JP2000280531A - Color correction method for image outputting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color correction method for an image outputting apparatus capable of obtaining a good printing result by reducing the gloss difference in the image reproduction. SOLUTION: A color correction method for an image outputting apparatus for outputting an image with a plurality of color materials of different materials combined, comprises a first gloss degree obtaining step for obtaining the gloss degree of a single color output of each color material outputted alone, a second gloss degree obtaining step for obtaining the gloss degree of a mixed color output with two or more color materials combined and outputted, a first relationship obtaining step for finding the relationship between the amount of the color material used in the single color output and the gloss degree, a second relationship obtaining step for finding the relationship between the total amount of the color materials used in the mixed color output and the gloss degree, a third relationship obtaining step for finding the relationship between the mixture ratio of the color materials used in the mixed color output and the gloss degree, and a color material combination determining step for determining the combination of the color materials with respect to the gloss degree change based on the relationships obtained in the first to third relationship obtaining steps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color correction method for an image output device for correcting the influence of glossiness of a document in a color image output device.

[0002]

2. Description of the Related Art In recent years, an image output device that outputs a color image has been used. Hereinafter, a conventional image output device that outputs a color image will be described.

FIG. 1 is a configuration diagram showing an image output device.
In FIG. 1, 1 is a color display for displaying a color image, 2 is a computer for receiving a command and transmitting a data signal of a color image to be printed, and 3 is a color printer for receiving and printing a data signal of a color image. With the above configuration, a color image is printed.

FIG. 13 is a block diagram showing a conventional color correction processing apparatus for performing color correction processing of a color image data signal. The color correction processing apparatus shown in FIG.
Alternatively, it is built in the color printer 3. In FIG. 13, reference numerals 49, 50, and 51 denote density conversion circuits for converting RGB image data into density data Dr, Dg, and Db;
Reference numeral 52 denotes the RGB density data Dr, Dg, Db for cyan (C), magenta (M),
A color correction processing circuit that converts data into yellow (Y) and black (K) data, and 53 is a gradation modulation circuit that modulates gradation.

The color correction processing in the color correction processing apparatus shown in FIG. 13 is performed by a three-dimensional lookup table interpolation method.

FIG. 14 is an explanatory diagram of a color correction process performed by a three-dimensional lookup table interpolation method. In FIG. 14, reference numeral 54 denotes an RGB density space, which is a cube showing the range of the entire input color space from the computer 2. This input color space is divided into smaller cubes as shown. The CMYK data corresponding to the RGB density values at the vertices of each cube are stored as a reference table. Reference numeral 55 denotes an input RGB density signal of a color image. Reference numeral 56 denotes a divided cube in the RGB space 54, which is a cube including a coordinate point 55 of the input RGB density signal. Weights are obtained from the distances between the vertices of the cube and the input signal coordinate points 55, and output CMYK signals corresponding to the input RGB density signals are obtained from the CMYK lookup table values of the vertices of the cube. The obtained CMYK signals are printed by the color printer 3.

Hitherto, when printing black characters with a four-color printing printer, matte reproduction has been desired. Therefore,
The K toner is made of a material that can produce a duller reproduction than other C toner, M toner, and Y toner. Therefore, when black, that is, (R, G, B) = (0, 0, 0) is printed, the CMYK density is (C, M, Y, K) = (0, 0,
0, 255) (255 is the maximum density), and glossy characters were printed. However, when a natural image is printed, a difference in gloss between a portion of a single color of the K toner and a portion of a mixed color of the other C toner, M toner and Y toner appears, and an image having a good appearance cannot be obtained.

[0008]

As described above, in the conventional color correction method of the image output device, a difference in gloss appears when a natural image is reproduced from a difference in gloss as a result of printing with each toner. However, there is a problem that an image with good appearance cannot be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a color correction method for an image output apparatus which can obtain a good print result by reducing a difference in gloss in image reproduction.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a color correction method for an image output apparatus according to the present invention is a color correction method for an image output apparatus that outputs an image by combining a plurality of color materials having different materials. Wherein a first glossiness obtaining step for obtaining a single-color output single-color output glossiness of each color material, and a second glossiness for obtaining a mixed-color output glossiness output by combining two or more color materials. A degree obtaining step, a first relation obtaining step for obtaining a relationship between the amount of the color material used in the single color output and the gloss, and a second relation obtaining step for obtaining the relation between the total amount of the color material used in the mixed color output and the gloss. A second relationship obtaining step, a third relationship obtaining step for obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness, and a relationship obtained in the first to third relationship obtaining steps. Of color materials for glossiness change And a structure having a colorant combination determining step for determining the.

Thus, a color correction method for an image output device that can obtain a good print result by reducing the difference in gloss in image reproduction can be obtained.

[0012]

A color correction method for an image output device according to a first aspect of the present invention is a color correction method for an image output device for outputting an image by combining a plurality of color materials having different materials. A first glossiness obtaining step for obtaining a single-color output glossiness of a single color material output, and a second glossiness obtaining step for obtaining a mixed-color output glossiness output by combining two or more colorants. A first relation obtaining step for obtaining the relationship between the amount of the color material used in the single-color output and the gloss, and a second obtaining the relationship between the total amount of the color material used in the mixed-color output and the gloss.
A relationship obtaining step, a third relationship obtaining step for obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness, and a relationship obtained in the first to third relationship obtaining steps. And a color material combination determining step of determining a color material combination for the glossiness change.

With this configuration, color correction is performed in consideration of the gloss of the color material, and by taking into account the effect of the gloss of the color material, the difference in gloss on the reproduced image is reduced to provide a color with good appearance. This has the effect that an image output can be obtained.

According to a second aspect of the present invention, there is provided a color correction method for an image output apparatus for outputting an image by combining a plurality of color materials having different materials, wherein the color correction method comprises the steps of: A glossiness obtaining step for obtaining the glossiness of the single-color output output in one step; a glossiness prediction step for predicting the glossiness when two or more color materials are combined using the obtained glossiness of each color material; A first relationship obtaining step for obtaining a relationship between the amount of the color material used in the above and the glossiness; a second relationship obtaining step for obtaining a relationship between the total amount of the color material used in the mixed color output and the glossiness; A third relationship obtaining step for obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness, and a color material for the glossiness change based on the relationship obtained in the first to third relationship obtaining steps. Color combinations that determine the combination of colors In which it was decided to have a step.

With this configuration, it is possible to obtain the glossiness of a mixed color only by obtaining the glossiness of a single color toner.
This has the effect that the relationship between glossiness and toner can be easily obtained.

According to a third aspect of the present invention, there is provided a color correcting method for an image output apparatus, wherein the four primary colors of printing are cyan, magenta,
A color correction method for an image output device that outputs an image by combining yellow and black color materials, wherein a glossiness obtaining step for obtaining a single-color output glossiness of a single color material output;
A first predicting step of predicting a gloss when two or more color materials are combined using the obtained gloss of each color material, and a first step of obtaining a relationship between the amount of the color material used in the single color output and the gloss. A relation obtaining step, a second relation obtaining step for obtaining a relationship between the total amount of the color materials used in the mixed color output and the glossiness, and obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness A third relationship obtaining step, a color material combination determining step of determining a combination of color materials for a change in gloss based on the relationships obtained in the first to third relationship obtaining steps, and mixing of black from the determined combination. And a black mixing amount determining step of determining the amount.

This configuration has the effect that the glossiness can be corrected by adjusting only black.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG.

(Embodiment 1) FIG. 2 is a color patch diagram showing a color patch 4 for examining glossiness in Embodiment 1 of the present invention. In FIG. 2, the colors of the squares are different from each other, and the color patches 4 are respectively CMYK
Are determined and the total toner amount and the mixing ratio are determined and printed.
As the color patches in the present embodiment, since the gloss of the K toner is low, K to C, K to M, K
To Y, K to red (R), K to green (G), and K to blue (B).

FIG. 3 is a toner amount coordinate diagram showing each toner amount when changing from K to C. In FIG. 3, 5 is an axis indicating the amount of K toner, 6 is an axis indicating the amount of C toner,
The toner amount increases in the direction of the arrow. 7 is a coordinate point indicating the maximum value of the K toner amount, and 8 is a coordinate point indicating the maximum value of the C toner amount. Reference numeral 9 denotes an equal total toner amount line indicating a combination having the same total toner amount, and reference numeral 10 denotes a coordinate point indicating a combination of C and K to be printed on a color patch.

FIG. 4 is a toner amount three-dimensional coordinate diagram showing each toner amount when changing from K to B. In FIG. 4, reference numeral 11 denotes an axis indicating the amount of K toner, 12 denotes an axis indicating the amount of C toner, and 13 denotes an axis indicating the amount of M toner. The amount of toner increases in the direction of the arrow. 14 is a coordinate point indicating the maximum value of the K toner amount, 15 is a coordinate point indicating the maximum value of the C toner amount, and 16 is a coordinate point indicating the maximum value of the M toner amount. Reference numeral 17 denotes a coordinate point at which both the C toner amount and the M toner amount reach the maximum, that is, the B color is reproduced. Reference numeral 18 denotes a coordinate origin indicating that the total toner amount is 0, and reference numeral 19 denotes a line segment connecting the coordinate origin 18 and the coordinate point 17 of B.

FIG. 5 is a two-dimensional coordinate diagram of the toner amount on the K toner amount axis 11 and the line segment 19 shown in FIG. 4, and shows the respective toner amounts when changing from K to B. As in the case of FIG. 3, reference numeral 20 denotes an equal total toner amount line, and reference numeral 21 denotes a coordinate point of a combination of toners to be printed on a color patch.

The other changes from K to M, K to Y, K to red (R), and K to green (G) similarly determine the combination of each toner to be printed on a color patch.

The glossiness of the created color patch is measured (first relation acquisition step).

FIG. 6 is a schematic diagram showing the measurement principle of glossiness. In FIG. 6, reference numeral 22 denotes a light source, and light from the light source 22 is emitted toward the measurement surface. Reference numeral 23 denotes a measurement surface on which light is reflected. Reference numeral 24 denotes a light receiver for detecting the intensity of the reflected light. The glossiness is determined by the ratio of the intensity of the reflected light measured at the measurement portion to the intensity of the light reflected from the gloss reference plate according to this measurement principle (first glossiness acquisition step and second glossiness acquisition Steps).

FIG. 7 shows the glossiness and K toner measured on the third equal total toner amount line from the K axis among the seven equal total toner amount lines 20 shown in FIG. 5 in the case of a change from K to B. FIG. 6 is a relationship diagram showing a relationship with a mixing ratio. In FIG. 7, reference numeral 25 denotes an axis indicating the magnitude of the glossiness, and reference numeral 26 denotes an axis indicating the mixing ratio of the K toner amount to the total toner amount.
27 is a characteristic line indicating a change in the measured gloss. It can be seen that the glossiness decreases as the mixing ratio of the K toner increases.

FIG. 8 is a relationship diagram showing the relationship between the glossiness and the total toner amount measured when the mixing ratio of the K toner to the total toner amount is 1/2 in the case of the change from K to B. . In FIG. 8, reference numeral 28 denotes an axis indicating the magnitude of glossiness, and reference numeral 29 denotes an axis indicating the total toner amount. Reference numeral 30 denotes a coordinate point indicating the glossiness of the paper. A characteristic line 31 indicates a change in glossiness with respect to the total toner amount.

From the relationship between the glossiness and the mixing ratio of the K toner to the total toner amount and the relationship between the glossiness and the total toner amount shown in FIGS. 7 and 8, K to C, M, Y, K, R, G, The total toner amount and the mixing ratio of the K toner are determined so as to smooth the change in the glossiness to B (the second relation acquisition step and the third
Relationship acquisition step).

FIG. 9 is a toner amount coordinate diagram showing combinations of toners that can smoothly reproduce the change in glossiness from K to B. In FIG. 9, reference numeral 32 denotes a characteristic line indicating a combination of toners that can smoothly reproduce a change in glossiness from K to B. As described with reference to FIG. 5, reference numeral 11 denotes an axis indicating the amount of K toner, 14 denotes a coordinate point indicating the maximum value of the amount of K toner,
Is a coordinate point for reproducing the color of B when both the C toner amount and the M toner amount are maximum, 18 is a coordinate origin indicating that the total toner amount is 0, and 19 is a coordinate origin 18 and a coordinate point 1 of B.
It is a line segment connecting 7.

The lines indicating the combinations determined above are drawn from other K to C, K to M, K to Y, K to R, and K to G
Is determined, and the color reproduction range of the color printer 3 is determined for the determined combination of lines (color material combination determination step). From the combination of the color reproduction ranges, a reference table value used in the reference table interpolation method shown in FIG. 14 is obtained and used for the color correction processing.

As described above, in the present embodiment, the first glossiness obtaining step for obtaining the glossiness of the single-color output of each color material which is single output, and the mixed color output which is output by combining two or more color materials. A second glossiness obtaining step for obtaining a glossiness of
A first relationship obtaining step for obtaining a relationship between the amount of the color material used in the single color output and the glossiness, and a second relationship obtaining step for obtaining the relationship between the total amount of the color material used in the mixed color output and the glossiness And a third relationship obtaining step for obtaining a relationship between the mixing ratio of the coloring materials used in the mixed color output and the glossiness, and a glossiness change based on the relationship obtained in the first to third relationship obtaining steps. By providing a color material combination determination step for determining the color material combination, color correction can be performed in consideration of the gloss of the color material. It is possible to obtain a good-looking color image output by reducing the difference in gloss.

(Embodiment 2) In Embodiment 1 of the present invention, K to C, K to M, K to Y, K to R,
A color patch is created for K to G and K to B, and each glossiness is measured. In the second embodiment of the present invention,
The glossiness of each mixed color is predicted from the glossiness of each toner single color used when printing C, M, Y, and K.

Hereinafter, a color correction processing method according to the second embodiment of the present invention will be described.

The color printer 4 shown in FIG. 2 is printed by the color printer 3 for only a single color. The glossiness of the monochrome toner is measured by a glossmeter shown in FIG. 6 (glossiness acquisition step). From the measurement results, an expression (1) indicating the relationship between the toner amount and the glossiness is obtained.

Gc = gc (mc), Gm = gm (mm), Gy = gy (my), Gk = gk (mk) (1) where mc, mm, my , Mk indicate the respective toner amounts of C, M, Y, and K, and Gc, Gm, Gy, and Gk indicate the respective gloss levels of C, M, Y, and K.

Using equation (1), according to equation (2), C,
The overall gloss Ga is determined when the respective toner amounts of M, Y, and K are mc, mm, my, and mk (a gloss estimation step).

Ga = F (mc, mm, my, my) = G (Gc, Gm, Gy, Gk) (2) Using the obtained result (first to third) Relationship acquisition step),
As in the first embodiment of the present invention, a CMYK combination that makes the change in glossiness smooth is determined (color material combination determination step), and the color reproduction range of the color printer 3 is determined.

Based on this combination of color reproduction ranges, FIG.
The reference table value used in the reference table interpolation method shown by is obtained and used for color correction processing.

As described above, in the present embodiment, the glossiness obtaining step for obtaining the glossiness of the single-color output of each colorant which is output singly, and the two or more colorants are obtained by using the obtained glossiness of each colorant. A gloss prediction step for predicting the gloss when combined, a first relationship obtaining step for obtaining a relationship between the amount of the color material used in the single color output and the gloss, and a color relationship of the color material used in the mixed color output. A second relationship obtaining step for obtaining a relationship between the total amount and the glossiness, a third relationship obtaining step for obtaining a relationship between the mixing ratio of the coloring materials used in the mixed color output and the glossiness,
~ Based on the relationship determined in the third relationship acquisition step,
By providing a color material combination determining step of determining a combination of color materials with respect to a change in gloss, it is possible to obtain a gloss of a mixed color simply by obtaining the gloss of a single color toner. And the toner can be obtained.

(Embodiment 3) Embodiment 3 of the present invention
Is a four-color printer based on the relationship between the total amount of toner determined in the first and second embodiments of the present invention and the relationship between the mixing ratio of each of the C, M, Y, and K toners and the glossiness. The color correction is performed by determining the under color removal ratio used in step (1). That is, the steps from the glossiness obtaining step to the color material combination determining step are the same as in the second embodiment.

FIG. 10 is a block diagram showing a color correction processing device according to the third embodiment of the present invention. In FIG. 10, reference numerals 33, 34, and 35 denote density conversion circuits for converting the R, G, and B signals into RGB density signals Dr, Dg, and Db. 3
Reference numeral 6 denotes a color correction processing circuit that performs printer color correction processing.
A process for converting into C, M, and Y densities is performed. An under color removal circuit 37 generates a K signal to obtain CMYK densities.
Reference numeral 38 denotes a gradation modulation circuit that performs gradation modulation.

FIG. 11 is a conceptual diagram showing the concept of the under color removal processing. In FIG. 11, 39 is a density axis, 40 is a density of C, 41 is a density of M, 42 is a density of Y, and 43 is a density of K. M, which is the lowest concentration among the concentrations of C, M, and Y
The CMY density which is about the same as several% (UCR rate) of density 41 is K
The density is replaced with a K density (black mixing amount determination step). The hatched portion 44 indicates the CMYK density after removing the undercolor. The white portion 45 is an undercolor removal portion. UC
In the present embodiment, a combination of C, M, Y, and K obtained in Embodiments 1 and 2 is used as a method for determining the R rate.

FIG. 12 is a relationship diagram showing the relationship between the UCR rate and the minimum density. 46 is the axis of the UCR rate, 4
7 is the axis of the lowest concentration. 48 is the UC for the lowest concentration
It is a characteristic line showing the R ratio. By using the UCR ratio of the characteristic line 48, the change in glossiness becomes smooth, and a color image with good appearance can be obtained.

As described above, in the present embodiment, a glossiness obtaining step for obtaining the glossiness of a single color output that is a single color material, and two or more colorants are obtained by using the obtained glossiness of each colorant. A prediction step of predicting the gloss when combined, a first relation obtaining step for obtaining a relationship between the amount of the color material used in the single-color output and the gloss, and a total amount of the color material used in the mixed-color output. A second relationship obtaining step for obtaining a relationship with the glossiness, a third relationship obtaining step for obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness, and first to third relationship obtaining By providing a color material combination determining step of determining a combination of color materials for a change in gloss based on the relationship obtained in the step and a black mixing amount determining step of determining a black mixing amount from the determined combination, Allowing correction of gloss by adjusting only.

[0045]

As described above, according to the color correction method for an image output device according to the first aspect of the present invention, a color correction method for an image output device that outputs an image by combining a plurality of color materials having different materials is provided. Wherein a first glossiness obtaining step for obtaining a single-color output single-color output glossiness of each color material, and a second glossiness for obtaining a mixed-color output glossiness output by combining two or more color materials. A degree obtaining step, a first relation obtaining step for obtaining a relationship between the amount of the color material used in the single color output and the gloss, and a second relation obtaining step for obtaining the relation between the total amount of the color material used in the mixed color output and the gloss. A second relationship obtaining step, a third relationship obtaining step for obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness, and a relationship obtained in the first to third relationship obtaining steps. Material that determines the combination of color materials for glossiness change Since the color correction can be performed in consideration of the gloss of the color material by having the registration determination step, the effect of the gloss of the color material is taken in, and the difference in gloss on the reproduced image is reduced. The advantageous effect that a good color image output can be obtained is obtained.

According to the color correction method for an image output device of the present invention, a color correction method for an image output device for outputting an image by combining a plurality of color materials having different materials, wherein each color material A gloss acquisition step of obtaining a single-color output single-color output gloss, and a gloss prediction step of predicting a gloss when two or more color materials are combined using the obtained gloss of each color material; A first relationship obtaining step for obtaining a relationship between the amount of the color material used in the single color output and the glossiness, and a second relationship obtaining step for obtaining the relationship between the total amount of the color material used in the mixed color output and the glossiness And a third relation obtaining step for obtaining a relation between the mixing ratio of the color materials used in the mixed color output and the gloss, and a relation for the gloss change based on the relation obtained in the first to third relation obtaining steps. Color material combinations that determine color material combinations With the determination step, it is possible to obtain the glossiness of the mixed color only by obtaining the glossiness of the single color toner, so that the advantageous effect that the relationship between the glossiness and the toner can be easily obtained can be obtained. Is obtained.

According to the color correcting method of the image output device according to the third aspect of the present invention, the color of the image output device that outputs the image by combining the four primary colors of printing, cyan, magenta, yellow, and black, is provided. A correction method, wherein a glossiness obtaining step for obtaining a glossiness of a single color output that is a single color material and a glossiness obtained when two or more colorants are combined using the obtained glossiness of each colorant. A prediction step for predicting, a first relation obtaining step for obtaining a relationship between the amount of the color material used in the single color output and the gloss, and a relation between the total amount of the color material used in the mixed color output and the gloss. The second relation obtaining step, the third relation obtaining step for obtaining the relation between the mixing ratio of the color materials used in the mixed color output and the glossiness, and the relation obtained in the first to third relation obtaining steps Based on the change in gloss The advantageous effect that the glossiness can be corrected by adjusting only black by having the color material combination determining step of determining the combination and the black mixing amount determining step of determining the black mixing amount from the determined combination. Is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an image output device.

FIG. 2 is a color patch diagram showing color patches for checking glossiness in the first embodiment of the present invention.

FIG. 3 is a toner amount coordinate diagram showing each toner amount when changing from K to C;

FIG. 4 is a toner amount three-dimensional coordinate diagram showing each toner amount when changing from K to B;

5 is a two-dimensional coordinate diagram of the toner amount with the K toner amount axis and the line segment shown in FIG. 4 as axes.

FIG. 6 is a schematic diagram showing the measurement principle of glossiness.

FIG. 7 is a relationship diagram showing the relationship between the glossiness measured on the equal total toner amount line of the total toner amount and the mixing ratio of K toner in the case of a change from K to B;

FIG. 8 is a relationship diagram showing the relationship between the glossiness and the total toner amount measured when the mixing ratio of the K toner to the total toner amount is 1/2 in the case of a change from K to B;

FIG. 9 is a toner amount coordinate diagram showing a combination of toners that can smoothly reproduce a change in glossiness from K to B.

FIG. 10 is a block diagram illustrating a color correction processing device according to a third embodiment of the present invention.

FIG. 11 is a conceptual diagram illustrating the concept of undercolor removal processing.

FIG. 12 is a relationship diagram showing a relationship between a UCR rate and a minimum density.

FIG. 13 is a block diagram showing a conventional color correction processing device for performing color correction processing of a color image data signal.

FIG. 14 is an explanatory diagram of a color correction process performed by a three-dimensional lookup table interpolation method.

[Explanation of symbols]

1 Color Display 2 Computer 3 Color Printer 4 Color Patch 5, 6, 11, 12, 13, 25, 26, 28, 29
Axis 7, 8, 10, 14, 15, 16, 17, 21, 30
Coordinate points 9, 20 Iso-total toner amount line 18 Coordinate origin 19 Line segment 22 Light source 23 Measurement surface 24 Light receiver 27, 31, 32 Characteristic line 33, 34, 35 Density conversion circuit 36 Color correction processing circuit 37 Under color removal circuit 38 Gradation modulation circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 2C262 AA24 AB11 BB03 BC01 BC15 EA11 FA13 5B057 AA11 CA01 CB01 CC02 CE11 CE17 DA01 DA13 DB06 5C074 AA08 BB17 CC26 DD01 DD24 DD27 DD28 EE08 FF15 GG13 5C077 LL19 MP02 PP32 PP32 PP32 5C079 HB03 HB04 KA17 LA21 LA33 LB01 NA03 PA03

Claims (3)

[Claims] 1. A color correction method for an image output apparatus for outputting an image by combining a plurality of color materials having different materials, wherein a first gloss is obtained for obtaining a single-output glossiness of a single color output of each color material. Degree obtaining step, a second gloss level obtaining step of obtaining a gloss level of a mixed color output obtained by combining the color materials with two or more color layers, and a relationship between the amount of the color material used in the single color output and the gloss level A first relation obtaining step for obtaining the relation between the total amount of the color materials used in the mixed color output and the glossiness, and a mixing ratio of the color materials used for the mixed color output. A third relationship obtaining step for obtaining a relationship with the glossiness, and a color material combination determining step for determining a combination of coloring materials with respect to the glossiness change based on the relationship obtained in the first to third relationship obtaining steps. Characterized by having The color correction method of the image output device. 2. A color correction method for an image output device for outputting an image by combining a plurality of color materials of different materials, wherein a glossiness obtaining step for obtaining a glossiness of a single color output of each of the color materials. A gloss prediction step of predicting the gloss when two or more color materials are combined using the obtained gloss of each color material; and calculating the gloss and the amount of the color material used in the single-color output. A first relation obtaining step for obtaining a relation;
A second relation obtaining step for obtaining a relationship between the total amount of the color materials used in the mixed color output and the glossiness; and a third obtaining a relationship between the mixing ratio of the color materials used in the mixed color output and the glossiness.
And a color material combination determining step of determining a combination of color materials for a change in gloss based on the relationships obtained in the first to third relationship obtaining steps. Color correction method. 3. A color correction method for an image output apparatus for outputting an image by combining color materials of cyan, magenta, yellow, and black, which are four primary colors of printing, comprising: A gloss acquisition step of obtaining a gloss, a prediction step of predicting a gloss when two or more color materials are combined using the obtained gloss of each color material, and a color material used in the monochrome output. A first relationship obtaining step for obtaining a relationship between the amount and the glossiness; a second relationship obtaining step for obtaining a relationship between the total amount of the color materials used in the mixed color output and the glossiness; A third relationship obtaining step for obtaining the relationship between the mixing ratio of the coloring materials and the glossiness, and a combination of the coloring materials with respect to the glossiness change based on the relationship obtained in the first to third relationship obtaining steps. Color material combination decision Step a color correction method for an image output apparatus characterized by having a black mixed amount determining step for determining the mixing amount of the black from the determined combination.