Image forming apparatus and color measurement control method

Abstract

To provide an image forming apparatus which shortens colorimetric time.SOLUTION: An image forming apparatus 1 includes: a colorimeter 40; a scanner 23 (reading device) for reading an image formed on a recording medium; and a colorimetric method determination unit 54 for determining whether to execute colorimetry by the colorimeter or to execute colorimetry using the reading device according to an operation state of an own apparatus or a type of a colorimetry execution instruction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an image forming apparatus and a color measurement control method.

Background Art

[0002] Conventionally, as color measurement methods, there are a color measurement method using a colorimeter and a color measurement method using a scanner. In the color measurement method using a colorimeter, for example, as described in Patent Document 1, a colorimeter connected in-line to an image forming apparatus slides a printed measurement chart (measurement sheet) in the CD (Cross Direction) direction to measure patches on the measurement sheet. On the other hand, for color measurement using a scanner, a color conversion table is created that converts the scanner RGB (Red, Green, Blue) values of a scanner disposed within the image forming apparatus into the Lab color space of a colorimeter. Then, a printed measurement chart (measurement sheet) is scanned, and color values are measured (estimated) from the scanned image of the measurement sheet using the color conversion table.

[0003] Patent Document 1 describes that a sensor control unit controls a color measurement sensor to measure the density of patches formed on a sheet after printing for a page that has received a color measurement sensor measurement instruction, and obtains color measurement data (color measurement result).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, conventionally, in a color measurement method using a colorimeter, for example, the color measurement method described in Patent Document 1 directly measures the color value of a measurement sheet, so the color measurement accuracy is high. However, in color measurement using a colorimeter, since the patches on the measurement sheet are slid one by one for color measurement, the color measurement time is long. On the other hand, in color measurement using a scanner, the color measurement value is estimated by arithmetic processing of a computer using a scanned image of the measurement sheet and a color conversion table, so color measurement can be performed in a short time. However, color measurement using a scanner has lower color measurement accuracy than color measurement using a colorimeter. Therefore, a technique for automatically switching between color measurement using a colorimeter and color measurement using a scanner according to the requirement of color measurement accuracy is desirable.

[0006] The present invention has been made in view of the above situation, and an object of the present invention is to provide an image forming apparatus that shortens the color measurement time.

Means for Solving the Problems

[0007] The image forming apparatus of the present invention includes a colorimeter, a reading device that reads an image formed on a recording medium, and a color measurement method determination unit that determines whether to perform color measurement by the colorimeter or perform color measurement using the reading device according to the operation state of the self-device or the type of color measurement execution instruction. Note that the above image forming apparatus is an aspect of the present invention, and a color measurement control method reflecting one aspect of the present invention is also configured in the same manner as the above image forming apparatus.

Effects of the Invention

[0008] According to the present invention, an image forming apparatus that shortens the color measurement time can be provided. Problems, configurations, and effects other than the above will be clarified by the description of the following embodiments.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same function or configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0011] <One Embodiment> [Schematic Configuration of Image Forming Apparatus] First, the schematic configuration of an image forming apparatus 1 according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing the schematic configuration of the image forming apparatus 1 according to the present embodiment. As shown in FIG. 1, the image forming apparatus 1 includes a paper feeding device 10, a printer 20, a paper discharging device 30, and a colorimeter 40. The paper feeding device 10, the printer 20, and the paper discharging device 30 are connected and arranged in order from the upstream side to the downstream side in the conveyance direction of the recording medium. The colorimeter 40 is connected and arranged to the paper discharging device 30.

[0012] The paper feeding device 10 is an example of a recording medium supply device, includes a container (paper feeding tray) for accommodating the recording medium, and supplies the recording medium to the printer 20. In the present embodiment, as the recording medium on which an image is formed, printing paper, cell, film, cloth, etc. can be used. Also, the supply of the recording medium to the printer 20 is called "paper feeding".

[0013] The printer 20 is configured as, for example, a one-pass UV inkjet printer, and as shown in FIG. 1, includes a main cylinder 21, a plurality of head units 22, and a scanner 23. Note that the printer 20 is not limited to a one-pass UV inkjet printer, and may be, for example, an image forming apparatus that forms an image on a recording medium by an electrophotographic method other than a one-pass UV inkjet printer.

[0014] The main cylinder 21 is formed of a cylindrical member and rotates counterclockwise in the drawing by a drive motor (not shown). The main cylinder 21 holds a recording medium along the cylindrical outer peripheral surface and conveys the recording medium as it rotates. The conveyance surface of the main cylinder 21 faces the plurality of head units 22 and the scanner 23, and the head unit 22 performs processing related to image formation on the recording medium conveyed by the main cylinder 21.

[0015] The plurality of head units 22 forms an image by discharging ink droplets at an appropriate timing onto the recording surface of the recording medium that moves in accordance with the rotation of the main cylinder 21 and landing them on the recording target surface of the recording medium. The plurality of head units 22 can be configured, for example, by four head units 22 that each discharge four colors of ink. In this case, the four head units 22 are configured by head units that discharge Y (yellow), M (magenta), C (cyan), and K (black) ink, respectively.

[0016] The scanner 23 is an example of a reading device including an image sensor or the like, and reads an image formed on a recording medium, for example, an image of a colorimetric test sheet on which a plurality of patches are formed. Note that in FIG. 1, an example in which the scanner 23 is configured inside the printer 20 is shown, but the scanner 23 may be configured outside the printer 20.

[0017] The paper discharge device 30 includes a paper discharge tray 31 that stores the recording medium on which an image is formed and is discharged from the printer 20, and a sub-tray 32 for supplying a colorimetric test sheet to the colorimeter 40.

[0018] The colorimeter 40 is an automatic sheet feeding type colorimeter, and is composed of, for example, a spectrophotometer capable of simultaneously measuring color and gloss, and measures the pixel value (color value) in the Lab color space of the test sheet for color measurement supplied by the sub-tray 32. Further, the colorimeter 40 outputs the measured color value of the test sheet to a later-described CPU (Central Processing Unit) 50 (see FIG. 2) of the image forming apparatus 1. In the present embodiment, when it is determined by a later-described color measurement method determination unit 54 that color measurement by the colorimeter is to be executed, the colorimeter 40 performs color measurement on the fed test sheet for color measurement. Note that the colorimeter 40 is not limited to the automatic sheet feeding type, and may be a manual sheet feeding type.

[0019] [Example of Hardware Configuration of Image Forming Apparatus] Next, the hardware configuration of the image forming apparatus 1 will be described. FIG. 2 is a block diagram showing an example of the hardware configuration of the image forming apparatus 1 according to the present embodiment. As shown in FIG. 2, the image forming apparatus 1 further includes a paper conveyance unit 24, an image forming unit 25, a CPU 50, a ROM (Read Only Memory) 28, and a RAM (Random Access Memory) 29, in addition to each component described in FIG. 1. Further, the image forming apparatus 1 includes an operation display unit 60, a storage device 70, and a communication IF (Interface) 80. Each component described in FIG. 1, the paper conveyance unit 24, the image forming unit 25, the CPU 50, the ROM 28, the RAM 29, the operation display unit 60, the storage device 70, and the communication IF 80 are connected via a bus B so as to be able to transmit and receive information data to and from each other.

[0020] The paper conveyance unit 24 conveys the recording medium fed from the paper feeding device 10 to the paper discharging device 30 by a plurality of rollers. The image forming unit 25 includes the main cylinder 21 shown in FIG. 1, a plurality of head units 22, an irradiation unit (not shown), a transfer unit, a fixing unit, etc., and forms an image on the recording medium by the operations of the above-described units.

[0021] The CPU 50 controls the operations of each component of the image forming apparatus 1. For example, the CPU 50 controls the image forming process of the image forming unit 25 based on a user's print instruction performed via the operation display unit 60, and controls the paper supply process by the paper feeding device 10. Further, the CPU 50 performs, for example, the first color measurement control process and the second color measurement control process described later based on a user's color measurement execution instruction performed via the operation display unit 60. Note that instead of the CPU 50, a GPU (Graphics Processing Unit) may be used, or the CPU 50 and the GPU may be used in combination.

[0022] As shown in FIG. 2, the CPU 50 includes an RGB value acquisition unit 51, a color value conversion table creation unit 52, a color value conversion unit 53, and a color measurement method determination unit 54. In FIG. 2, only the components of the CPU 50 related to the first color measurement control process and the second color measurement control process described later are shown, and the illustration and description of the components related to other processes are omitted.

[0023] The RGB value acquisition unit 51 acquires the RGB values of each patch included in the test sheet for creating the color value conversion table from the read image of the test sheet for creating the color value conversion table read by the scanner 23, and outputs them to the color value conversion table creation unit 52. Further, the RGB value acquisition unit 51 acquires the RGB values of each patch included in the test sheet for color measurement from the read image of the test sheet for color measurement read by the scanner 23, and outputs them to the color value conversion unit 53.

[0024] The color value conversion table creation unit 52 creates a color value conversion table using the color measurement values of each patch included in the test sheet for creating the color value conversion table measured by the colorimeter 40 and the RGB values of each patch acquired by the RGB value acquisition unit 51. Note that the color value conversion table is a data table for converting the RGB values of the scanner 23 into pixel values in the Lab color space of the colorimeter 40.

[0025] The color value conversion unit 53 converts the RGB values of each patch included in the read image of the test sheet for color measurement read by the scanner 23 into pixel values in the Lab color space based on the color value conversion table. In the present embodiment, when the color measurement method determination unit 54 determines that color measurement using the scanner 23 is to be performed, the color value conversion unit 53 performs color value conversion on the read image of the test sheet for color measurement read by the scanner 23.

[0026] The color measurement method determination unit 54 determines whether to perform color measurement using the colorimeter 40 or color measurement using the scanner 23 according to the operating state of the own device (image forming apparatus 1) or the type of color measurement execution instruction. Here, the operating state includes the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing. The types of color measurement execution instructions include regular color measurement, color measurement before and after the execution of a print job, and color measurement during the execution of a print job. Note that even when the operating state of the image forming apparatus 1 is another state that affects print quality (a state other than the above-mentioned operating states), it is necessary to perform color measurement using a colorimeter with high color measurement accuracy.

[0027] When the color measurement method determination unit 54 receives the first color measurement execution instruction after the own device is started up, and the operating state of the own device is any one of the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing, it determines to perform color measurement using the colorimeter 40. This determination is because when the operating state of the image forming apparatus 1 is any one of the above-mentioned various operating states, there is a possibility of affecting print quality, and thus it is necessary to perform color measurement using a colorimeter with high color measurement accuracy. Also, when the operating state of the own device is a state other than the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing, the color measurement method determination unit 54 determines to perform color measurement using the scanner 23.

[0028] When the color measurement method determination unit 54 receives a color measurement execution instruction other than the above-described first color measurement execution instruction, and the type of the color measurement execution instruction is any one of steady color measurement, color measurement before and after the execution of a printing job, and color measurement during the execution of a printing job, it determines to execute color measurement using the scanner 23. This determination is because the requirements for color measurement accuracy are relatively loose for steady measurement, color measurement before and after the execution of a printing job, and color measurement during the execution of a printing job. Also, when the type of the color measurement execution instruction is other than steady color measurement, color measurement before and after the execution of a printing job, and color measurement during the execution of a printing job, the color measurement method determination unit 54 determines to execute color measurement using the colorimeter 40. Here, other than steady color measurement, color measurement before and after the execution of a printing job, and color measurement during the execution of a printing job means, for example, a case where the user designates color measurement using the colorimeter in the manual displayed on the operation display unit 60.

[0029] The ROM 28 is composed of a storage medium such as a non-volatile memory, and stores programs, data, etc. that the CPU 50 executes and refers to.

[0030] The RAM 29 is composed of a storage medium such as a volatile memory, and temporarily stores information (data) necessary for each process performed by the CPU 50.

[0031] The operation display unit 60 is composed of a display unit including a display device such as an LCD (Liquid Crystal Display) or an organic EL (Electro-luminescence) display, and an operation unit including a touch sensor, etc. The display unit and the operation unit are integrally formed as a touch panel, for example. The operation display unit 60 generates an operation signal representing the operation content from the user input to the operation unit, and supplies the operation signal to the CPU 50. Also, the operation display unit 60 displays the operation content by the user, setting information, etc. on the display unit based on the display signal supplied from the CPU 50. Note that it is also possible to configure the operation unit with a mouse, a tablet, etc. and configure it separately from the display unit.

[0032] The storage device 70 is composed of a computer-readable non-transitory recording medium storing programs executed by the CPU 50, and is composed of a storage device such as an HDD (Hard Disk Drive). The storage device 70 stores programs for the CPU 50 to control each part, an OS (Operating System), programs such as a controller, and data. Note that part of the programs and data stored in the storage device 70 may be stored in the ROM 28. Also, the computer-readable non-transitory recording medium storing the programs executed by the CPU 50 is not limited to an HDD, and may be, for example, a recording medium such as an SSD (Solid State Drive), a CD (Compact Disc)-ROM, or a DVD (Digital Versatile Disc)-ROM.

[0033] The communication IF 80 is composed of a NIC (Network Interface Card), a modem, etc., establishes a connection with a post-processing device (not shown), a PC (Personal Computer) terminal (not shown), etc., and executes transmission and reception of various data.

[0034] [Procedure of the First Color Measurement Control Process] Next, the first color measurement control process in the image forming apparatus 1 will be described. The first color measurement control process is a process executed by the image forming apparatus 1 when it receives a first color measurement execution instruction after being activated. In the first color measurement control process, the image forming apparatus 1 performs color measurement control according to its own operation state. FIG. 3 is a flowchart showing the procedure of the first color measurement control process in the image forming apparatus 1 according to the present embodiment. The processes described below start when the image forming apparatus 1 is activated and the user gives a first color measurement execution instruction via the operation display unit 60.

[0035] First, the CPU 50 of the image forming apparatus 1 receives a color measurement execution instruction from the operation display unit 60 (S10).

[0036] Next, the color measurement method determination unit 54 of the CPU 50 determines whether the operation state of the image forming apparatus 1 is the initial setup state (S11).

[0037] When the color measurement method determination unit 54 determines that the operation state of the image forming apparatus 1 is the initial setup state (YES in S11), it performs the process of S15 described later.

[0038] On the other hand, when the color measurement method determination unit 54 determines that the operation state of the image forming apparatus 1 is not the initial setup state (NO in S11), it performs the process of S12. In the process of S12, the color measurement method determination unit 54 determines whether the operation state of the image forming apparatus 1 is the startup state after a long-term stop.

[0039] When the color measurement method determination unit 54 determines that the operation state of the image forming apparatus 1 is the startup state after a long-term stop (YES in S12), it performs the process of S15 described later.

[0040] On the other hand, when the color measurement method determination unit 54 determines that the operation state of the image forming apparatus 1 is not the startup state after a long-term stop (NO in S12), it determines whether there is a component replacement that affects printing (S13).

[0041] When the color measurement method determination unit 54 determines that there is no component replacement that affects printing (NO in S13), it determines to perform color measurement using the scanner 23 (S14). Also, in S14, the color value conversion unit 53 performs color value conversion and color measurement based on the read image of the test sheet for color measurement read by the scanner 23 and the color value conversion table created by the color value conversion table creation unit 52.

[0042] On the other hand, when the color measurement method determination unit 54 determines that there is a component replacement that affects printing (YES in S13), it determines to perform color measurement using the colorimeter 40 (S15). Also, in S15, the CPU 50 outputs a color measurement instruction to the colorimeter 40. Then, the colorimeter 40 performs color measurement on the test sheet for color measurement supplied by the sub-tray 32. After the process of S14 or S15, the first color measurement control process ends.

[0043] [Second Color Measurement Control Process] Next, the second color measurement control process in the image forming apparatus 1 will be described. The second color measurement control process is a process executed by the image forming apparatus 1 when it receives a color measurement execution instruction other than the first color measurement execution instruction after being activated. In the second color measurement control process, the image forming apparatus 1 performs color measurement control according to the type of the color measurement execution instruction. FIG. 4 is a flowchart showing the procedure of the second color measurement control process in the image forming apparatus 1 according to the present embodiment. The process described below starts when the user gives a color measurement execution instruction via the operation display unit 60.

[0044] First, the CPU 50 of the image forming apparatus 1 receives a color measurement execution instruction from the operation display unit 60 (S20).

[0045] Next, the color measurement method determination unit 54 of the CPU 50 determines whether the type of the color measurement execution instruction is regular color measurement (S21).

[0046] If the color measurement method determination unit 54 determines that the type of the color measurement execution instruction is regular color measurement (YES in S21), it performs the process of S25 described later.

[0047] On the other hand, if the color measurement method determination unit 54 determines that the type of the color measurement execution instruction is not regular color measurement (NO in S21), it determines whether the color measurement execution instruction is a color measurement instruction before and after the execution of the print job (S22). In the case of mass printing, in order to ensure print quality, test charts for color measurement are added at the beginning, middle, and end of the print job, and color measurement may be performed before, during, and after the execution of the print job.

[0048] If the color measurement method determination unit 54 determines that the type of the color measurement execution instruction is a color measurement before and after the execution of the print job (YES in S22), it performs the process of S25 described later.

[0049] On the other hand, if the color measurement method determination unit 54 determines that the type of the color measurement execution instruction is not a color measurement before and after the execution of the print job (NO in S22), it determines whether the type of the color measurement execution instruction is a color measurement during the execution of the print job (S23).

[0050] When the color measurement method determination unit 54 determines that the type of the color measurement execution instruction is not the color measurement during the execution of the print job (NO in S23), it determines to perform color measurement using the colorimeter 40 (S24). Also, in this process, the CPU 50 outputs a color measurement instruction to the colorimeter 40. Then, the colorimeter 40 performs color measurement on the test sheet supplied by the sub-tray 32.

[0051] On the other hand, when the color measurement method determination unit 54 determines that the type of the color measurement execution instruction is the color measurement during the execution of the print job (YES in S23), it determines to perform color measurement using the scanner 23 (S25). Also, in this process, the color value conversion unit 53 of the CPU 50 performs color value conversion and color measurement based on the read image of the test sheet for color measurement read by the scanner 23 and the color value conversion table created by the color value conversion table creation unit 52. After the process of S24 or S25, the second color measurement control process ends.

[0052] [Effect] As described above, when the image forming apparatus 1 according to the present embodiment receives the first color measurement execution instruction after startup, it performs the first color measurement control process of automatically switching between color measurement using the colorimeter and color measurement using the scanner according to the operation state of the own apparatus. In the first color measurement control process, when the operation state of the image forming apparatus 1 is any one of the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing (when the required color measurement accuracy is high), the image forming apparatus 1 executes color measurement using the colorimeter 40. Also, when the operation state of the image forming apparatus 1 is a state other than the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing (when the required color measurement accuracy is not high), the image forming apparatus 1 executes color measurement using the scanner 23.

[0053] In addition, when the image forming apparatus 1 according to the present embodiment receives a color measurement execution instruction after the first color measurement execution instruction after startup, it performs a second color measurement control process of automatically switching between color measurement by a colorimeter and color measurement using a scanner according to the type of the color measurement execution instruction. In the second color measurement control process, when the type of the color measurement execution instruction is any one of steady measurement, color measurement before and after execution of a print job, and color measurement during execution of a print job (when the required color measurement accuracy is not high), the image forming apparatus 1 executes color measurement using the scanner 23. Further, when the type of the color measurement execution instruction is other than steady measurement, color measurement before and after execution of a print job, and color measurement during execution of a print job (when the required color measurement accuracy is high), the image forming apparatus 1 executes color measurement by a colorimeter. Therefore, according to the image forming apparatus 1 according to the present embodiment, it is possible to automatically switch between color measurement using a color measuring machine and color measurement using a scanner according to the requirement of color measurement accuracy, and shorten the color measurement time.

[0054] Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other application examples and modification examples can be taken without departing from the gist of the present invention described in the claims. For example, the above-described embodiments have described the configuration of the image forming apparatus in detail and specifically for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, it is possible to replace a part of the configuration of the embodiment described here with the configuration of another embodiment, and further, it is possible to add the configuration of another embodiment to the configuration of a certain embodiment. Also, it is possible to add, delete, or replace a part of the configuration of the embodiment with another configuration. Also, the control lines and information lines show those considered necessary for explanation, and not necessarily all the control lines and information lines on the product are shown. In practice, it may be considered that almost all the components are interconnected.

Description of Reference Numerals

[0055] 1…Image forming apparatus, 10…Paper feeding apparatus, 20…Printer, 21…Main cylinder, 22…Head unit, 23…Scanner, 24…Paper conveyance unit, 25…Image forming unit, 28…ROM, 29…RAM, 30…Paper discharging apparatus, 31…Paper discharge tray, 32…Sub tray, 40…Colorimeter, 50…CPU, 51…RGB value acquisition unit, 52…Color value conversion table creation unit, 53…Color value conversion unit, 54…Color measurement method determination unit, 60…Operation display unit, 70…Storage device, 80…Communication IF

Claims

1. A colorimeter, A reading device that reads an image formed on a recording medium, A color measurement method determination unit that determines whether to perform color measurement by the colorimeter or color measurement using the reading device according to the operating state of the device itself or the type of color measurement execution instruction, An image forming apparatus.

2. The operating state includes an initial setup state, a startup state after a long-term stop, and a state where there is a component replacement that affects printing The image forming apparatus according to claim 1.

3. The types of the color measurement execution instructions include regular color measurement, color measurement before and after the execution of a printing job, and color measurement during the execution of a printing job The image forming apparatus according to claim 1.

4. When the color measurement method determination unit receives the first color measurement execution instruction after the device is started up, If the operating state is any one of the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing, it is determined to perform color measurement by the colorimeter, If the operating state is a state other than the initial setup state, the startup state after a long-term stop, and the state where there is a component replacement that affects printing, it is determined to perform color measurement using the reading device The image forming apparatus according to claim 2.

5. When the color measurement method determination unit receives a color measurement execution instruction other than the first color measurement execution instruction after the device is started up, If the type of the color measurement execution instruction is any one of the regular color measurement, the color measurement before and after the execution of the printing job, and the color measurement during the execution of the printing job, it is determined to perform color measurement using the reading device, If the type of the color measurement execution instruction is other than the regular color measurement, the color measurement before and after the execution of the printing job, and the color measurement during the execution of the printing job, it is determined to perform color measurement by the colorimeter The image forming apparatus according to claim 3.

6. An RGB value acquisition unit that acquires the RGB values of each patch included in the test sheet for creation from the read image of the test sheet for creation of the color value conversion table read by the reading device, and acquires the RGB values of each patch included in the test sheet for color measurement from the read image of the test sheet for color measurement read by the reading device A color value conversion table creation unit that creates a color value conversion table for converting the RGB values into pixel values in the Lab color space of the colorimeter, using the color measurement values of each patch included in the test sheet for creation measured by the colorimeter and the RGB values of each patch obtained by the RGB value acquisition unit; A color value conversion unit that converts the RGB values of each patch included in the read image of the test sheet for color measurement read by the reading device into pixel values in the Lab color space, based on the color value conversion table; The image forming apparatus according to claim 1.

7. When the color measurement method determination unit determines that color measurement by the colorimeter is to be executed, The colorimeter performs color measurement on the fed test sheet for color measurement. The image forming apparatus according to claim 1.

8. When the color measurement method determination unit determines that color measurement using the reading device is to be executed, The color value conversion unit performs color value conversion on the read image of the test sheet for color measurement read by the reading device. The image forming apparatus according to claim 6.

9. A color measurement control method in an image forming apparatus including a colorimeter and a reading device that reads an image formed on a recording medium, the method including: A step of determining whether to execute color measurement by the colorimeter or color measurement using the reading device according to the operation state of the apparatus itself or the type of color measurement execution instruction. Color measurement control method.

Images