JP2007110651A - Image processing device, image processing method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a measured value extremely near to a colorimetric result derived from a colorimetric machine to be suitably acquired from the colorimetric result derived from a device such as a scanner etc. which is inferior in colorimetric accuracy. <P>SOLUTION: A second piece of color data is acquired after reading a correction chart by a scanner 106 etc. which is an object to be corrected. The correction chart is formed and outputted by a printer 107 etc. from a first piece of color data defined by an equally arranged arbitrary color space. A PC 102 for controlling generates a first module for converting a first piece of color data to a second piece of color data. On the other hand, a second module for converting the first piece of color data to a third piece of color data which is acquired after reading the correction chart by the colorimetric machine 104 and does not depend on the device is generated. Then a third module for converting the second piece of color data to the third piece of color data by combining the first and the second module is generated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image processing apparatus, an image processing method, and a program that execute processing such as profile creation using a device that measures color.

  In recent years, printers capable of color output have become widespread and are widely used in offices and homes. However, even with the same printer model, there is a problem that the color of the output printed matter varies depending on various factors such as environmental changes and aging.

In particular, since a plurality of printers are used in an office or the like, the problem appears remarkably. To solve this problem, we proposed a method to output a specific patch, read it with a device called "colorimeter" to measure the color, and create a profile for color conversion from the read information. (For example, refer to Patent Document 1). As a result, variations in color in the printer are reduced, and printing in an optimum state is possible.
JP 2002-94812 A

  However, the above-described colorimeter is an expensive device, and it is difficult in terms of cost effectiveness to disseminate it so as to reach many users. In addition, since the colorimeter reads patches one by one when measuring automatically or manually, there is a problem that it takes time for color measurement as the number of readings increases.

  Therefore, a scanner is used as a device for measuring colors instead of a colorimeter. In recent years, digital multi-function peripherals (MFPs) in which a printer and a scanner are integrated have become widespread. Even when the MFP is used as a single scanner, it is much cheaper than a colorimeter. Furthermore, since the scanner scans the entire surface, the time required for the measurement is much shorter than that of the colorimeter.

  However, the colorimeter outputs a color space value that does not depend on a device such as the L * a * b * space. On the other hand, the value obtained from the scanner is generally sRGB or RGB space depending on the scanner in many cases.

  sRGB can be converted into L * a * b *, which is a device-independent color space, by calculation. However, since the scanner is not originally intended to acquire the L * a * b * value, the accuracy is very poor when compared with the result obtained by the colorimeter. In addition, since the variation of the device state is greater than that of the colorimeter, the value may change over time even when a printed material having the same value is read.

  On the other hand, RGB that depends on the device cannot be used in place of the colorimeter because there is no method for converting directly to L * a * b *, which is a color space that does not depend on the device.

  For the above reasons, there have been some obstacles to using a scanner instead of a colorimeter.

  The present invention has been made in consideration of such circumstances, and an object thereof is to provide the following image processing apparatus, image processing method, and program. That is, a measurement value extremely close to the color measurement result obtained by the colorimeter can be suitably obtained from the color measurement result obtained by a device having a low color measurement accuracy such as a scanner.

In order to solve the above problems, an image processing apparatus according to the present invention provides:
A correction chart in which first color data defined in an arbitrary color space arranged according to a predetermined rule is formed by an output device is read by the first input device, and the color of the first input device is read Reading means for obtaining second color data defined in space;
First creating means for creating a first module for converting the first color data into the second color data;
A second module for converting the first color data into third color data defined in a color space of the second input device obtained by reading the correction chart with a second input device; A second creation means for creating;
And a third creating means for creating a third module for combining the first and second modules to convert the second color data into the third color data. .

In order to solve the above-described problem, an image processing method according to the present invention includes:
A correction chart in which first color data defined in an arbitrary color space arranged according to a predetermined rule is formed by an output device is read by the first input device, and the color of the first input device is read A reading step of obtaining second color data defined in space;
A first creation step of creating a first module for converting the first color data into the second color data;
A second module for converting the first color data into third color data defined in a color space of the second input device obtained by reading the correction chart with a second input device; A second creation step to create;
And a third creation step of creating a third module for combining the first and second modules to convert the second color data into the third color data. .

Furthermore, in order to solve the above problems, a program according to the present invention is stored in a computer.
A correction chart in which first color data defined in an arbitrary color space arranged according to a predetermined rule is formed by an output device is read by a first input device, and the first chart is read into the computer. A reading procedure for obtaining second color data defined in the color space of the input device;
A first creation procedure for creating a first module for converting the first color data into the second color data;
A second module for converting the first color data into third color data defined in a color space of the second input device obtained by reading the correction chart with a second input device; A second creation procedure to create;
And a third creation procedure for creating a third module for combining the first and second modules to convert the second color data into the third color data. And

  According to the present invention, a measurement value extremely close to the color measurement result obtained by the colorimeter can be suitably obtained from the color measurement result obtained by a device such as a scanner having poor color measurement accuracy. Due to such effects, it is not always necessary to use a colorimeter, which is an expensive device, when measuring colors, and the cost for system construction can be greatly reduced. In addition, unlike the colorimeter, it does not require labor during measurement, so the burden on the user can be greatly reduced.

  Hereinafter, a color image processing system according to an embodiment of the present invention and details of the processing will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a configuration of a color image processing system according to the first embodiment of the present invention. The color image processing system according to the present embodiment is realized in an environment in which various devices are connected to a network 105 such as the Internet. On the network 105, a color digital multi-function peripheral (color MFP) 101, a control PC 102, and a printer 107 are connected. Further, the control PC 102 and the colorimeter 104 are connected by a cable 103. Further, the control PC 102 and the scanner 106 are connected by a cable 108.

  The color MFP 101 includes a scanner unit (an image reading unit 201 described later) and a printer unit (a recording device 203 described later). The scanner unit can capture data in sRGB and transmit it to the control PC 102. The scanner 106 is a single scanner and can similarly take in data in sRGB.

  The colorimeter 104 can capture color space data independent of the device. For example, L * a * b * can be cited as an example of data to be fetched. The object of the present embodiment is to make correspondence between the data acquired from the scanner unit of the color MFP 101 and the scanner 106 and the data acquired by the colorimeter 104. In addition, the control PC 102 executes importing of data taken in by the colorimeter 104 and various processes performed in this embodiment.

  FIG. 2 is a block diagram showing the configuration of the color MFP 101 according to the first embodiment of the present invention. In FIG. 2, an image reading unit 201 including an auto document feeder (ADF) irradiates a bundle or one original image with a light source (not shown), and forms an original reflection image on a fixed image sensor with a lens. To do. Then, the image reading unit 201 obtains a raster-like image reading signal as image information from the fixed imaging element. In a normal copying function, the image signal is processed into a recording signal by the data processing device 205 and sequentially output to the recording device 203 to form an image on paper.

  An operator's instruction to the color MFP 101 is performed from the input device 206 which is a key operation unit provided in the color MFP 101, and a series of these operations is controlled by a control unit in the data processing device 205.

  On the other hand, the display device 204 displays the operation input status and the image data being processed. The storage device 202 is an area in which image data captured by the image reading unit 201 can be stored.

  The network I / F 207 is an interface for connecting to the network 105. By using this, image data can be received from the control PC 102, processed by the data processing device 205, and printed by the recording device 203. In addition, data read by the image reading unit 201 and processed by the data processing device 205 can be transmitted via the network I / F 207 and sent to the control PC 102.

  FIG. 3 is a block diagram showing the configuration of the printer 107 according to the first embodiment of the present invention. As shown in FIG. 3, the printer 107 has a configuration without an image reading unit as compared with the color MFP 101. The storage device 301, recording device 302, display device 303, data processing device 304, input device 305, and network I / F 306 in the printer 107 have substantially the same functions as those of the color MFP 101. That is, they function in substantially the same manner as the storage device 202, recording device 203, display device 204, data processing device 205, input device 206, and network I / F 207 of the color MFP 101. The printer 107 receives data from the control PC 102 mainly through the network I / F 306, performs processing with the data processing device 304, and prints with the recording device 302.

  The scanner 106 does not have a storage device or a recording device as compared with the color MFP 101, and thus has a configuration as shown in FIG. FIG. 4 is a block diagram showing the configuration of the scanner 106 according to the first embodiment of the present invention. In FIG. 4, an image reading unit 401, a display device 402, a data processing device 403, and an input device 404 are almost the same as the image reading unit 201, the display device 204, the data processing device 205, and the input device 206 in the color MFP 101, respectively. It is. In the scanner 106, the data read by the image reading unit 401 is processed by the data processing unit 403, and the image data is transmitted to the control PC 102 via the USB I / F 405.

  Next, specific processing will be described. In the color image processing system according to the present embodiment, the process is roughly divided into a patch creation process and a conversion LUT creation process. In other words, in the present embodiment, the patch creation process is first performed to create a patch, and the created LUT is created by the conversion LUT creation process using the created patch.

[Patch creation process]
First, the patch creation process will be described. FIG. 5 is a diagram for explaining a patch creation processing procedure in the color image processing system according to the first embodiment of the present invention.

  First, uniform patch data 501 is prepared in the RGB space. The color space of the RGB data may be any as long as it follows a certain rule. FIG. 6 is a diagram illustrating an example of patch data in which RGB are equally allocated. That is, FIG. 6 shows the RGB data in the range of 0-255 equally divided.

  Next, RGB → CMYK conversion for converting RGB data into CMYK data is performed (step 502), and CMYK data 503 is obtained. As long as this conversion is unified by a certain rule, there is no problem even if any method is used, but in this embodiment, description will be made with reference to FIG. 11 as an example.

  FIG. 11 is a diagram for explaining an example of processing when RGB → CMYK conversion is performed. In FIG. 11, CMYKRGB and white (W) are expressed in a cube, and what CMYK values are output for input RGB values are defined for each color. Specifically, four grid points closest to the input RGB value are searched for, and the CMYK value is output by performing an interpolation calculation using a known method using the grid points. Here, the most important value is black (Bk), and the degree of UCR is determined by the definition of the output CMYK value.

  Then, the CMYK data is output from the output device (step 504). Here, any device can be used as long as the output device outputs CMYK data. For example, the color image processing system shown in FIG. Moreover, you may print with an external printing apparatus not shown. By performing the above processing, a print chart (correction chart) 505 can be obtained. This chart is used in the next conversion LUT creation process.

[Conversion LUT creation process]
FIG. 7 is a diagram for explaining a processing procedure for creating a conversion LUT in the color image processing system according to the first embodiment of the present invention. This process is performed on the control PC 102. A print chart 505 shown in FIG. 7 is the print chart 505 created by the patch creation process shown in FIG.

  First, the print chart 505 is read by a scanner (step 701). Here, the scanner to be used may be the scanner unit of the MFP 101 or the scanner 106 connected to the control PC 102. The read data is sent to the control PC 102 as sRGB data 702. Here, since the sRGB data 702 can be converted to L * a * b *, which is a device-independent color space, color space conversion is performed to calculate L * a * b * ′ data 704 (step S703). Note that this data causes a reading error of the scanner, a calculation error in the process of conversion to the L * a * b * space, and the like, so that there is a large deviation from the data measured by the colorimeter. Moreover, the reliability as a value is also low.

  Then, RGB → L * a * b * ′ is created by creating a LUT by taking correspondence between the RGB grid point data 501 used for printing the print chart 505 and the L * a * b * ′ data 704. A conversion LUT 706 is obtained (step 705). The RGB grid point data 501 is the same as the RGB equivalent patch data 501 in FIG. 5 and is arranged in an even manner, so that an LUT can be easily created.

  On the other hand, the print chart 505 is measured using a colorimeter (step 707). L * a * b * data 708 is obtained by the color measurement. The colorimeter is a machine intended to obtain L * a * b * data, and the data is more accurate than a scanner. Therefore, the object of the present invention is achieved by creating an LUT that converts the L * a * b * ′ data 704 calculated by the above-described calculation into L * a * b * data 708.

  Next, an LUT is created using RGB grid point data 501 and L * a * b * data 708 (step 709), and an LUT 710 for performing RGB → L * a * b * ′ conversion is completed.

  In this state, an LUT for converting the target L * a * b * ′ data 704 into L * a * b * data 708 cannot be created. Therefore, the RGB → L * a * b * ′ conversion LUT 706 is inversely converted (step 711) to create an L * a * b * ′ → RGB conversion LUT 712. Here, any method may be used for the inverse transformation.

  Finally, L * a * b * ′ → RGB conversion LUT 712 and RGB → L * a * b * conversion LUT 710 are synthesized (step 713). The output side color space of the L * a * b * ′ → RGB conversion LUT 712 and the input side color space of the RGB → L * a * b * conversion LUT 710 are defined in the same RGB space. Therefore, it is possible to combine them into one LUT. Then, the L * a * b * ′ → L * a * b * conversion LUT 714 is completed.

  Next, an example of processing for converting data read by the scanner into data measured by the colorimeter using the conversion LUT created by the processing shown in FIG. 7 will be described with reference to FIG. FIG. 8 is a diagram for explaining an example of data conversion processing by the conversion LUT created in the first embodiment of the present invention. FIG. 8 assumes an environment in which L * a * b * data of a chart is read using a scanner and a profile is created using the data.

  First, a chart 801 for creating a profile is prepared. It is read by a scanner (step 802), and sRGB data 803 is obtained. Here, the scanner used in the processing described with reference to FIG. 7 is used. Next, color space conversion is performed (step 804), and L * a * b * 'data 805 is obtained. Since this data includes various errors in the same manner as the L * a * b * ′ data 704 described above, it is data with low reliability. The L * a * b * ′ data 805 is interpolated using the L * a * b * ′ → L * a * b * conversion LUT 714 (step 806). As a result, it is converted into L * a * b * data 807. Since this data is associated with the L * a * b * data measured by the colorimeter, the data is highly reliable.

  With the above processing, even if a device such as a scanner has poor color measurement accuracy in the L * a * b * space, a color measurement value equivalent to that of a device having high color measurement accuracy such as a color measurement device can be obtained. Of course, the process using the conversion LUT created in FIG. 7 is not limited to the example of FIG. Further, the patch creation process described with reference to FIG. 5 and the conversion LUT creation process described with reference to FIG. 7 are processes performed as pre-processes in the process of FIG. 8, and need not be recreated each time. However, there is no problem even if patch creation processing / data conversion processing is performed regularly or every time in order to increase accuracy. Also, there is no problem if only the conversion LUT creation process is repeated while omitting only the patch creation process.

  Further, in this embodiment, the RGB grid point data 501 is defined as being equally spaced, but there is no problem as long as there is regularity that allows LUT creation processing.

  Further, in the present embodiment, the conversion is described as an example using the LUT, but there is no problem even if it is replaced by a matrix operation or the like.

<Second Embodiment>
In the second embodiment, an example in which data read from the scanner unit of the color MFP 101 or the scanner 106 cannot be directly converted into L * a * b * will be described. In particular, when the conversion LUT creation processing and data conversion processing in the present invention are integrated in the MFP, data that can be converted into L * a * b * by an operation such as sRGB can be obtained from the scanned data. Not exclusively. Hereinafter, the conversion LUT creation process in such a case will be described with reference to FIG.

  FIG. 9 is a diagram for explaining a conversion LUT creation processing procedure according to the second embodiment of the present invention. In FIG. 9, a print chart 505 is a chart created by the processing shown in FIG. 5 as in the first embodiment described above. This is read by the scanner in the same manner as in FIG. 7 (step 901), and RGB data is acquired. Note that, unlike the first embodiment, this RGB data is data in an RGB space depending on the device. Here, it is defined by the name “d_RGB data 902”.

  Unlike the sRGB data, the d_RGB data 902 cannot be converted into L * a * b * by calculation. Here, the RGB grid point data 501 is the data from which the print chart is created, as in the first embodiment, and the data is evenly arranged. Therefore, the LUT can be easily created in step 903. With this process, an RGB → d_RGB conversion LUT 904 can be performed.

  On the other hand, the print chart 505 is measured with a colorimeter (step 905) to obtain L * a * b * data 906. Then, an LUT is created from RGB grid point data 501 and L * a * b * data 906 (step 907), and an RGB → L * a * b * conversion LUT 908 is created. The purpose of this embodiment is to create an LUT for converting d_RGB directly to L * a * b *. However, data cannot be synthesized only by the RGB → d_RGB conversion LUT 904 and the RGB → L * a * b * conversion LUT 908. Therefore, inverse conversion of RGB → d_RGB conversion LUT is performed to create d_RGB → RGB conversion LUT 910 (step 909). Since the output side color space of the d_RGB → RGB conversion LUT 910 and the input side color space of the RGB → L * a * b * conversion LUT 908 are the same RGB space, two LUTs can be combined into a single LUT. It becomes.

  Finally, a synthesis process is performed (step S911), and the d_RGB → L * a * b * conversion LUT 912 is generated by combining the d_RGB → RGB conversion LUT 910 and the RGB → L * a * b * conversion LUT 908. This LUT is used in actual data conversion processing.

  Next, an example of processing for converting data read from the scanner using the created conversion LUT will be described. FIG. 10 is a diagram for explaining the flow of processing for directly converting device-dependent RGB data read by a scanner using the LUT created in FIG. 9 into device-independent L * a * b * data. is there.

  First, a chart 1001 for use in profile creation is prepared. Here, any chart for creating a profile may be used, and there is no problem not only for creating a profile, but also for any purpose such as use as a substitute for a colorimeter. The profile creation chart 1001 is read by a scanner (step 1002), and RGB data depending on the device is output. Here, this data is defined as d_RGB data 1003. Then, interpolation is performed using the d_RGB data 1003 and the d_RGB → L * a * b * conversion LUT 912 created by the above-described processing (step 1004), and L * a * b * data 1005 is calculated.

  Thus, it is possible to take correspondence even when the read value of the scanner is not directly associated with the device-independent space. As described above, in the present embodiment, an example in which a device-dependent color space is converted to a device-independent color space has been described. In addition to this, there is no problem in any combination of two different color spaces regardless of device dependence or non-dependence, such as conversion from a device-dependent color space to a device-dependent color space.

<Other embodiments>
Although the embodiment has been described in detail above, the present invention can take an embodiment as a system, apparatus, method, program, storage medium (recording medium), or the like. Specifically, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowchart shown in the drawing) that realizes the functions of the above-described embodiments is directly or remotely supplied to a system or apparatus. In addition, this includes a case where the system or the computer of the apparatus is also achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, or the like.

  Examples of the recording medium for supplying the program include the following. Floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD-R) .

  As another program supply method, the program can be supplied by downloading it from a homepage on the Internet to a recording medium such as a hard disk using a browser of a client computer. That is, it connects to a homepage and downloads the computer program itself of the present invention or a compressed file including an automatic installation function from the homepage. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  Further, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, and distributed to users. Then, the user who has cleared the predetermined condition is allowed to download key information for decryption from the homepage via the Internet. It is also possible to execute the encrypted program by using the key information and install the program on a computer.

  Further, the functions of the above-described embodiments are realized by the computer executing the read program. In addition, the function of the above-described embodiment can be realized by an OS running on the computer based on an instruction of the program and performing part or all of the actual processing.

  Further, the functions of the above-described embodiments are realized even after the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. That is, the functions of the above-described embodiments are realized by performing a part or all of the actual processing by the CPU or the like provided in the function expansion board or function expansion unit based on the instructions of the program.

1 is a block diagram illustrating a configuration of a color image processing system according to a first embodiment of the present invention. 1 is a block diagram showing a configuration of a color MFP 101 according to a first embodiment of the present invention. 1 is a block diagram illustrating a configuration of a printer 107 according to a first embodiment of the present invention. 1 is a block diagram illustrating a configuration of a scanner according to a first embodiment of the present invention. It is a figure for demonstrating the patch creation processing procedure in the color image processing system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the patch data which allocated RGB equally. It is a figure for demonstrating the process sequence for producing the conversion LUT in the color image processing system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the example of a data conversion process by the conversion LUT produced in the 1st Embodiment of this invention. It is a figure for demonstrating the conversion LUT creation processing procedure in the 2nd Embodiment of this invention. It is a figure for demonstrating the flow of the process which converts directly the device dependent RGB data read with the scanner using the LUT produced in FIG. 9 into L * a * b * data which do not depend on a device. It is a figure for demonstrating the process example at the time of performing RGB-> CMYK conversion.

Explanation of symbols

101 color MFP
102 PC for control
103, 108 Cable 104 Colorimeter 105 Network 106 Scanner 107 Printer

Claims (12)

A correction chart in which first color data defined in an arbitrary color space arranged according to a predetermined rule is formed by an output device is read by the first input device, and the color of the first input device is read Reading means for obtaining second color data defined in space;
First creating means for creating a first module for converting the first color data into the second color data;
A second module for converting the first color data into third color data defined in a color space of the second input device obtained by reading the correction chart with a second input device; A second creation means for creating;
And a third creating means for creating a third module for combining the first and second modules to convert the second color data into the third color data. Image processing device.   Color data obtained by reading a profile creation chart for creating profile data with the first input device is converted into color data defined in the color space of the second input device using the third module. The image processing apparatus according to claim 1, further comprising conversion means for converting.   2. The third module according to claim 1, wherein the third module creates the third module by reversely converting the color data conversion process in the first module and combining it with the second module. 2. The image processing apparatus according to 2.   The reading means reads the correction chart obtained by outputting the first color data, in which data values are arranged at equal intervals, from the output device, using the first input device. The image processing apparatus according to any one of the above.   5. The apparatus according to claim 1, further comprising an output unit that converts the first color data into data in a color space depending on the output device and outputs the correction chart. 6. The image processing apparatus described.   The reading means reads the correction chart by the first input device, and the first input by the second color data defined by a color space that does not depend on the first input device or by calculation. The image processing apparatus according to claim 1, wherein the second color data that can be converted into data defined in a color space that does not depend on a device is obtained.   The reading means reads the correction chart with the first input device, and obtains the second color data defined in a color space depending on the first input device. The image processing apparatus according to 1. The first creating means creates a look-up table for converting the first color data into the second color data as the first module,
The second creation means creates a look-up table for converting the first color data into the third color data as the second module,
2. The image processing according to claim 1, wherein the third creating unit creates a look-up table for converting the second color data into the third color data as the third module. 3. apparatus. The first creating means creates a determinant for converting the first color data into the second color data as the first module,
The second creation means creates a determinant for converting the first color data into the third color data as the second module,
The image processing apparatus according to claim 1, wherein the third creating unit creates a determinant for converting the second color data into the third color data as the first module. .   The second creation means converts the first color data into the third color data defined in a device-independent color space obtained by measuring the correction chart with a colorimeter. The image processing apparatus according to claim 1, wherein a second module is created. A correction chart in which first color data defined in an arbitrary color space arranged according to a predetermined rule is formed by an output device is read by the first input device, and the color of the first input device is read A reading step of obtaining second color data defined in space;
A first creation step of creating a first module for converting the first color data into the second color data;
A second module for converting the first color data into third color data defined in a color space of the second input device obtained by reading the correction chart with a second input device; A second creation step to create;
And a third creation step of creating a third module for combining the first and second modules to convert the second color data into the third color data. Image processing method. On the computer,
A correction chart in which first color data defined in an arbitrary color space arranged according to a predetermined rule is formed by an output device is read by a first input device, and the first chart is read into the computer. A reading procedure for obtaining second color data defined in the color space of the input device;
A first creation procedure for creating a first module for converting the first color data into the second color data;
A second module for converting the first color data into third color data defined in a color space of the second input device obtained by reading the correction chart with a second input device; A second creation procedure to create;
And a third creation procedure for creating a third module for combining the first and second modules to convert the second color data into the third color data.

Images