JP2003078774A - Color adjustment method, program for implementing the color adjustment method and medium for storing the program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color adjustment method that causes no color change due to tone jump or smoothing by color conversion when an image subjected to color conversion is outputted from a calibration color printer. SOLUTION: Concerning a target first color image output device and a second color image output device for reproducing the colors of the first color image output device, the color profile of each of the color image output devices or the color profile between both image output devices is subjected to smoothing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention creates a first color profile representing a relationship between a value of four colors or three colors and a value of a color system for two color image output devices, and creates two color profiles of the two. A color adjusting method for performing color reproduction by a first color profile or a second color profile created by using the two first color profiles, a program for executing this color adjusting method, and a program. The present invention relates to a stored recording medium.

[0002]

2. Description of the Related Art Conventionally, in a dot type color proof printer, the color of each color material of CMYK is close to the printing ink color, and therefore, the difference in the dot thickening is corrected (dot gain curve correction).
Was performed based on the measurement result of the dot area ratio for each of CMYK, it was possible to match the color to the printing machine to some extent. However, the secondary colors of red R, green G, and blue B, the black of three CMY colors, and CMY
Regarding the black of K4 color and the colors in the vicinity thereof, the color appearance differs from that of the printing machine, and it is difficult to perform strict color matching.
Therefore, a color management system based on a device color profile has been proposed, and it has become possible to accurately match the color of the proof color printer with the color of the printing machine.

[0003]

However, CMYK is converted into a color system value by the device color profile of the conventional printing machine, and the color system value is converted into CMYK by the device color profile of the proof color printer. According to the method, when a continuous tone portion such as white to red and red to black is color-converted and output by a proof color printer, a tone jump in which the continuity of lightness and saturation changes may occur.

Further, in order to reduce the tone jump, smoothing processing may be performed at the time of creating the device color profile. In the smoothing processing,
Depending on the processing method, for example, a color change may occur in an average of 3 × 3 × 3 = 27 points surrounding a certain point in a three-dimensional direction.

The present invention has been made in view of the above circumstances, and an object thereof is a color adjusting method which does not cause a tone jump or a color change when the color is converted and output by a color printer for calibration. To provide.

[0006]

The present invention takes the following means in order to solve the above problems.

That is, the color adjusting method according to claim 1 is
A first color image output device which is a target of color matching, and a first lookup table including a first lookup table in which a color system value is stored as an output value for an input value of a combination of four or three basic colors Of the second color image output device that creates a color profile of the target color and reproduces the target color, and the values of the four or three basic colors are stored as the output values for the input values of the combination of the values of the color system. A first color profile including a second look-up table, and a second color profile is created so that an output suitable for the first color image output device can be obtained by the second color image output device. 4 colors or 3 for output by the first color image output device, which is created based on the first color profile or the two first color profiles The base color combination the color profile that contains the value of the combination of four colors or three basic colors as an output value for an input value of the image data in the color adjustment method for performing color conversion, said first
Value of the color system for a certain combination of four or three basic colors in the first lookup table of the first color profile of the color image output device of
4 colors or 3 in the first lookup table
It is characterized by being created by averaging the values of the color system for three or more points including the points before and after the certain direction of the basic color in the lightness direction.

According to a second aspect of the present invention, there is provided a color adjusting method according to the first color image output device which is a target of color matching.
Create a first color profile that includes a first look-up table that stores color system values as output values for input values of a color or a combination of three basic colors, and reproduce the target color. For the second color image output device, a first color profile including a second look-up table in which the values of the basic colors of four colors or three colors are stored as the output values for the input values of the combination of the values of the color system Each of the two first color profiles is created so that an output suitable for the first color image output device can be obtained by the second color image output device.
Or, four or three colors as output values for input values of a combination of four basic colors or three basic colors for output in the first color image output device created based on two first color profiles In the color adjusting method for performing color conversion on image data according to a color profile that stores the value of a combination of basic colors, a table in the second look-up table of the first color profile of the second color image output device. The values of four or three basic colors for a certain combination of color system values are for three or more points including points before and after the certain color combination values of the second lookup table in the lightness direction. It is characterized in that it is created by averaging the values of four or three basic colors.

According to a third aspect of the present invention, there is provided a color adjusting method according to the first color image output device which is a target of color matching.
Create a first color profile that includes a first look-up table that stores color system values as output values for input values of a color or a combination of three basic colors, and reproduce the target color. For the second color image output device, a first color profile including a second look-up table in which the values of the basic colors of four colors or three colors are stored as the output values for the input values of the combination of the values of the color system Respectively, and based on the two first color profiles, the second color image output device outputs the second color as an output value for an input value of a combination of four or three basic colors for output. A second color profile that stores the values of four or three basic colors for output in the color image output device was created and matched with the color of the first color image output device. In the color adjusting method for performing color conversion on image data by the second color profile so that the force can be obtained by the second color image output device, the first color image in the second color profile The value of the four or three basic colors for output on the second color image output device for a certain combination of the four or three basic colors for output on the output device is the first color image. 4 colors or 3 for output on the output device
Created by averaging the values of four or three basic colors for output in the second color image output device with respect to three or more points including points before and after the certain basic color in the lightness direction. It is characterized by being done.

According to a fourth aspect of the present invention, there is provided a color adjusting method for a first color image output device which is a target of color matching.
Create a first color profile that includes a first look-up table that stores color system values as output values for input values of a color or a combination of three basic colors, and reproduce the target color. For the second color image output device, a first color profile including a second look-up table in which the values of the basic colors of four colors or three colors are stored as the output values for the input values of the combination of the values of the color system Each of the two first color profiles is created so that an output suitable for the first color image output device can be obtained by the second color image output device.
Or, four or three colors as output values for input values of a combination of four basic colors or three basic colors for output in the first color image output device created based on two first color profiles In the first look-up table of the first color profile of the first color image output device in the color adjusting method for performing color conversion on image data with a color profile storing a value of a combination of basic colors of The value of the color system for a certain combination of colors or three basic colors is 3 or more including the points before and after the lightness direction of the certain combination of the four or three basic colors in the first lookup table. Is generated by averaging the values of the color system for the second color image output device and the second color image of the second color image output device. The values of the four or three basic colors for a certain combination of color system values in the lookup table are the points before and after the lightness direction of the certain combination of color system values in the second lookup table. It is characterized in that it is created by averaging the values of four basic colors or three basic colors for three or more points included.

According to a fifth aspect of the present invention, there is provided a color adjustment method according to the first color image output device which is a target of color matching.
Create a first color profile that includes a first look-up table that stores color system values as output values for input values of a color or a combination of three basic colors, and reproduce the target color. For the second color image output device, a first color profile including a second look-up table in which the values of the basic colors of four colors or three colors are stored as the output values for the input values of the combination of the values of the color system Respectively, and based on the two first color profiles, the second color image output device outputs the second color as an output value for an input value of a combination of four or three basic colors for output. A second color profile that stores the values of four or three basic colors for output in the color image output device was created and matched with the color of the first color image output device. In the color adjusting method for performing color conversion on image data according to the second color profile so that the force can be obtained by the second color image output device, the first color of the first color image output device can be obtained. The value of the color system for a certain combination of four or three basic colors in the first look-up table of the profile is the value of the certain combination of four or three basic colors in the first look-up table. Four or three colors for output in the first color image output device in the second color profile are created by averaging values of the color system for three or more points including points before and after the lightness direction. Values of the four or three basic colors for output in the second color image output device for a certain combination of basic colors of the first color image output 4 for output in the location
Average values of four or three basic colors for output in the second color image output device with respect to three or more points including points before and after in the lightness direction of the certain combination of colors or three basic colors It is characterized by being created by.

According to a sixth aspect of the present invention, there is provided a color adjusting method according to the first color image output apparatus which is a target of color matching.
Create a first color profile that includes a first look-up table that stores color system values as output values for input values of a color or a combination of three basic colors, and reproduce the target color. For the second color image output device, a first color profile including a second look-up table in which the values of the basic colors of four colors or three colors are stored as the output values for the input values of the combination of the values of the color system Respectively, and based on the two first color profiles, the second color image output device outputs the second color as an output value for an input value of a combination of four or three basic colors for output. A second color profile that stores the values of four or three basic colors for output in the color image output device was created and matched with the color of the first color image output device. In the color adjusting method for performing color conversion on image data according to the second color profile so that the force can be obtained by the second color image output device, the first color of the second color image output device can be obtained. The values of the four or three basic colors for the certain combination of the color system values in the second lookup table of the profile are the lightness of the certain combination of the color system values in the second lookup table. It is created by averaging the values of four basic colors or three basic colors for three or more points including points before and after the direction, and four values for output in the first color image output device in the second color profile. The values of the four or three basic colors for output in the second color image output device for a certain combination of colors or three basic colors are the first color Four colors for output by the second color image output device for three or more points including four points before and after the certain combination of the four basic colors or three basic colors for output by the image output device, or It is characterized by being created by averaging the values of the three basic colors.

According to a seventh aspect of the present invention, there is provided a color adjusting method according to the first color image output device which is a target of color matching.
Create a first color profile that includes a first look-up table that stores color system values as output values for input values of a color or a combination of three basic colors, and reproduce the target color. For the second color image output device, a first color profile including a second look-up table in which the values of the basic colors of four colors or three colors are stored as the output values for the input values of the combination of the values of the color system Respectively, and based on the two first color profiles, the second color image output device outputs the second color as an output value for an input value of a combination of four or three basic colors for output. A second color profile that stores the values of four or three basic colors for output in the color image output device was created and matched with the color of the first color image output device. In the color adjusting method for performing color conversion on image data according to the second color profile so that the force can be obtained by the second color image output device, the first color of the first color image output device can be obtained. The value of the color system for a certain combination of four or three basic colors in the first look-up table of the profile is the value of the certain combination of four or three basic colors in the first look-up table. The color in the second lookup table of the first color profile of the second color image output device is created by averaging the values of the color system for three or more points including points before and after the lightness direction. The values of the four or three basic colors for a certain combination of system values are before the values of the color system in the second lookup table. It is created by averaging the values of four or three basic colors for three or more points including points before and after the certain direction in the lightness direction, and in the second color profile, in the first color image output device. The values of the 4 or 3 basic colors for output in the second color image output device for a certain combination of 4 or 3 basic colors for output are the same as those in the first color image output device. Four or three colors for output in the second color image output device with respect to three or more points including front and back points in the lightness direction of the certain combination of four or three basic colors for output
It is characterized by being created by averaging the values of basic colors.

The color adjusting method according to claim 8 is a program for causing a computer to execute the color adjusting method according to any one of claims 1 to 7.

A color adjusting method according to a ninth aspect is a computer-readable storage medium storing the program according to the eighth aspect.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below with reference to FIGS. 1 to 17.

FIG. 17 shows an embodiment of the structure for carrying out the color adjustment of the present invention. As shown in FIG.
It is composed of a personal computer 10 and a color printer 20 for calibration. The personal computer 10 includes an arithmetic processing unit 11 which is a microprocessor, a first storage unit 12 which is a memory, a second storage unit 13 which is a hard disk, an interface 14 which is a communication means with the outside, a display unit 15 which is a display, and a keyboard. The operation unit 16 and the internal bus 17 that enables them to communicate. Further, the personal computer 10 and the proof color printer are connected by a bus 30 for enabling transfer of image information and the like.

Various look-up tables, which will be described later, are stored in the second storage unit 13 and serve to perform color conversion of image data when a color image is output by the proof color printer 20 using a printer driver. To do.

FIG. 1 is a flowchart showing each step of the color adjusting method according to the embodiment of the present invention. This color adjusting method is executed such that the printing machine (first color image output apparatus) is the target of color matching and the colors of the printing machine are reproduced by the proof color printer (second color image output apparatus). It is something.

First, each step of the color adjusting method according to the present embodiment will be schematically described with reference to FIG.

First, the color chart of the printed matter output by the printing machine is measured (S21a), and a device color profile (first color profile) is created based on this (S22a). On the other hand, the color chart of the proof output product output by the proof color printer is measured (S
21b), and based on this, a device color profile (first color profile) is created (S22).
b). Further, the device color profile of the printing press and the device color profile of the proof color printer are smoothed (S23a, S23).
b). Next, a lookup table that is a device link color profile (second color profile) is created from the device color profile of the printing press and the device color profile of the proof color printer (S24). Further, the device link color profile is smoothed (S25). Finally, the image data is color-corrected pixel by pixel according to the device link color profile to obtain the CMYK values to be output to the calibration color printer and output from the calibration color printer (S26).

Next, the contents of the device color profile and the method of creating the device color profile will be described with reference to FIGS. The smoothing of the device link color profile (S25) and the smoothing of the device link color profile (S25) will be described later.

The device color profile of each of the above-mentioned printing machine and proof color printer is composed of the following two lookup tables (hereinafter referred to as "LUT"). CMYK → L * a * b * LUT L * a * b * → CMYK LUT CMYK → L * a * b * LUT converts CMYK color values into color system values L * a * b *. L * a * b * →
The CMYK LUT uses the color system values L * a * b * as CMY
Convert to K color value.

L * a * b * → CMYK LUT is L * a
Since the color reproducible range of CMYK mixed colors by the device is limited in the * b * full color space, how to map the L * a * b * full color space within the color reproducible range? It is general to change several types, to have a plurality of types, and to select and use according to the type of input device.

The CMYK → L * a * b * LUT is, for example, as shown in FIG. 2, and is a four-dimensional input / 3-dimensional output in which L * a * b * values are input to the CMYK LUT input points. Specifically, color patches are measured with a colorimeter for a large number of combinations of all color spaces of CMYK, and L * a * b * values of each color patch are obtained to be an LUT. For example, the following method is used. I can decide.

That is, the minimum value 0 of each of C, M, Y and K
To 255 are divided into four, 0, 64, 128, 19
There are 5 stages of 1, 255, and C × M × Y × K: 5 × 5 ×
A color chart as shown in FIG. 3 in which color patches are arranged for a combination of 5 × 5 = 625 points is printed by a printing machine or a calibration color printer, and each patch of 5 × 5 × 5 × 5 = 625 points is sequentially measured. Then, the L * a * b * value is determined.

Further, a four-dimensional input / three-dimensional output LUT
Is 5 × 5 for points between 9 × 9 × 9 × 9 grid points.
Each patch of x5x5 = 625 points is converted into each patch of 9x9x9x9 by performing interpolation. As shown in FIG. 4, if black circles ● are grid points (sample points) and triangles and triangles are points to be interpolated, respectively, there are two grid points before and after the triangle, as in the case of triangle. Different interpolation formulas are used when there are one point and three points before and after as shown by a mark.

Here, the color system of the points to be interpolated is Lm * am
* Bm * and the color system of each sample point is Li * ai * b
When i * (i = 1 to 4), in the former case (marked with Δ), the following interpolation formula is used: Lm * =-(1/16) L1 ** + (9/16) L2 **
(9/16) L3 *-(1/16) L4 * am * =-(1/16) a1 * + (9/16) a2 **
(9/16) a3 *-(1/16) a4 * bm * =-(1/16) b1 * + (9/16) b2 ** +
It is interpolated as (9/16) b3 *-(1/16) b4 *.

In the latter case (marked with X), Lm * = (5/16) L1 * + (15/16) L2 *-
(5/16) L3 *-(1/16) L4 * am * = (5/16) a1 ** + (15/16) a2 *-
(5/16) a3 *-(1/16) a4 * bm * = (5/16) b1 ** + (15/16) b2 *-
It is interpolated as (95/16) b3 *-(1/16) b4 *.

FIG. 5 shows an example of the order of interpolation processing for the three-dimensional CMY. The CMY5 × 5 × 5 is interpolated into 9 × 9 × 9 by performing the interpolation process in the order shown in FIG. 5 (corresponding to Roman numerals in FIG. 5). Furthermore, after performing interpolation of CMY5 × 5 × 5 to 9 × 9 × 9 for all five levels, for each point of CMY9 × 9 × 9, calculation for interpolating 5 points of K into 9 points is performed. The method is the same as that shown in FIG. This actually gives 5x
Despite measuring only 5 × 5 = 625 points of patches, it is possible to extend to 9 × 9 × 9 = 6561 points and obtain L * a * b * values for CMYK combinations.

On the other hand, L * a * b * → CMYK LUT
Is a three-dimensional input / four-dimensional output LUT as shown in FIG. 6, and transforms by interpolating points between 33 × 33 × 33 lattice points.

As shown in FIG. 7, the method for obtaining the three-dimensional input / 4-dimensional output LUT is as follows.
It is composed of 04. For simplicity, the basic colors are C and M, 2
Described as a color. Note that C, M, Y, and K are all 0
It shall take the value of ~ 255.

(Step S01) CMYK → L * described above
a * b * LUT (1) C × M × Y × K: 9 × 9 × 9
The four-dimensional data, which is the L * a * b * value for x9, is converted into the three-dimensional data, which is the L * a * b * value for CxMxY: 9x9x9. For this purpose, the method described in the specification of the applicant's patent No. 2898030 can be used. For example, when K is added to emphasize the gray component obtained from the minimum value of CMY, K is obtained based on the minimum value of CMY, and L * a * b in the case where the K is added to CMY.
* Perform by obtaining the value.

K can be obtained by the following equation.
Assuming that the minimum value of CMY is min [C, M, Y], K = 1.6 (min [C, M, Y] -128) However, if K <0, then K = 0.

The L * a * b * value when this K is added to CMY can be obtained, for example, as follows. Taking the case of C = M = Y = 191 as an example, K =
1.6 * (191-128) = 101, and this 10
1 is C × M × Y × K: 9 points of 9 × 9 × 9 × 9 K (0,
32, 64, 96, 128, 159, 191, 223,
255) between the fourth 96 and the fifth 128, C = M = Y = 191 in the 9 × 9 × 9 × 9 points.
(7th point), L = a * b * value of K = 96 (4th point), C = M = Y = 191 (7th point), C = M = Y = 19
L * a * b of 1 (7th point) and K = 128 (5th point)
* Calculate by interpolating from two values. C = M = Y = 19
The weight w1 for L1 * a1 * b1 *, which is the L * a * b * value of 1 (7th point) and K = 96 (4th point), is w1 =
C as 1.0- (101-96) / (128-96)
= M = Y = 191 (7th point), K = 128 (5th point) L * a * b * L2 * a2 * b2 * weight w2, w2 = (101-96) / (128-96)
Then, L * a * b * value after interpolation, Lm * am * bm
* Can be obtained by Lm * = w1 * L1 * + w2 * L2 * am * = w1 * a1 * + w2 * a2 * bm * = w1 * b1 * + w2 * b2 *.

This is the case of C = M = Y = 191, but by performing this for C × M × Y: 9 × 9 × 9 = 729 points, C × M × Y × K: 9 × 9 x 9 x 9 of 4
Three-dimensional data of C × M × Y: 9 × 9 × 9 can be created from the dimensional data.

(Step S02) Next, step S01
C × M × Y: using 9 × 9 × 9 three-dimensional data, L
Calculate * a * b * → CMYK LUT (2). Figure 8
Is a two-dimensional 9 × 9 combination of M and C in CMY (Y =
0) is a plot of L * on the vertical axis and a * on the horizontal axis. Although it is actually three-dimensional, it is shown in two dimensions for simplicity.

For this CMY distribution, the target point [L * (0-100) a * (-127-
128) b * (-127 to 128): 33 × 33 × 33
= 35937 each LUT input point], L * a * b * is given as a target value T ′. When the target value T'is in the region surrounded by the grid points a'to d'as shown in FIG. 8, the MC combination (target value T) in the MC coordinate system is the grid points a to d'as shown in FIG. It is presumed to be within the area surrounded by d. Then, the location of the target value T in the area formed by the grid points a to d is obtained by performing a convergence calculation process while associating the color system of FIG. 8 with the coordinate system of FIG. Although the conversion from the coordinate system of FIG. 9 to the color system of FIG. 8 is known, the reverse conversion is very complicated and a good conversion formula is known. This is because it has not been done.

Next, the area S0 formed by the grid points a to d in FIG. 10 is equally divided into four areas S1 to S4. 5
The individual division points e to i are calculated by weighted averaging using the already obtained surrounding grid points. Then, the values obtained by converting the values corresponding to the division points e to i into the L * a * b * color system are plotted in the color system of FIG. 11, and the plotted division points e ′ to i ′ are used. Four areas S formed
Which region of 1'-S4 'has the target value T'is determined. As shown in FIG. 11, when in the area S2 ',
As shown in FIG. 10, the target value T is S corresponding to the area S2 ′.
It is presumed to be in 2.

Next, the estimated area S2 is equally divided into S5 to S8. The five division points j to n are calculated by weighted averaging using the already obtained surrounding grid points or division points. Then, the value corresponding to the division points j to n is set to L * a.
The values converted to the * b * color system are plotted in the color system of FIG. 11, and in which of the four areas S5 ′ to S8 ′ formed by the plotted dividing points j ′ to n ′. Determine if there is a target value T '. Area S as shown in FIG.
When it is 8 ', the target value T is estimated to be in the area S8 corresponding to the area S8' as shown in FIG.

Next, the estimated area S8 is equally divided into four areas S9 to S12. The five division points o to s are calculated by weighted averaging using the already obtained surrounding grid points or division points. Then, the values obtained by converting the values corresponding to the division points o to s into the L * a * b * color system are plotted in the color system of FIG. 11, and the plotted division points o ′
~ S 'four regions S9'-S12' formed by
In which of the areas the target value T'is located is determined. Figure 11
When the target value T is in the area S10 'as shown in FIG. 10, the target value T is the area S10 corresponding to the area S10'.
Presumed to be in.

By repeating the division of the region as described above, the lattice gradually becomes smaller and finally converges. Then, the target value T is obtained by averaging the four lattice points or the division points forming the converged area, and thus the combination of the basic colors indicating the output colors to be obtained can be obtained.

Further, in the present embodiment, the method based on the convergence calculation as described above is described.
An interpolation method as described in the specification of 895086 may be used.

By the way, when the target value T'is outside the color reproduction range formed by the vertices W ', C', M ', B'of the L * a * b * color system as shown in FIG. It is necessary to move this target value T'to the color reproduction range. In this case, the target value T ′ is moved in the achromatic color direction, and the coordinates of the intersection with the boundary of the color reproduction range in the achromatic color direction is set as the target value, as shown in FIG. A target value T to be calculated is calculated.

The target value T ′ does not necessarily have to be moved to the boundary, but may be moved within the color reproduction range. Also, here, for the sake of explanation, the example of the two-dimensional C × M is shown, but actually, the three-dimensional C × M × Y is used.
It is necessary to calculate the values of C, M, and Y one by one with each LUT input point of 33 * 33 * 33 points of L * a * b * as a target value T '.

(Step S03) C for 33 * 33 * 33 points of L * a * b * obtained in Step S02,
M and Y are C × M × Y obtained in the first step: 9 × 9 ×
CMY corresponding to the three-dimensional data of 9, and K is obtained from CMY by the same method as in the first step. K = 1.6 (min [C, M, Y] -128) However, if K <0, then K = 0.

Step S04 The CMYK values for the 33 × 33 × 33 LUT input points of L * a * b * obtained as described above are converted into LUTs.

Further, smoothing of each LUT is performed, and smoothing will be described later.

Next, the contents of the device link color profile and the method of creating the device link color profile will be described with reference to FIGS.

The device link color profile is, for example, C × M × Y × K: 21 × 21 × as shown in FIG.
CM for 21 × 21 = 194481 LUT input points
A four-dimensional input / four-dimensional output LUT in which YK values are entered, and can be created as follows, for example.

Using the CMYK → L * a * b * LUT in the device color profile of the printing machine and the L * a * b * → CMYK LUT in the calibration color printer,
C, M, Y, K, each of 0 to 255 divided into 20 equal parts 2
C × M × Y × K of one point combination: 21 × 21 × 21 × 2
1 = 194481 points are input values, and a four-dimensional input / four-dimensional output LUT in which CMYK values to be output to the calibration color printer are input as output values for each point is calculated.

C × M × Y × K: 21 × 21 × 21 × 21
= 194481 points are calculated as follows for each one of the input points. The following steps S11 to S13 of FIG.
Described in.

(Step S11) First, CMYK → L * a * b * L in the device color profile of the printing press.
Determine L * a * b * using UT. C = 25.5 (0
~ 20 2), M = 51 (0-20 4), Y = 19
Taking the points of 1.25 (4 from 0 to 20) and K = 76.5 (6 from 0 to 20) as an example, CMYK: 9 × 9 × 9 × 9 → L
CMYK of the * a * b * LUT: The distance between the input points within 9 × 9 × 9 × 9 and the input points of each of CMYK is C: 25.5 / 255 × 8 = 0.8, so 1 of C The distance DC1 to the first point C1 and C1 and the second point C2 of C
And the distance DC2 to C2 is C1 = 0, DC1 = 0, C2
= 1, DC1 = 0.2 M: 51/255 × 8 = 1.6, so the distance DM1 to the first point M1 of M and M1 and the second point M2 and M of M
The distance DM2 to 2 is M1 = 1, DM1 = 0.6, M2
= 1, DM1 = 0.4 Y: 191.5 / 255 × 8 = 6, so the distance Y1 to the first point Y1 and Y1 and the distance Y2 to the second point Y2 and Y2 For DY2, Y1 = 6, DY1 = 0, Y2 =
7, DY1 = 1.0 K: 76.5 / 255 × 8 = 2.4, so the first point K1 of K and the distance DK1 to K1 and the second point K2 of K
And the distance DK2 to K2 is K1 = 2, DK1 = 0.4,
K2 = 3 and DK2 = 0.6.

CMYK → L * a * b * LUT C2 points (C1, C2) × M2 points (M1, M2) × Y
The values of the L * a * b * color system for 2 points (Y1, Y2) × K2 points (K1, K2) = 16 points are Lc1m1y1k1 *, Lc1m1y1k2 *, Lc1.
m1y2k1 *, Lc1m1y2k2 *, Lc1m2y
1k1 *, Lc1m2y1k2 *, Lc1m2y2k1
*, Lc1m2y2k2 *, Lc2m1y1k1 *, L
c2m1y1k2 *, Lc2m1y2k1 *, Lc2m
1y2k2 *, Lc2m2y1k1 *, Lc2m2y1
k2 *, Lc2m2y2k1 *, Lc2m2y2k2
*, Ac1m1y1k1 *, ac1m1y1k2 *, a
c1m1y2k1 *, ac1m1y2k2 *, ac1m
2y1k1 *, ac1m2y1k2 *, ac1m2y2
k1 *, ac1m2y2k2 *, ac2m1y1k1
*, Ac2m1y1k2 *, ac2m1y2k1 *, a
c2m1y2k2 *, ac2m2y1k1 *, ac2m
2y1k2 *, ac2m2y2k1 *, ac2m2y2
k2 *, bc1m1y1k1 *, bc1m1y1k2
*, Bc1m1y2k1 *, bc1m1y2k2 *, b
c1m2y1k1 *, bc1m2y1k2 *, bc1m
2y2k1 *, bc1m2y2k2 *, bc2m1y1
k1 *, bc2m1y1k2 *, bc2m1y2k1
*, Bc2m1y2k2 *, bc2m2y1k1 *, b
c2m2y1k2 *, bc2m2y2k1 *, bc2m
2y2k2 *, C = 25.5 (2 from 0 to 20), M = 51
L * a for (4 from 0 to 20), Y = 191.25 (4 from 0 to 20), K = 76.5 (6 from 0 to 20)
The value of the * b * color system is obtained by the following formula: L * = DC2 × DM2 × DY2 × DK2 × Lc1m1y
1k1 * + DC2 × DM2 × DY2 × DK1 × Lc1m
1y1k2 * + DC2 × DM2 × DY1 × DK2 × Lc
1m1y2k1 * + DC2 × DM2 × DY1 × DK1 ×
Lc1m1y2k2 * + DC2 × DM1 × DY2 × DK
2 x Lc1m2y1k1 * + DC2 x DM1 x DY2 x
DK1 x Lc1m2y1k2 * + DC2 x DM1 x DY
1 x DK2 x Lc1m2y2k1 * + DC2 x DM1 x
DY1 × DK1 × Lc1m2y2k2 * + DC1 × DM
2 x DY2 x DK2 x Lc2m1y1k1 * + DC1 x
DM2 x DY2 x DK1 x Lc2m1y1k2 * + DC
1 x DM2 x DY1 x DK2 x Lc2m1y2k1 **
DC1 x DM2 x DY1 x DK1 x Lc2m1y2k2
* + DC1 x DM1 x DY2 x DK2 x Lc2m2y1
k1 * + DC1 × DM1 × DY2 × DK1 × Lc2m2
y1k2 * + DC1 × DM1 × DY1 × DK2 × Lc2
m2y2k1 * + DC1 × DM1 × DY1 × DK1 × L
c2m2y2k2 * a * = DC2 × DM2 × DY2 × DK2 × ac1m1y
1k1 * + DC2 × DM2 × DY2 × DK1 × ac1m
1y1k2 * + DC2 × DM2 × DY1 × DK2 × ac
1m1y2k1 * + DC2 × DM2 × DY1 × DK1 ×
ac1m1y2k2 * + DC2 × DM1 × DY2 × DK
2 x ac1m2y1k1 * + DC2 x DM1 x DY2 x
DK1 x ac1m2y1k2 * + DC2 x DM1 x DY
1 x DK2 x ac1m2y2k1 * + DC2 x DM1 x
DY1 × DK1 × ac1m2y2k2 * + DC1 × DM
2 x DY2 x DK2 x ac2m1y1k1 * + DC1 x
DM2 x DY2 x DK1 x ac2m1y1k2 * + DC
1 x DM2 x DY1 x DK2 x ac2m1y2k1 **
DC1 x DM2 x DY1 x DK1 x ac2m1y2k2
* + DC1 x DM1 x DY2 x DK2 x ac2m2y1
k1 * + DC1 × DM1 × DY2 × DK1 × ac2m2
y1k2 * + DC1 × DM1 × DY1 × DK2 × ac2
m2y2k1 * + DC1xDM1xDY1xDK1xa
c2m2y2k2 * b * = DC2 × DM2 × DY2 × DK2 × bc1m1y
1k1 * + DC2 × DM2 × DY2 × DK1 × bc1m
1y1k2 * + DC2 × DM2 × DY1 × DK2 × bc
1m1y2k1 * + DC2 × DM2 × DY1 × DK1 ×
bc1m1y2k2 * + DC2 × DM1 × DY2 × DK
2 × bc1m2y1k1 * + DC2 × DM1 × DY2 ×
DK1 x bc1m2y1k2 * + DC2 x DM1 x DY
1xDK2xbc1m2y2k1 * + DC2xDM1x
DY1 × DK1 × bc1m2y2k2 * + DC1 × DM
2 x DY2 x DK2 x bc2m1y1k1 * + DC1 x
DM2 x DY2 x DK1 x bc2m1y1k2 * + DC
1 x DM2 x DY1 x DK2 x bc2m1y2k1 **
DC1 x DM2 x DY1 x DK1 x bc2m1y2k2
* + DC1 x DM1 x DY2 x DK2 x bc2m2y1
k1 * + DC1 × DM1 × DY2 × DK1 × bc2m2
y1k2 * + DC1 × DM1 × DY1 × DK2 × bc2
m2y2k1 * + DC1 × DM1 × DY1 × DK1 × b
It becomes c2m2y2k2 *.

(Step S12) Next, step S11
The value of the L * a * b * color system obtained in step L * a * b * of the device color profile of the calibration color printer → CM
CMYK is obtained using the YK LUT. For example, the value of the L * a * b * color system obtained in step S11 is L * =
57,0, a * = 5.3, b * = 35.6, L
* A * b *: 33 x 33 x 33 → L of CMYK LUT
* A * b *: 33 × 33 × 33 input points and L * a * b
* The distance to each input point is L *: 57,0 / 100 × 32 = 18.2, so L *
The distance DL1 to the first points L1 and L1 of L1 and the distance DL2 to the second points L2 and L2 of L * are L1 = 18, DL
1 = 0.2, L2 = 19, DL2 = 0.8 a *: (5.3 + 127) /255×32=16.6, so the first point a1 of a * and the distance DL1 to a1 are:
The distance Da2 between the second point a2 of a * and a2 is a1 =
16, Da1 = 0.6, a2 = 17, Da2 = 0.4 b *: (35.6 + 127) /255×32=20.4
Therefore, the distance DL1 to the first point b1 of b * and b1
And the distance Db2 to the second point b2 of b * and b2 is b
1 = 20, Db1 = 0.4, b2 = 21, Db2 = 0.
It becomes 6.

L * a * b *: 33 × 33 × 33 → CMY
The CMYK values for L * 2 points (L1, L2) × a * 2 points (a1, a2) × b * 2 points (b1, b2) = 8 points from the K LUT are CL1a1b1, CL1a1b2, CL1a2b1, C
L1a2b2, CL2a1b1, CL2a1b2, CL
2a2b1, CL2a2b2, ML1a1b1, ML1
a1b2, ML1a2b1, ML1a2b2, ML2a
1b1, ML2a1b2, ML2a2b1, ML2a2
b2, YL1a1b1, YL1a1b2, YL1a2b
1, YL1a2b2, YL2a1b1, YL2a1b
2, YL2a2b1, YL2a2b2, KL1a1b
1, KL1a1b2, KL1a2b1, KL1a2b
2, KL2a1b1, KL2a1b2, KL2a2b
1, KL2a2b2, L * = 57,0, a * = 5.3, b * = 3
The value of CMYK for 5.6 is obtained by the following equation: C = DL2 × Da2 × Db2 × CL1a1b1 + DL2
X Da2 x Db1 x CL1a1b2 + DL2 x Da1 x
Db2 x CL1a2b1 + DL2 x Da1 x Db1 x C
L1a2b2 + DL1 × Da2 × Db2 × CL2a1b
1 + DL1 × Da2 × Db1 × CL2a1b2 + DL1
X Da1 x Db2 x CL2a2b1 + DL1 x Da1 x
Db1 × CL2a2b2 M = DL2 × Da2 × Db2 × ML1a1b1 + DL2
× Da2 × Db1 × ML1a1b2 + DL2 × Da1 ×
Db2 x ML1a2b1 + DL2 x Da1 x Db1 x M
L1a2b2 + DL1 × Da2 × Db2 × ML2a1b
1 + DL1 × Da2 × Db1 × ML2a1b2 + DL1
XDa1 xDb2 xML2a2b1 + DL1 xDa1 x
Db1 × ML2a2b2 Y = DL2 × Da2 × Db2 × YL1a1b1 + DL2
XDa2 xDb1 xYL1 a1 b2 + DL2 xDa1 x
Db2 x YL1a2b1 + DL2 x Da1 x Db1 x Y
L1a2b2 + DL1 × Da2 × Db2 × YL2a1b
1 + DL1 × Da2 × Db1 × YL2a1b2 + DL1
XDa1 xDb2 xYL2a2b1 + DL1 xDa1 x
Db1 × YL2a2b2 K = DL2 × Da2 × Db2 × KL1a1b1 + DL2
× Da2 × Db1 × KL1a1b2 + DL2 × Da1 ×
Db2 x KL1a2b1 + DL2 x Da1 x Db1 x K
L1a2b2 + DL1 × Da2 × Db2 × KL2a1b
1 + DL1 × Da2 × Db1 × KL2a1b2 + DL1
XDa1 xDb2 xKL2a2b1 + DL1 xDa1 x
It becomes Db1 × KL2a2b2.

(Step S13) As described above, step S11 and step S12 are performed by C × M × Y × K: 2.
1 × 21 × 21 × 21 = 1944481 repeated input points and the result is CMYK four-dimensional input CMYK
A four-dimensional output LUT is obtained and used as a device link color profile (without smoothing).

The calibration color printer may output based on this device color profile (without smoothing), but in the present embodiment, LUT smoothing is further performed in order to prevent the occurrence of tone jumps and the like.

Here, steps S23a and S23 of FIG.
The contents and creation method of the smoothing method of the device color profile and the device link color profile shown in b and S26 will be described. The smoothing performed here is performed using the calculation results of the device color profile and the device link color profile obtained as described above. In addition, the smoothing of the present embodiment suppresses the occurrence of tone jump,
In order to prevent the color change from occurring, the smoothing is 3 points or more including the points before and after in the lightness direction (3 points in the embodiment).
Using.

First, the device link color profile CMYK; 21 × 21 × 21 × 21 → CMYK LUT
An example of the smoothing calculation method of is shown.

First, a case of K = 3 (0 to 20) will be described as an example. As one point on the input side, C2M3Y4 (0 to
The value on the output side for 20) is obtained. Since C1M2Y3 and C3M4Y5 are before and after the brightness direction on the input side, the output values are Cc2m3y4k3, Mc2m3y4k3, and Yc2m3, respectively.
y4k3, Kc2m3y4k3, Cc1m2y3k3, Mc1m2y3k3, Yc1m2
y3k3, Kc1m2y3k3, Cc3m4y5k3, Mc3m4y5k3, Yc3m4
y5k3 and Kc3m4y5k3.

Therefore, CMY to be obtained is C = (Cc2m3y4k3 + Cc1m2y3k3 + Cc
3m4y5k3) / 3, M = (Mc2m3y4k3 + Mc1m2y3k3 + Mc
3m4y5k3) / 3, Y = (Yc2m3y4k3 + Yc1m2y3k3 + Yc
3m4y5k3) / 3, K = (Kc2m3y4k3 + Kc1m2y3k3 + Kc
3m4y5k3) / 3.

C, M, Y: 21 × 21 × 21 = 9
261 points, the case of K = 3 ends, and the remaining K is also performed, and the smoothed device link color profile is obtained by replacing the LUT with the result obtained.

However, when any of C, M, and Y is an end point, naturally, there is no one of the front and rear points, and therefore the original value is used.

Next, a method of calculating the smoothing of the device color profile will be described. First, CMYK of device color profile: 9 × 9 × 9 × 9 → L * a *
The b * LUT will be described.

Considering the same, first, the case of K = 3 (0 to 8) will be described as an example. C2M as one point on the input side
The value on the output side for 3Y4 (0 to 8) is calculated. Before and after the brightness direction on the input side is C1M2Y3 and C3M4Y5, the output values are Lc2m3y4k3, ac2m3y4k3, and bc2m3, respectively.
y4k3, Lc1m2y3k3, ac1m2y3k3, bc1m2
y3k3, Lc3m4y5k3, ac3m4y5k3, bc3m4
It becomes y5k3.

Therefore, the obtained L * a * b * is L * = (Lc2m3y4k3 + Lc1m2y3k3 + L
c3m4y5k3) / 3, a * = (ac2m3y4k3 + ac1m2y3k3 + a
c3m4y5k3) / 3, b * = (bc2m3y4k3 + bc1m2y3k3 + b
c3m4y5k3) / 3.

This is performed for C, M, and Y: 9 × 9 × 9 = 729 points, and the case of K = 3 ends, and the remaining K
CMYK smoothed by replacing the LUT with the result obtained: 9 × 9 × 9 × 9 → L * a * b
* LUT is obtained.

Similarly, when any one of C, M, and Y is an end point, naturally one of the preceding and following points does not exist, so the original value is used.

Further, L * a * b *: 33 × 33 × 33
→ CMYK LUT will be described.

As one point on the input side, L2a3b4 (0-3
Find the value on the output side for 2). Before and after the brightness direction on the input side is L1a3b4 and L3a3b4, the output values are Cl2a3b4, Ml2a3b4, Yl2a3b4, and K, respectively.
12a3b4, Cl1a3b4, M1a3b4, Yl
1a3b4, Kl1a3b4, Cl3a3b4, Ml3
a3b4, Yl3a3b4, and Kl3a3b4.

Therefore, CMY to be obtained is C = (Cl2a3b4 + Cl1a3b4 + Cl3a3b
4) / 3, M = (Ml2a3b4 + Ml1a3b4 + Ml3a3b
4) / 3, Y = (Yl2a3b4 + Yl1a3b4 + Yl3a3b
4) / 3, K = (K12a3b4 + K11a3b4 + K13a3b)
4) / 3.

L * a * b *: 33 × 33 × 33 =
The smoothed L * a * b *: 33 × 33 × was performed for 35937 points and the LUT was obtained.
33 → CMYK LUT is obtained.

Similarly, when L is an end point, naturally,
The original value will be used, since either one of the preceding and following points does not exist.

In particular, regarding the L * a * b * → CMYK LUT, the tone jump may occur due to the process of moving a point outside the color reproduction range when obtaining the LUT, so smoothing is effective.

Further, in the above description, all LUTs are smoothed, but any one or two or more may be smoothed.

In the above description, the device link color profile is created and used, but it is also possible to use only two device color profiles without creating the device link color profile.
Smoothing to either one or both of the two device color profiles.

As described above, according to the present embodiment, since the device link color profile is smoothed, it is possible to obtain an output from a calibrating color printer with little color change and good color accuracy without tone jump. To be

Further, the basic color is C instead of the four colors CMYK.
The same applies to the case of three colors of MY or RGB.

Note that program software is created so that the computer executes the steps of the color adjusting method according to the present embodiment shown in FIGS. 1, 7, and 16, and the program software is read by the computer. It can be stored in any possible recording medium.

[0081]

As described above, according to the color adjusting method of the present invention, when the color is converted and output by the color printer for calibration, the color adjustment does not cause the tone jump due to the color conversion and the color change due to the smoothing. A method can be provided.

[Brief description of drawings]

FIG. 1 is a flowchart of a procedure of a color adjusting method of a printing machine and a proof color printer using a device link color profile according to the present embodiment.

FIG. 2 is an explanatory diagram of an LUT that converts CMYK color values into color system values L * a * b * in the present embodiment.

FIG. 3 is a diagram showing an example of a color patch image for measuring the color values of CMYK in the present embodiment.

FIG. 4 is a diagram showing a distribution of points to be interpolated with sample points on a locus according to CMY color values and color system values in the present embodiment.

FIG. 5 is a diagram showing the order of interpolation processing when converting a CMY color combination into a color system value in the present embodiment.

FIG. 6 shows color system values L * a * b * in the present embodiment.
FIG. 7 is an explanatory diagram of an LUT for converting CMYK color values.

FIG. 7 shows L * a * b * → CMYK in the present embodiment.
6 is a flowchart of a procedure for obtaining a three-dimensional input / four-dimensional output LUT of an LUT.

FIG. 8 is a coordinate diagram showing a target value T ′ in coordinates of C and M color systems in the present embodiment.

FIG. 9 is a coordinate diagram showing a target value T at coordinates of a combination of C and M colors in the present embodiment.

FIG. 10 is a coordinate diagram of a convergence calculation process for estimating a target value T at coordinates of a combination of C and M colors in the present embodiment.

FIG. 11 is a coordinate diagram of a convergence calculation process for estimating a target value T ′ in the coordinates of the C and M color systems in the present embodiment.

FIG. 12 is a diagram showing the target value T ′ in the coordinates of the color systems of C and M when the target value T ′ is outside the color reproduction range in the present embodiment.

FIG. 13 is a coordinate diagram showing the target value T ′ in the coordinates of the color systems of C and M when the target value T ′ is outside the color reproduction range in the present embodiment. It is a coordinate diagram which shows having moved to within the range.

FIG. 14 shows C and M when a target value T ′ outside the color reproduction range is moved into the color reproduction range in the present embodiment.
It is a figure which shows the target value T in the coordinate of the color combination of.

FIG. 15 is a CM of a printing press device according to the present embodiment.
The color value of YK is CMY of the calibration color printer device.
FIG. 9 is an explanatory diagram of an LUT for converting into a K color value.

FIG. 16 is a flowchart of a procedure for creating a device link color profile according to the present embodiment.

FIG. 17 is a diagram showing an example of the configuration of the device according to the embodiment of the present invention.

[Explanation of symbols]

10 PC 11 Arithmetic processing unit 12 First memory 13 Second memory 14 Interface 15 Display 16 Operation part 17 Internal bus 20 Color printer for calibration 30 bus

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2C262 AA24 AA29 AB12 BA09 BA16                       BC01 BC13 BC19 EA04                 5B021 AA01 LG07 LG08                 5B057 CA01 CA08 CB01 CB08 CE17                       CE18 CH07 CH08                 5C077 LL01 LL12 LL19 MP08 PP33                       PP36 PP37 PQ12 PQ22 PQ23                 5C079 HA18 HB03 HB08 HB11 HB12                       LB02 MA01 MA04 MA11 NA03                       NA29 PA03 PA07

Claims (9)

[Claims] 1. A first lookup in which a color system value is stored as an output value with respect to an input value of a combination of four or three basic colors for a first color image output device that is a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system First color profiles each including a second look-up table in which the values of the above are stored, and outputs that match the first color image output device are output to the second color profiles.
As described above, the two first color profiles or the first created based on the two first color profiles can be obtained.
Color conversion of image data by a color profile that stores a value of a combination of four or three basic colors as an output value for an input value of a combination of four or three basic colors for output in the color image output device of In the color adjusting method, the number of 4 in the first look-up table of the first color profile of the first color image output device is increased.
The value of the color system for a certain combination of colors or three basic colors is 3 or more including the points before and after the lightness direction of the certain combination of the four or three basic colors in the first lookup table. The color adjustment method is characterized by being created by averaging the values of the color system for. 2. A first look-up in which a color system value is stored as an output value with respect to an input value of a combination of four or three basic colors for a first color image output device as a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system First color profiles each including a second look-up table in which the values of the above are stored, and outputs that match the first color image output device are output to the second color profiles.
As described above, the two first color profiles or the first created based on the two first color profiles can be obtained.
Color conversion of image data by a color profile that stores a value of a combination of four or three basic colors as an output value for an input value of a combination of four or three basic colors for output in the color image output device of In the color adjusting method, the values of four or three basic colors for a certain combination of colorimetric system values in the second look-up table of the first color profile of the second color image output device. Is created by averaging the values of four or three basic colors for three or more points including points before and after the certain direction of the combination of the values of the color system in the second lookup table. Color adjustment method characterized by. 3. A first look-up in which a color system value is stored as an output value for an input value of a combination of four or three basic colors for a first color image output device as a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system Each of which creates a first color profile including a second look-up table in which the values of the two are stored, and based on the two first color profiles, outputs four colors for output in the first color image output device. 4 or 3 colors for output in the second color image output device as output values for input values of colors or combinations of three basic colors
A second color profile that stores the values of the basic colors of the colors is created, and the second color profile is output so that an output matching the color of the first color image output device can be obtained by the second color image output device. A color adjusting method for performing color conversion on image data according to a second color profile, wherein a combination of four or three basic colors for output in the first color image output device in the second color profile is used. The value of the four-color or three-color basic color for output in the second color image output device is the combination of the four-color or three-color basic color for output in the first color-image output device. Which is created by averaging the values of four or three basic colors for output in the second color image output device with respect to three or more points including points before and after the lightness direction Adjustment method 4. A first lookup in which a color system value is stored as an output value with respect to an input value of a combination of four or three basic colors for a first color image output device as a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system First color profiles each including a second look-up table in which the values of the above are stored, and outputs that match the first color image output device are output to the second color profiles.
As described above, the two first color profiles or the first created based on the two first color profiles can be obtained.
Color conversion of image data by a color profile that stores a value of a combination of four or three basic colors as an output value for an input value of a combination of four or three basic colors for output in the color image output device of In the color adjusting method, the number of 4 in the first look-up table of the first color profile of the first color image output device is increased.
The value of the color system for a certain combination of colors or three basic colors is 3 or more including the points before and after the lightness direction of the certain combination of the four or three basic colors in the first lookup table. Are created by averaging the color system values for the four color or 3 for a certain combination of the color system values in the second lookup table of the first color profile of the second color image output device. The value of the basic color of the color is an average of the values of the basic colors of four or three colors with respect to three or more points including points before and after the lightness direction of the certain combination of the values of the color system in the second lookup table. A color adjustment method characterized by being created by. 5. A first lookup in which a color system value is stored as an output value with respect to an input value of a combination of four or three basic colors for a first color image output device as a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system Each of which creates a first color profile including a second look-up table in which the values of the two are stored, and based on the two first color profiles, outputs four colors for output in the first color image output device. 4 or 3 colors for output in the second color image output device as output values for input values of colors or combinations of three basic colors
A second color profile that stores the values of the basic colors of the colors is created, and the second color profile is output so that an output matching the color of the first color image output device can be obtained by the second color image output device. In the color adjusting method for performing color conversion on image data according to the second color profile, 4 in the first lookup table of the first color profile of the first color image output device.
The value of the color system for a certain combination of colors or three basic colors is 3 or more including the points before and after the lightness direction of the certain combination of the four or three basic colors in the first lookup table. Is generated by averaging the values of the color system for the second color profile, and the second color profile for the second color profile for output by the first color image output device is combined with the second color profile. The values of the four or three basic colors for output in the color image output device are the values in the lightness direction of the certain combination of the four or three basic colors for output in the first color image output device. A color adjusting method, which is created by averaging the values of four or three basic colors for output in the second color image output device with respect to three or more points including front and back points. 6. A first lookup in which a color system value is stored as an output value with respect to an input value of a combination of four or three basic colors for a first color image output device as a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system Each of which creates a first color profile including a second look-up table in which the values of the two are stored, and based on the two first color profiles, outputs four colors for output in the first color image output device. 4 or 3 colors for output in the second color image output device as output values for input values of colors or combinations of three basic colors
A second color profile that stores the values of the basic colors is created, and the second color image output device is configured to obtain an output that matches the color of the first color image output device. In a color adjusting method for performing color conversion on image data with a second color profile, for a certain combination of color system values in the second lookup table of the first color profile of the second color image output device. The values of the four or three basic colors are the four or three basic colors for three or more points including points before and after the certain combination of the values of the color system in the second lookup table in the lightness direction. Of the four basic colors for output in the first color image output device in the second color profile. The values of the four or three basic colors for output in the second color image output device for the matching are the values of the four or three basic colors for output in the first color image output device. It is created by averaging the values of four or three basic colors for output in the second color image output device with respect to three or more points including points before and after the certain direction in the lightness direction. How to adjust the color. 7. A first lookup in which a color system value is stored as an output value with respect to an input value of a combination of four or three basic colors for a first color image output device as a color matching target. For the second color image output device that creates the first color profile including the table and reproduces the target color, four or three basic colors as the output value for the input value of the combination of the values of the color system Each of which creates a first color profile including a second look-up table in which the values of the two are stored, and based on the two first color profiles, outputs four colors for output in the first color image output device. 4 or 3 colors for output in the second color image output device as output values for input values of colors or combinations of three basic colors
A second color profile that stores the values of the basic colors of the colors is created, and the second color profile is output so that an output matching the color of the first color image output device can be obtained by the second color image output device. In the color adjusting method for performing color conversion on image data according to the second color profile, 4 in the first lookup table of the first color profile of the first color image output device.
The value of the color system for a certain combination of colors or three basic colors is 3 or more including the points before and after the lightness direction of the certain combination of the four or three basic colors in the first lookup table. Are created by averaging the color system values for the four color or 3 for a certain combination of the color system values in the second lookup table of the first color profile of the second color image output device. The value of the basic color of the color is an average of the values of the basic colors of four or three colors with respect to three or more points including points before and after the lightness direction of the certain combination of the values of the color system in the second lookup table. The second color for a certain combination of four or three basic colors for output in the first color image output device in the second color profile. The values of the four basic colors or the three basic colors for output in the image output device are before and after in the lightness direction of the certain combination of the four basic colors or three basic colors for output in the first color image output device. The color adjustment method is characterized by averaging the values of four or three basic colors for output in the second color image output device with respect to three or more points including the point. 8. A program for causing a computer to execute the color adjusting method according to claim 1. 9. A computer-readable storage medium that stores the program according to claim 8.