including the area to be read by the colorimeter 45, the area to be read by the scanner 46, and the number of patches in each area within the chart to the reading device 40 via the communication unit 55.

[0136] [Second Embodiment] Next, a second embodiment to which the present invention is applied will be described. Since the color management system in the second embodiment has the same configuration as the color management system 100 shown in the first embodiment, the same reference numerals are used for the same components as in the first embodiment, and their descriptions are omitted. The configurations and processes characteristic of the second embodiment will be described below.

[0137] The CPU 51 of the color management device 50 performs color management based on the color management dataset. CPU51 accepts the configuration of the color management dataset. CPU51 retrieves the setting for the mode (data acquisition mode) corresponding to the configured color management dataset. CPU51 acquires data in the mode indicated by the acquired mode setting.

[0138] Specifically, CPU51 acquires data in the mode indicated by the mode setting included in the configured color management dataset.

[0139] Next, the operation of the color management system 100 in the second embodiment will be described. Figure 21 is a flowchart showing the second color management execution process performed in the color management device 50. The processing in steps S11 to S13 is the same as the processing in steps S1 to S3 in the first color management execution process (see Figure 18), so the explanation is omitted.

[0140] Next, the CPU 51 accepts the setting of the color management dataset (step S14). The CPU 51 displays the color management dataset selection screen 70 shown in Figure 22 on the display unit 53. The color management dataset selection screen 70 includes a color management dataset selection field 71, a colorimeter display field 72, a data acquisition mode display field 73, a color measurement condition display field 74, a color measurement averaging count display field 75, a processing time display field 76, etc. The color management dataset selection field 71 is an area for selecting one of the color management datasets (target configurations) registered in the color management dataset table T2 (see Figure 10). The colorimeter display area 72, data acquisition mode display area 73, color measurement condition display area 74, and color measurement averaging count display area 75 each display the various settings included in the color management dataset selected in the color management dataset selection area 71. The processing time display area 76 shows the processing time related to color management corresponding to the data acquisition mode displayed in the data acquisition mode display area 73.

[0141] In the color management dataset selection field 71 of the color management dataset selection screen 70, the user sets one of the color management datasets by operating from the operation unit 54. The CPU 51 determines the data acquisition mode corresponding to the configured color management dataset (step S15). Specifically, the CPU 51 refers to the color management dataset table T2 and obtains the data acquisition mode settings included in the configured color management dataset.

[0142] Next, CPU51 selects a chart (pattern) included in the configured color management dataset. Specifically, CPU51 refers to the color management dataset table T2 to retrieve the profiling chart and color verification wedge included in the configured color management dataset.

[0143] Next, the CPU 51 transmits a print command for the chart to the printer controller 20 or the image forming apparatus 30 via the communication unit 55 (step S17). Specifically, the CPU 51 transmits the following data to the image forming apparatus 30 as chart-related data: a color management dataset, paper print setting information, and chart information. The color management dataset is the information set in step S14. The paper print setting information is the information set in step S13. The chart information is information indicating the chart selected in step S16. Image data, CGATS data, etc., can be used as chart information.

[0144] The printing of the chart in the image forming apparatus 30 is the same as the first color management execution process. Furthermore, the processing in steps S18 to S20 is the same as the processing in steps S8 to S10 in the first color management execution process, so the explanation will be omitted. This completes the execution process for the second color management.

[0145] According to the second embodiment, the CPU 51 of the color management device 50 can perform color management in accordance with the balance between the required quality and delivery date, similar to the first embodiment.

[0146] Furthermore, the CPU 51 accepts the settings for the color management dataset and obtains the mode settings corresponding to the configured color management dataset. Specifically, the CPU 51 obtains the data acquisition mode settings included in the configured color management dataset. Therefore, the CPU 51 can obtain the data acquisition mode settings according to the color management dataset settings without requiring the operator to make complex judgments.

[0147] In the second embodiment, the case in which the data acquisition mode setting is included in the color management dataset was described. The data acquisition mode setting does not need to be included in the color management dataset; it may be managed as separate data from the color management dataset. It is sufficient that the CPU 51 of the color management device 50 can identify the data acquisition mode setting corresponding to the color management dataset when acquiring the data acquisition mode setting.

[0148] [Third Embodiment] Next, a third embodiment to which the present invention is applied will be described. The color management system in the third embodiment has the same configuration as the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used for the same components as in the first embodiment, and their descriptions are omitted. The configurations and processes characteristic of the third embodiment will be described below.

[0149] The CPU 51 of the color management device 50 switches between a mode for acquiring data based on an accuracy-priority pattern (first pattern) and a mode for acquiring data based on a speed-priority pattern (second pattern) within a single color management process. For example, the CPU 51 switches the data acquisition mode within a single process in processes such as color verification, color profile creation, and color correction.

[0150] CPU51 switches between a mode that acquires data based on an accuracy-priority pattern and a mode that acquires data based on a speed-priority pattern, based on a ratio determined based on settings received from the user.

[0151] The CPU 51 acquires data based on an accuracy-prioritizing pattern for a first area of ​​a single sheet of paper, and acquires data based on a speed-prioritizing pattern for a second area of ​​the same sheet of paper that is different from the first area. In other words, a single color management chart printed by the image forming apparatus 30 includes an area where the accuracy-prioritizing pattern is printed and an area where the speed-prioritizing pattern is printed.

[0152] Figure 23 shows an example of Chart 206, which includes both an accuracy-prioritizing pattern and a speed-prioritizing pattern on the same page. Chart 206 includes area PA, on which pattern A (see Figure 11) is printed, and area PD, on which pattern D (see Figure 14) is printed. Area PD includes area PD1, on which the colorimeter 45 reads, and area PD2, on which the scanner 46 reads.

[0153] The CPU 41 of the reading device 40 performs color measurement while keeping the colorimeter 45 stopped in the paper width direction so that the colorimeter 45 reads the patches in area PD1 on the chart 206. Arrow 206E in Figure 23 indicates the order in which the colorimeter 45 reads the patches to acquire data for scanner correction. The CPU 41 causes the scanner 46 to read the patches in area PD2 on the chart 206. Arrow 206D in Figure 23 indicates the order in which the scanner 46 reads the patches. Note that regardless of whether arrow 206D overlaps with a patch in Figure 23, patches with the same position in the paper transport direction within area PD2 are read simultaneously by the scanner 46. The CPU 51 of the color management device 50 acquires data based on pattern D from the reading device 40 for area PD of the chart 206. Specifically, the CPU 51 acquires the scanner 46 reading data corrected based on the reading data of the colorimeter 45.

[0154] The CPU 41 of the reading device 40 performs color measurement while moving the colorimeter 45 in the paper width direction so that the colorimeter 45 reads patches in area PA on the chart 206. The arrow 206C in Figure 23 indicates the order in which the colorimeter 45 reads the patches. The CPU 51 of the color management device 50 acquires data based on pattern A from the reading device 40 for area PA on the chart 206. In the example shown in Figure 23, the CPU 51 of the color management device 50 switches the data acquisition mode within a single sheet of paper.

[0155] The image forming apparatus 30 (image forming engine) may print the patch onto multiple sheets of paper. The CPU 51 of the color management device 50 acquires data based on an accuracy-prioritizing pattern for a first sheet of paper among multiple sheets, and acquires data based on a speed-prioritizing pattern for a second sheet of paper that is different from the first sheet among multiple sheets.

[0156] Figure 24 shows an example of charts 2071-2074, which consist of multiple pages, containing both accuracy-prioritizing and speed-prioritizing patterns. Chart 2071 on the first page and chart 2072 on the second page contain area PD with pattern D (see Figure 14) printed on it. Chart 2073 on the third page and chart 2074 on the fourth page contain area PA with pattern A (see Figure 11) printed on it.

[0157] The reading control by the reader device 40 for each region PD and PA is the same as in the case of Chart 206 (see Figure 23). CPU 51 acquires data for charts 2071 and 2072 from among multiple sheets of paper based on pattern D (speed-prioritizing pattern). CPU 51 also acquires data for charts 2073 and 2074 from among multiple sheets of paper based on pattern A (accuracy-prioritizing pattern). In the example shown in Figure 24, the CPU 51 of the color management device 50 switches the data acquisition mode between pages.

[0158] Furthermore, for charts consisting of multiple pages, it is acceptable to have a mix of switching data acquisition modes within the same page and switching data acquisition modes between pages. Figure 25 shows an example in charts 2081-2084, which consist of multiple pages, where the switching point between the accuracy-prioritizing pattern and the speed-prioritizing pattern is on the same page. Chart 2081 on the first page and chart 2082 on the second page contain area PD printed with pattern D (see Figure 14). Chart 2083 on the third page contains area PD printed with pattern D and area PA printed with pattern A (see Figure 11). Chart 2084 on the fourth page contains area PA printed with pattern A.

[0159] The reading control by the reader device 40 for each region PD and PA is the same as in the case of Chart 206 (see Figure 23). The CPU 51 of the color management device 50 acquires data based on pattern D (speed-priority pattern) for charts 2081 and 2082. The CPU 51 acquires data based on pattern D for area PD of chart 2083, and data based on pattern A (accuracy-priority pattern) for area PA of chart 2083. The CPU 51 acquires data based on pattern A for chart 2084. In the example shown in Figure 25, the CPU 51 of the color management device 50 switches the data acquisition mode midway through the third page. If the pattern switching position according to the ratio specified by the user does not coincide with the page boundaries, the CPU 51 mixes pattern D and pattern A at the boundary page. For all other pages, either pattern D or pattern A is used on a page-by-page basis.

[0160] Here, we will explain how to set the ratio between the accuracy-prioritizing pattern and the speed-prioritizing pattern. For example, in step S4 of the first color management execution process (see Figure 18), when the user selects the pattern to be used for color management, the ratio between the accuracy-prioritizing pattern and the speed-prioritizing pattern may be made continuously changeable.

[0161] Figure 26 shows an example of the color measurement setting screen 80 displayed on the display unit 53. The color measurement setting screen 80 includes a slider 81 for adjusting the pattern ratio, a colorimeter display field 82, a color measurement condition selection field 83, a color measurement averaging count input field 84, a processing time display field 85, and the like. The user changes the ratio of accuracy priority to speed priority in the pattern (chart) by moving the slider 81 left or right via the control unit 54. For example, the user can adjust the ratio of accuracy priority to speed priority to 30% and speed priority to 70%. The CPU 51 selects a pattern from a predetermined set of patterns according to the accuracy priority to speed priority ratio, based on the position of the slider 81. Alternatively, the CPU 51 may generate a pattern according to the accuracy priority to speed priority ratio, based on the position of the slider 81. The colorimeter display area 82, the color measurement condition selection area 83, the number of color measurement averaging input area 84, and the processing time display area 85 are the same as those shown in Figure 20: the colorimeter display area 62, the color measurement condition selection area 63, the number of color measurement averaging input area 64, and the processing time display area 65, respectively.

[0162] Furthermore, when a user selects a pattern to use for color management, they may choose from multiple patterns (charts) and continuously change the ratio in which the selected patterns are used.

[0163] Figure 27 shows an example of the color measurement setting screen 90 displayed on the display unit 53. The color measurement setting screen 90 includes a pattern selection field 91, a slider 92 for adjusting the pattern ratio, a colorimeter display field 93, a color measurement condition selection field 94, a color measurement averaging count input field 95, a processing time display field 96, and the like. The pattern selection area 91 is an area for selecting the pattern to use. For example, patterns with different ratios of data read by the colorimeter 45 and data read by the scanner 46 are pre-configured. In the example in Figure 27, patterns A and E are selected in the pattern selection area 91. The slider 92 is used to adjust the usage ratio of the pattern selected in the pattern selection field 91. The user changes the ratio of the selected pattern by moving the slider 92 left or right via the control unit 54. The colorimeter display area 93, color measurement condition selection area 94, color measurement averaging count input area 95, and processing time display area 96 are the same as the colorimeter display area 62, color measurement condition selection area 63, color measurement averaging count input area 64, and processing time display area 65 shown in Figure 20, respectively.

[0164] Furthermore, the pattern that makes up the chart may be made to allow continuous changes between the patch read by the colorimeter 45 and the patch read by the scanner 46. Figure 28 shows an example of the priority levels for each patch included in the color management chart. Figure 28 shows the correspondence between the combination of CMYK values ​​that make up the color of a patch and its priority level. For example, when the CPU 51 of the color management device 50 changes the pattern configuration according to the ratio set by the user, it generates a pattern so that the scanner 46 reads the patches in order from highest priority.

[0165] According to the third embodiment, the CPU 51 of the color management device 50 can perform color management in accordance with the balance between the required quality and delivery date, similar to the first embodiment.

[0166] Furthermore, CPU 51 switches the data acquisition mode during a color management process. This allows CPU 51 to flexibly handle cases where the chart used for color management contains both accuracy-prioritizing patterns (first pattern) and speed-prioritizing patterns (second pattern).

[0167] Furthermore, the CPU 51 switches between a mode for acquiring data based on an accuracy-prioritizing pattern and a mode for acquiring data based on a speed-prioritizing pattern, based on a ratio determined based on settings received from the user. For example, in the color measurement setting screen 80 shown in Figure 26, the user can adjust the ratio of accuracy priority to speed priority by moving the slider 81 left or right. Also, in the color measurement setting screen 90 shown in Figure 27, the user can select the pattern to use in the pattern selection field 91, and adjust the ratio of the selected pattern by moving the slider 92 left or right.

[0168] Furthermore, if a single sheet of paper contains both a precision-prioritized pattern and a speed-prioritized pattern, the CPU 51 can switch the data acquisition mode for each area within the paper. Furthermore, in the case of a chart consisting of multiple sheets of paper, if either an accuracy-prioritizing pattern or a speed-prioritizing pattern is set for each sheet, the CPU 51 can switch the data acquisition mode for each sheet.

[0169] [Fourth Embodiment] Next, a fourth embodiment to which the present invention is applied will be described. The color management system in the fourth embodiment has the same configuration as the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used for the same components as in the first embodiment, and their descriptions are omitted. The configurations and processes characteristic of the fourth embodiment will be described below.

[0170] In the first to third embodiments, the case in which the CPU 51 of the color management device 50 switches the "data acquisition mode" to acquire data based on the patterns included in the chart was described. In the fourth embodiment, the image forming apparatus 30 prints by switching between an accuracy-prioritizing pattern (first pattern) and a speed-prioritizing pattern (second pattern) for the color management of the image forming apparatus 30. Color management is at least one of the following: color verification, color profile creation, and color correction.

[0171] 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 installed on the transport path of the paper printed by the image forming unit 36 ​​and includes a colorimeter 45 and a scanner 46. The CPU 31 of the image forming apparatus 30 switches between a precision-prioritizing pattern (first pattern) and a speed-prioritizing pattern (second pattern) for printing. The information necessary for printing the precision-prioritizing pattern and the speed-prioritizing pattern may be pre-stored in the memory unit 32 of the image forming apparatus 30, or it may be obtained from the color management device 50. Furthermore, the functions of the color management device 50 shown in the first to third embodiments may be incorporated into the image forming apparatus 30.

[0172] The accuracy-prioritizing pattern is a pattern in which the colorimeter 45 moves a first width in the paper width direction, and the colorimeter 45 reads all or some of the patches among multiple patches arranged in the paper width direction to acquire data. The speed-priority pattern is a pattern in which the colorimeter 45 stops or moves a second width smaller than the first width in the paper width direction, and the scanner 46 reads all or some of the patches of multiple patches arranged in the paper width direction to acquire data.

[0173] The CPU 31 switches between a mode for printing a pattern prioritizing accuracy and a mode for printing a pattern prioritizing speed, as part of a color management process for the image forming apparatus 30.

[0174] The CPU31 switches between a mode for printing accuracy-priority patterns and a mode for printing speed-priority patterns based on a ratio determined based on settings received from the user. For example, the CPU31 adjusts the ratio of accuracy-priority patterns to speed-priority patterns in a chart used for color management based on a ratio determined based on settings received from the user.

[0175] The CPU 31 may print a precision-prioritizing pattern in a first area of ​​a single sheet of paper, and a speed-prioritizing pattern in a second area of ​​the same sheet of paper that is different from the first area.

[0176] The CPU 31 controls the image forming unit 36 ​​(image forming engine) to print patches onto multiple sheets of paper as a color management chart. The CPU 31 may print a precision-prioritized pattern on a first sheet of paper from among multiple sheets, and print a speed-prioritized pattern on a second sheet of paper that is different from the first sheet.

[0177] The CPU 31 does not need to print the area read by the scanner 46 of the reading device 40 as a precision priority pattern. The CPU 31 does not need to print the area read by the colorimeter 45 of the reader 40 as a speed-priority pattern. In reading a speed-priority pattern, the colorimeter 45 of the reading device 40 may be stopped in the paper width direction.

[0178] The CPU 31 prints multiple patches arranged in the paper width direction as a precision priority pattern. Some of the patches are read by the colorimeter 45, and the other patches, excluding those read by the colorimeter 45, are read by the scanner 46.

[0179] The CPU 31 prints multiple patches arranged in the paper width direction as a speed-priority pattern. Some of the multiple patches are read by the scanner 46, and the other patches not read by the scanner 46 are read by the colorimeter 45.

[0180] The CPU 31 may, as a speed-priority pattern, print the area read by the colorimeter 45, which is used to correct the data read by the scanner 46.

[0181] According to the fourth embodiment, the CPU 31 of the image forming apparatus 30 switches between a precision-prioritizing pattern (first pattern) and a speed-prioritizing pattern (second pattern) for printing the pattern (chart) used for color management of the image forming apparatus 30. Therefore, the CPU 51 of the color management device 50 can perform color management in accordance with the balance between the required quality and delivery time.

[0182] [Fifth Embodiment] Next, a fifth embodiment to which the present invention is applied will be described. The color management system in the fifth embodiment has the same configuration as the color management system 100 shown in the first embodiment. Therefore, the same reference numerals are used for the same components as in the first embodiment, and their descriptions are omitted. The configurations and processes characteristic of the fifth embodiment will be described below.

[0183] In the first to third embodiments, the case in which the CPU 51 of the color management device 50 switches the "data acquisition mode" to acquire data based on patterns included in the chart was described. In the fifth embodiment, the reading device 40 switches the data reading mode used for color management of the image forming apparatus 30. Color management is at least one of the following: color verification, color profile creation, and color correction.

[0184] The reading device 40 is installed on the transport path of the paper printed by the image forming unit 36 ​​(image forming engine) of the image forming apparatus 30. The reading device 40 comprises a colorimeter 45 and a scanner 46. The CPU 41 of the reading device 40 switches between a mode for acquiring data based on an accuracy-prioritizing pattern (first pattern) and a mode for acquiring data based on a speed-prioritizing pattern (second pattern).

[0185] The accuracy-prioritizing pattern is a pattern in which the colorimeter 45 moves a first width in the paper width direction, and the colorimeter 45 reads all or some of the multiple patches arranged in the paper width direction. The speed-priority pattern is a pattern in which the colorimeter 45 stops or moves a second width smaller than the first width in the paper width direction, and the scanner 46 reads all or some of the patches of multiple patches arranged in the paper width direction.

[0186] CPU41 switches between two modes for acquiring data based on a precision-prioritized pattern and a speed-prioritized pattern, as part of a color management process.

[0187] CPU41 switches between a mode for acquiring data based on an accuracy-priority pattern and a mode for acquiring data based on a speed-priority pattern, based on a ratio determined based on settings received from the user.

[0188] The CPU 41 may acquire data based on an accuracy-prioritizing pattern for a first area of ​​a single sheet of paper, and acquire data based on a speed-prioritizing pattern for a second area of ​​the same sheet of paper that is different from the first area.

[0189] The CPU 31 of the image forming apparatus 30 controls the image forming unit 36 ​​(image forming engine) to print patches on multiple sheets of paper as a color management chart. The CPU 41 of the reading device 40 may acquire data based on an accuracy-prioritizing pattern for a first sheet of paper among multiple sheets, and acquire data based on a speed-prioritizing pattern for a second sheet of paper different from the first sheet among multiple sheets.

[0190] The CPU 41 does not need to acquire the data read by the scanner 46 for the accuracy priority pattern. For speed-prioritizing patterns, the CPU 41 does not need to acquire the data read by the colorimeter 45. The CPU 41 may stop the colorimeter 45 in the paper width direction when reading a speed-priority pattern.

[0191] The CPU 41 may, for accuracy priority patterns, acquire data from some of the patches read by the colorimeter 45 from among a plurality of patches arranged in the paper width direction, and the scanner 46 may acquire data from the other patches read by the colorimeter 45 from among the plurality of patches arranged in the paper width direction.

[0192] For speed-prioritizing patterns, the CPU 41 may acquire data from scans of some of the multiple patches arranged in the paper width direction by the scanner 46, and data from scans of other patches among the multiple patches arranged in the paper width direction that are not read by the scanner 46 by the colorimeter 45.

[0193] For the speed - priority pattern, the CPU 41 of the reading device 40 may correct the data read by the scanner 46 based on the data read by the colorimeter 45.

[0194] According to the fifth embodiment, the CPU 41 of the reading device 40 switches the mode (reading mode) for acquiring data used for color management of the image forming device 30. The CPU 41 switches between a mode for acquiring data based on the accuracy - priority pattern (the first pattern) and a mode for acquiring data based on the speed - priority pattern (the second pattern). Therefore, the CPU 51 of the color management device 50 can perform color management in accordance with the balance between the required quality and delivery date.

[0195] Note that the descriptions in the above embodiments are examples of the color management method, color management device, program, image forming device, and reading device according to the present invention, and are not limited thereto. The detailed configurations and detailed operations of each device constituting the system can also be appropriately changed without departing from the spirit of the present invention. For example, the characteristic processes in each embodiment may be executed in combination.

[0196] Also, the types and numbers of patterns used for color management of the image forming device 30 are not limited to the above examples. Also, the number or arrangement of patches constituting the pattern (chart) can be appropriately changed.

[0197] Also, although the reading device 40 has been described as a device separate from the image forming device 30, the reading device 40 (in - line reading unit 44) may be a part of the image forming device 30. Also, the color management device 50 may be an independent device or may be included in other devices. For example, the color management device 50 may be included in the printer controller 20, the image forming device 30, or the reading device 40.

[0198] Furthermore, in the first to third embodiments described above, each process performed by the CPU 51 (color management application) of the color management device 50 may be performed by another device within the color management system 100, or by a device that can be connected to the color management system 100. Alternatively, each process performed by the CPU 51 of the color management device 50 may be performed in cooperation with multiple devices.

[0199] In the embodiments described above, the case in which the image forming apparatus 30 is an electrophotographic image forming apparatus that forms images using toner has been described, but it is not limited to this. The image forming apparatus 30 may be an inkjet image forming apparatus or the like.

[0200] Furthermore, the various data stored in the memory unit 52 of the color management device 50 (printer information, color management dataset, etc.) can be stored in an external device or the like, as long as the CPU 51 can access them.

[0201] The computer-readable medium used to store the programs for executing each process is not limited to the examples above. Furthermore, a carrier wave may be used as the medium for providing program data via a communication line.

[0202] The embodiments disclosed herein are for illustrative purposes only and not intended to limit the scope of the invention. The scope of the invention should be interpreted as described in the claims. [Explanation of Symbols]

[0203] 10 PC 20 Printer Controllers 30 Image forming apparatus 31 CPU 32 Storage section 33 Display section 34 Control section 35 Communications Department 36 Image forming unit 40 Reader 41 CPU 42 Storage section 43 Communications Department 44 Inline reading unit 45 Colorimeter 46 Scanners 50 color management device 51 CPU 52 Storage section 53 Display section 54 Control section 55 Communications Department 100-Color Management System 521 Color Management Application Program N Communication Network T1 Printer Information Table T2 Color Management Dataset Table

Claims

1. A 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 on the transport path of the paper printed by the image forming engine. A mode in which the colorimeter moves a first width in the paper width direction, and the colorimeter acquires data based on a first pattern for reading all or some of the multiple patches arranged in the paper width direction, A mode in which the colorimeter stops in the paper width direction or moves by a second width smaller than the first width, and the scanner acquires data based on a second pattern for reading all or some of the multiple patches arranged in the paper width direction, Switch Color management method.

2. 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, as part of a process related to color management. The color management method according to claim 1.

3. 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, based on a ratio determined based on settings received from the user. The color management method according to claim 2.

4. The color management device acquires data based on the first pattern for a first area of ​​a sheet of paper, and acquires data based on the second pattern for a second area of ​​the sheet of paper that is different from the first area. The color management method according to claim 2.

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

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

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

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

9. The color management device, with respect to the first pattern, The aforementioned colorimeter acquires data by reading some of the patches among a plurality of patches arranged in the width direction of the paper. The scanner acquires data from multiple patches arranged in the width direction of the paper, excluding the patches that the colorimeter reads from the colorimeter. The color management method according to claim 1.

10. The color management device, with respect to the second pattern, The scanner acquires data by reading some of the patches among a plurality of patches arranged in the paper width direction. The colorimeter acquires data from patches other than the ones read by the scanner, among a plurality of patches arranged in the width direction of the paper. The color management method according to claim 1.

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

12. The aforementioned color management device performs color management based on a color management dataset. The aforementioned color management device is The settings for the aforementioned color management dataset are accepted. The mode setting corresponding to the aforementioned set color management dataset is obtained, The data is acquired in the mode indicated by the acquired mode setting. The color management method according to claim 1.

13. The color management dataset includes the setting of the mode, The color management device acquires data in the mode indicated by the mode setting included in the set color management dataset. The color management method according to claim 12.

14. The aforementioned color management includes at least one of the following: color verification, color profile creation, and color correction. The color management method according to claim 1.

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

16. A program for causing a computer that controls a color management device to execute the color management method described in any one of claims 1 to 14.

17. Equipped with an image forming engine, An image forming apparatus that can cooperate with a reading device equipped with a colorimeter and a scanner, which is installed on the transport path of the paper printed by the image forming engine, The aforementioned image forming engine The colorimeter moves a first width in the paper width direction, and a first pattern is used for the colorimeter to read all or some of the patches among a plurality of patches arranged in the paper width direction to acquire data. A second pattern for the colorimeter to stop in the paper width direction or move by a second width smaller than the first width, and for the scanner to read all or some of the multiple patches arranged in the paper width direction to acquire data, Switch and print. Image forming apparatus.

18. A reading device installed on the transport path of paper printed by an image forming engine, and comprising a colorimeter and a scanner, A mode in which the colorimeter moves a first width in the paper width direction, and the colorimeter acquires data based on a first pattern for reading all or some of the multiple patches arranged in the paper width direction, A mode in which the colorimeter stops in the paper width direction or moves by a second width smaller than the first width, and the scanner acquires data based on a second pattern for reading all or some of the multiple patches arranged in the paper width direction, Switch A reading device.

Images