JP2001232860A - Apparatus and method for determining hue of special color for recording apparatus and recording medium - Google Patents

Abstract

(57) [Summary] To determine the hue of a special color for a printing apparatus capable of reducing the application of a printing agent to a printing medium, realizing high image quality and low running cost, and obtaining a high chroma image. It is an object to provide an apparatus, a method thereof, and a recording medium. SOLUTION: In the case of forming an image with multiple colors by adding a special color different from the basic color to the basic colors of cyan, magenta and yellow, a first recording color group of a predetermined color material is formed. One color material is selected from among them, and one color material in a second recording color group composed of color materials other than the color material constituting the first recording color group, and Are selected from the first recording color group so that when a color material selected from among the recording color groups of the above is superimposed, the color becomes a unique gray in a recording apparatus to which a predetermined recording method is applied. This determines the color of the colored material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image recording apparatus and method, and more particularly, to a special color hue determining apparatus for a recording apparatus for forming an image by adding a special color other than the subtractive three primary colors. The present invention relates to a method and a recording medium.

[0002]

2. Description of the Related Art Conventionally, in an image output apparatus such as a color printer, the colors of a recording material (color toner, color ink, etc.) for forming an image are cyan (C) and magenta (M), which are three subtractive primary colors. , Yellow (Y), or four colors obtained by adding black (K) thereto.

In this case, the image output device converts an input signal (R, G, B) into three colors of C, M, and Y or four colors to which K is added, and outputs an image using a recording material of each color. Perform formation.

However, in recent years, with the spread of color printers, demand for higher image quality has been increased. In particular, on plain paper, the color of the ink is poor due to the characteristics of the paper,
The problem is that the density and saturation are low. With the conventional four colors of CMYK, the colors that can be reproduced are limited due to the coloring properties of the coloring agent such as the dye of the recording agent, and it is difficult to reproduce more vivid colors.

By the way, in an ink jet recording apparatus using an ink mainly composed of water as a recording agent for forming an image, if the amount of ink applied per unit area increases, blurring of a boundary of a different color or recording paper may become watery. There is a drawback that a wavy (cockling) phenomenon occurs due to sucking, which leads to a decrease in image quality.

Further, since a large amount of ink is used, there is a disadvantage that running costs are increased.

[0007]

In order to overcome the above drawbacks, conventionally, in addition to CMYK, features such as red (R), orange (O), green (G), blue (B), violet (V), etc. Are disclosed.

For example, by mixing a cyan recording agent and a yellow recording agent, a conventionally expressed green can be expressed by using only a green recording agent as a special color. The amount of recording agent added to the medium is reduced. Therefore, it is possible to prevent the blurring of the different color boundary and the deterioration of the image quality due to the waving of the recording medium, thereby saving ink and toner. Further, by using a special color ink having a higher saturation than the color obtained by mixing the basic colors, a more vivid image can be obtained.

Japanese Patent Application Laid-Open No. 06-237351 discloses that color data of a pixel constituting a color image is compared with reference color data reproducible by four basic color materials of YMCK, and the color of each pixel is determined. It is determined whether or not reproduction is possible with the basic four color materials. If the reproduction is not possible with the basic four color materials, using the basic four color materials and a predetermined special color other than the basic four colors, A method for printing the pixel is disclosed.

Japanese Patent Application Laid-Open No. 11-069176 discloses that after converting an image signal RGB into C'M'Y ', the image signal RGB is divided into six primary colors C, M, Y, R, G, and B, and the above-mentioned six colors are converted. A method for printing with a color material is disclosed.

In any case, the purpose is to expand the color reproduction range and to reproduce colors accurately.

However, the above publication has a problem in that there is no specific disclosure regarding the hue of the special color recording agent used.

According to the present invention, in addition to the basic colors CMY, at least one special color having a hue approaching an achromatic color specific to a predetermined printing system when superimposed on the basic colors at a fixed ratio is provided. Therefore, the application of the recording agent to the recording medium is reduced, high image quality and low running cost are realized, and further, a special color hue determination apparatus for a recording apparatus capable of obtaining a high chroma image, its method and recording medium The purpose is to provide.

[0014]

According to the present invention, there is provided a color image recording method for forming an image in multiple colors by adding a special color different from the above basic colors to the basic colors of cyan, magenta and yellow. One color material is selected from the first recording color group composed of color materials, and the second recording color composed of color materials other than the color material constituting the first recording color group is selected. When one color material in the group is superimposed on a color material selected from the first recording color group, the color becomes a unique gray in a printing apparatus to which a predetermined printing method is applied. Thus, the color of the color material selected from the first recording color group is determined.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a diagram showing a recording apparatus 10 according to one embodiment of the present invention and an image processing system including the recording apparatus 10.

In the above embodiment, red (R), green (G), and blue (B) are used as special colors in addition to the basic colors, and the hues of the special colors R, G, and B are determined. Will be described below.

In the image processing system, the host computer 20 includes a CPU 21, a memory 22, an external storage 23, an input unit 24, and an interface 25 with a printer. The CPU 21 executes a program stored in the memory 22 to realize a procedure of color processing and quantization processing, which will be described later.

This program is stored in the external storage 23 or supplied from an external device. The host computer 20 communicates with the recording device 10 via the interface 25.
Connected to the recording device 10
To make a print record.

FIG. 2 is a block diagram for explaining the image processing operation in the above embodiment.

The input R, G, B color 8 bits (25 bits)
6 is a flowchart illustrating a processing operation for outputting image data (6 gradations) as 1-bit data for each of C, M, Y, K, R, G, and B colors.

First, the 8-bit data of each color of R, G, and B is converted into 8-bit data of each color of C, M, Y, K, R, G, and B by a three-dimensional lookup table (LUT) in a color conversion processing unit 31. Is converted to This process is a color conversion process, in which an input system RGB color is converted to an output system CM.
This is a process of converting to YKRRGB color. The input data consists of three primary colors (RG
B), but the above printer uses CMYKR
Since the GB color material is used, the above conversion processing is performed.

The three-dimensional LUT used for color processing holds data discretely, and interpolation is performed between the held data. Since the interpolation processing is a known technique, The detailed description of is omitted.

C, M, Y, K, R,
The output gamma correction unit 32 subjects the 8-bit data of each of the G and B colors to output gamma correction using a one-dimensional LUT.
Since the relationship between the number of print dots per unit area and output characteristics (reflection density, etc.) does not often have a linear relationship, by performing output γ correction, C, M, Y, K,
A linear relationship between the input levels of R, G, and B bits and the output characteristics at that time is guaranteed.

The above is an explanation of the operation of the color processing unit in the above embodiment. The input R, G, B color 8-bit data is stored in the color materials C, M, Y, K, R, G, B of the output device. Each color is converted into 8-bit data.

The color recording apparatus 10 in the above embodiment
Is a binary recording device, so the above C, M, Y, K,
The 8-bit data of each color of R, G, and B is quantized by the next quantization processing unit 33 into 1-bit data of each color of C, M, Y, K, R, G, and B. As a quantization method, a conventionally known error diffusion method or dither method is used.

Next, a method of determining the hue of the special color ink used in the above embodiment will be described.

As an example, a method of determining the hue of the green (G) recording agent will be described. Hereinafter, the recording agent will be described as ink. In addition, colors will be described in a display system of a uniform color space of CIE1976L ^* a ^* b ^* .

Input data (R, G, B) = (0, 25)
From the green of (5, 0), input data (R, G, B) =
Consider a line leading to black at (0,0,0). The line corresponds to one edge of a color solid having vertices of cyan, magenta, yellow, red, green, blue, white, and black. The conversion from the input RGB data to the ink data is performed by the color processing unit 31.

First, input data (R, G, B) = (0,
The green of 255, 0) is expressed by green ink.

There are usually two ways to produce darker, near black colors. That is, there are (1) a method of mixing complementary color inks, and (2) a method of mixing black ink. In the case of these greens, the complementary color is magenta. In contrast to the complementary color ink dots, the black ink dots have a very high dot density, and particularly when mixed in a high-brightness color such as green, the so-called “granularity” deteriorates. Therefore, it is preferable to use a complementary color ink dot as much as possible to bring the color closer to black.

FIG. 3 is an explanatory diagram of the above embodiment.

FIG. 3A shows a magenta ink and two types of green inks G1 and G2 having different hues from each other.
As shown in FIG. 3 (2), the color when the printing rate is gradually increased is represented on the basis of the a ^* b ^* axes, and the hue of each ink is shown.

In FIG. 3B, the vertical axis represents the driving d.
uty. The ejection duty is a percentage of the actual number of ink ejections with respect to the number of pixels that can be ejected. That is, the case where ink is printed on all the pixels one by one is defined as “100% duty”. The points printed at 100% duty for each color are referred to as PtG1, PtG
2, PtM. The point where the hue of each ink intersects is a state in which no ink is printed, that is, white of paper. This point is referred to as a point PtW. PtW
However, a ^* = b ^* = 0 is not satisfied, and the reason for this is that the white of the paper on which nothing is printed deviates from the absolute white.

FIG. 4 is an explanatory diagram of the above embodiment.

FIG. 4A shows that each of the two types of greens G1 and G2 shown in FIG.
As in FIG. 3A, the color when printing is performed in the duty mode and the printing is performed while changing the amount of magenta is shown based on the a ^* b ^* axis.

FIG. 4 (2) is a diagram showing the amount of each color ink applied.

FIG. 4A shows input data (R, G, B).
= (0, 255, 0) green (points PtG1, PtG in the figure)
tG2), input data (R, G, B) = (0, 0,
This is the same as the change in color when approaching black in 0) described above for each of the green inks G1 and G2.

By the way, the absolute “black” or “gray” indicates a color in which a ^* = b ^* = 0 and only the lightness L differs. However, in an actual recording apparatus, “gray” is not necessarily a ^* = b ^* = 0 depending on the ink or paper used.
Often not.

FIG. 5 shows the recording apparatus 10 in the above embodiment.
FIG. 6 is a diagram showing the color of the gray line obtained by the a ^* b ^* axis.

Here, the "gray line" is a color in which the input data (R, G, B) is R = G = B = 0 to 255. Usually, “white” where R = G = B = 255 is white of paper. For other colors, the (R, G, B) data is replaced with (C, M, B) by a conventionally known method in accordance with a look-up table preset for the recording apparatus 10.
(Y, K) data and printed with a combination of C, M, Y, and K inks.

The point PtW shown in FIG. 5 is a white point and is determined by the color of the recording paper. Point PtK
Is a black point, which is determined by the color of the black ink in the above embodiment. An intermediate gray color is distributed on a line connecting the points PtW and PtK.

FIG. 6 is a diagram showing an example of CMYK output signals corresponding to input data R = G = B = 0 to 255 determined by a conventional method.

In FIG. 6, the horizontal axis is the input data of (R, G, B), and (R, G, B) = (255, 25)
5, 255) from (R, G, B) = (0,
(0, 0) up to black. In FIG.
The vertical axis is the signal value of each of CMYK.

In the above embodiment, where the density is close to white and the density is low, black is expressed by CMY color mixture to reduce the graininess, the density is increased with Bk ink dots from the middle, and finally, only the black ink is used. Expresses high density black. With such a gray line, the black point PtK shown in FIG. 5 is determined by the color of the black ink. That is, since PtK is (R, G, B) = (0, 0, 0), black is 255 from FIG. That is, printing is performed with a black ink of 100% duty. Therefore, Pt
K depends on the color of the black ink.

Of course, the method of expressing gray is not limited to this example. It may be expressed only by the color mixture of CMY, and black ink may be used from a place close to white. In any case, an optimum method may be adopted depending on the configuration of the apparatus, ink and paper.

FIG. 7 shows how the color changes when the magenta ink is added to the two types of green inks G1 and G2 shown in FIG. 4A, and the color of the gray line of the recording apparatus shown in FIG. It is the figure which represented the state of change simultaneously.

As can be seen from FIG. 7, the color obtained using the green G1 approaches the black (PtK) of the recording device, while the color obtained using the green G2 is the black (PtK) of the recording device. Keep away from.

Therefore, if green G2 is adopted as a special color in addition to the basic color, it is necessary to perform toning with a gradation from green to black. The trajectory of the color in this case is indicated by a dotted line in FIG. If black dots are used for toning, there is a possibility that the granularity may deteriorate,
In addition, when other colors are used, complicated procedures are required, such as a need to finely set the mixing ratio.

On the other hand, as a special color, green G1
Is adopted, the color approaches black (PtK) unique to the printing apparatus only by adding the complementary color magenta, so that there is no need for toning or the like. Therefore, the above-mentioned problems such as graininess are eliminated, and this is effective.

Therefore, the green ink G1 may be used as the green ink to be added to the basic color.

In the above embodiment, the points PtG1 and PtG1
(A ^* , b ^* ) at each point of G2 and PtM is PtG1: (a ^* , b ^* ) = (− 63, 23), PtG
2: (a ^* , b ^* ) = (− 65, 13), PtM:
(A ^* , b ^* ) = (73, -3).

In the above-described embodiment, the hue of the green ink has been described. For the blue and red, similarly to the case of the green ink, when complementary colors are added, blue and red having a hue approaching black of the printing apparatus are selected. .

As described above, when RGB is used as a color to be added to the basic colors of CMY, when mixed with the respective complementary colors, the RGB is adjusted so as to approach black inherent to the recording apparatus.
When the hue of the ink is determined, it is possible to obtain a smooth gradation without granularity.

[Second Embodiment] In the first embodiment, when the colors of G and M, the colors of R and C, and the colors of B and Y are mixed, the hue of RGB is changed so as to be the same color as black unique to the recording apparatus. This is an example of determining

However, in the above combination, the colors represented by a ^* and b ^* can be made the same as the black color of the printing apparatus, but the density is often not as high as that of black ink. In this case, it is preferable that the target point in the case of mixed colors is not a black (PtK) but an intermediate gradation of a gray line having a lower density.

In the second embodiment, a recording apparatus having the same gray lines as in the first embodiment is taken as an example. That is, also in the second embodiment, the color measured by the gray line is as shown in FIG.

FIG. 8 is an explanatory diagram of the above embodiment.

FIG. 8A shows 100% du of green G3 and green G4 which are green inks having different hues.
FIG. 9 is a diagram illustrating a change in color when magenta is superimposed on ty printing.

FIG. 8 (2) is a diagram showing the amount of shot of each color at this time.

In FIG. 8 (1), as in the first embodiment, the point PtW is a white point, which represents the white of the paper.
The point PtK is a black point and represents the color of the black ink of the printing apparatus in the second embodiment.
The curve connecting tK is the gray line.

As shown in FIG. 8A, in the green G4, when mixed with magenta at a certain ratio, the point a ^* b ^* is the same as the point PtK, but the mixed line of the green G3 and magenta is It intersects between the points PtW and PtK, that is, one point PtGr of gray halftone. Here, when magenta is superimposed on green G3 and green G4 shown in FIG. 8, the density at the point where the gray line intersects is lower than the black point.

Next, a description will be given of a case where the green G3 is more preferable than the green G4 as the recording system.

FIG. 9 shows the recording apparatus 10 in the above embodiment.
FIG. 4 is a diagram for explaining a relationship between lightness and saturation of a gray line of FIG.

Lightness is almost proportional to density. In FIG. 9, the vertical axis is lightness L and the horizontal axis is saturation. The saturation is
√ (a ^* ＾ 2 + b ^* ＾ 2). In FIG. 9, for convenience, the white point PtW and the black point Pt
K and K are aligned so that the saturation becomes zero.

As can be seen from FIG. 5, the gray line is
Since saturation is different at each point, as shown in FIG. 9, even if white and black are set to zero saturation,
The saturation does not become zero in the middle gray.

FIG. 10 is a diagram showing a case where the relationship between lightness and saturation when the greens G3 and G4 shown in FIG. 8A and magenta are superimposed is further added to FIG. .

Assume that the 100% duty points PtG3 and PtG4 of the greens G3 and G4 have the same saturation.

The solid line shows the relationship between lightness L and chroma when magenta is added to green G4. As magenta is added, both lightness and saturation decrease. Then, as shown in FIG.
It becomes the same saturation as.

However, at this time, the black obtained by mixing G4 and M has a lower density than the black ink, so that the brightness is higher than PtK. At the point where the brightness is high, the saturation becomes the same as PtK. Therefore, in order to further increase the density and obtain the desired black PtK, black dots are further added.

For this reason, after the saturation becomes the same as PtK, as shown by the solid line, it approaches PtK straight. As a result, the relationship between the lightness from the point PtG4 of 100% duty of the green G4 to the black PtK and the saturation shows a bent locus as shown in FIG. 10, and a smooth gradation is obtained in the actual image. Can not be.

On the other hand, the relationship between lightness L and saturation when magenta is added to green G3 is shown by a broken line. Similarly, when magenta is added, lightness and saturation decrease. In the case of green G3, as shown in FIG. 8 (1), since it intersects at a point PtGr in the middle of the gray line, as shown in FIG. 10, both the lightness and the saturation are PtGr.
It is larger than K. From the point PtGr, the desired black Pt
In order to go to K, it is only necessary to mix black ink. As a result, the point Pt of 100% duty of green G3
The relationship between lightness and saturation from G3 to black PtK is shown in FIG.
A relatively smooth trajectory is drawn as shown by 0, and a smooth gradation can be obtained even in an actual image.

Therefore, the green ink G3 is preferably used as the green ink to be added to the basic color.

In the above embodiment, the hue of the green ink has been described. However, similarly to the case of the green ink, when the complementary colors are added to the blue and red,
Blue and red hues approaching one point of the gray line of the recording device are selected. One point on the target gray line is selected so that when two colors of the special color and the basic color corresponding thereto are set to the same a ^* b ^* as the gray line, the brightness is almost the same.

According to the above-described embodiment, when RGB is used as a color to be added to the basic colors of CMY, the hue of the RGB ink is determined so that when mixed with the respective complementary colors, the hue of the RGB ink approaches the gray unique to the printing apparatus. A smooth gradation without graininess can be obtained.

[Third Embodiment] In the first embodiment and the second embodiment, when the CMY inks are determined, the RGB values are set.
This is an example of determining the hue of the ink. However, when there is a good dye in the RGB ink and the RGB ink is determined first, the CMY ink may be determined from the RGB ink. In this case as well, the hue of the CMY inks is determined so as to approach the target achromatic color when the overprinting is performed, as described above.

That is, according to the above embodiment, there is a first recording color group (for example, RGB) and a second recording color group (for example, CMY), and one color is selected from the first recording color group. Then, when one of the second recording color groups is superimposed on the selected color material, the second recording color group is selected from the second recording color group so that the predetermined achromatic color unique to the recording apparatus is obtained. Since the color of the applied color material is determined, the image quality is improved by reducing the granularity, and the use amount of the recording agent can be reduced, so that the image quality deterioration such as bleeding is reduced and the running cost is reduced.

Next, the operation of the above embodiment will be described.

FIG. 11 is a flowchart showing the operation of the above embodiment.

First, red, green, and blue are considered as the first recording color group, and cyan, magenta, and yellow are considered as the second recording color group. Then, a special color used in the printer is selected (S1). That is, how many colors are added to the printer, for example, red and green are selected as special colors. In this case, the number of special colors to be used is N.

Then, K = 1 (S2), the hue of the K-th special color is determined (S3), and step S3 is repeated until K becomes N (S3, S4, S5), and K becomes N Is reached (S4), the process ends.

FIG. 12 is a flowchart specifically showing the step (S3) of determining the hue of the K-th special color in FIG.

First, assume that the K-th color is Color1K, and a complementary color to the K-th color Color1K is
Color2 (S41). Here, it is assumed that the K-th color Color1K is green. In this case, C
color1K = G, Color2 = M.

Then, an initial value of the hue of the green ink is given (S42). This means that the a-axis is plus 0 ° and “+” is counterclockwise. Then, Color1K (in this case, green) and Color2 (in this case, magenta)
Then, it is determined whether the target gray is obtained as a result of adding (S43). In the first embodiment, it is determined whether or not the black point PtK approaches the middle point PtGr in the second embodiment.

If the mixture of Color1K and Color2 does not become the same color as the target point (PtK) (S4
3) The green hue is shifted by Δ degrees (S45), the same operation as above (S43) is performed, and the process is repeated until the determination in step 14 becomes “YES”.

As a result of mixing the two colors, the target point (Pt
If the color becomes the same as K) (S43), Colo at that time
The hue of r1 is the desired hue α degree, and the hue is determined (S44).

A recording medium storing the program code of software for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (CPU or MPU) of the system or the apparatus stores the program stored in the recording medium. The object of the present invention is also achieved by reading and executing the code.

In this case, the program code itself read from the recording medium realizes the function of the above-described embodiment, and the recording medium on which the program code is recorded constitutes the present invention.

Examples of the recording medium for supplying the program code include a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, and CD.
-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

The functions of the above-described embodiments are implemented when the computer executes the readout program codes, and the OS (operating system) running on the computer is executed based on the instructions of the program codes. ) Execute part or all of the actual processing, and the functions of the above-described embodiment are realized by the processing, thereby achieving the object of the present invention.

Further, after the program code read from the storage medium is written into the memory mounted on the function expansion board inserted into the computer or the function expansion unit connected to the computer, the program code is read. According to the present invention, the CPU or the like mounted on the function expansion board or the function expansion unit executes part or all of the actual processing based on the above, and the functions of the above-described embodiment are realized by this processing. Objective is achieved.

[0091]

According to the present invention, there is provided a first recording color group (for example, RGB) and a second recording color group (for example, CMY), and one color is selected from the first recording color group. When any one of the second recording color groups is superimposed on the selected color material, the first recording color group is selected from the first recording color group so as to have a predetermined achromatic color unique to the recording apparatus. By determining the color of the color material, the image quality is improved by reducing the graininess,
Further, since the amount of the recording agent used can be reduced, there is an effect that a decrease in image quality such as bleeding is reduced and a running cost is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an image processing system including a recording device according to an embodiment of the invention.

FIG. 2 is a block diagram illustrating an image processing operation in the embodiment.

FIG. 3 is an explanatory diagram of the above embodiment.

FIG. 4 is an explanatory diagram of the above embodiment.

FIG. 5 is a diagram showing the color of a gray line obtained by the recording apparatus 10 according to the above-described embodiment on an a ^* b ^* axis.

FIG. 6 shows input data R = G = B determined by a conventional method.
FIG. 14 is a diagram illustrating an example of CMYK output signals for = 0 to 255.

FIG. 7 shows how the color changes when magenta ink is added to the two types of green inks G1 and G2 shown in FIG. 4A, and the color change of the gray line of the printing apparatus shown in FIG. And FIG. 7 are diagrams simultaneously showing the situation.

FIG. 8 is an explanatory diagram of the above embodiment.

FIG. 9 is a diagram illustrating a relationship between lightness and saturation of a gray line of the recording apparatus 10 according to the embodiment.

FIG. 10 is a diagram showing a case where the relationship between lightness and chroma when the greens G3 and G4 shown in FIG. 8A and magenta are superimposed is further added to FIG. 9;

FIG. 11 is a flowchart showing the operation of the embodiment.

FIG. 12 is a flowchart specifically showing a step (S3) of determining a hue of a K-th special color in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Recording apparatus, 20 ... Host computer, 21 ... CPU, 22 ... Memory, 23 ... External storage, 24 ... Input unit, 25 ... Interface, 31 ... Color conversion processing unit, 32 ... Output gamma correction unit, 33 ... Quantization Processing unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/60 G06F 15/66 310 5C077 1/46 H04N 1/40 D 5C079 1/46 Z (72) Invention Person Yuji Akiyama 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term within Canon Inc. (reference) 2C056 EA05 EA11 EA24 EE03 EE09 2C262 AA02 AA24 AA25 AC02 BA01 BA14 BA18 BA20 BC19 EA11 FA18 2H086 BA04 CA01 CA08 CB07 CB12 CB16 CC01 CE13 CE17 CE18 CH07 CH20 5C074 AA02 BB16 DD24 FF15 HH10 5C077 LL17 LL19 MP08 PP15 PP32 PP33 PP36 PP37 PP38 PQ08 TT05 5C079 HB01 HB03 HB11 KA15 LA31 LB02 NA01 NA25 PA03

Claims (15)

[Claims] 1. A hue determining device for a special color in a color image recording apparatus for forming an image in multiple colors by adding a special color different from the basic color to the basic colors of cyan, magenta, and yellow. From the first recording color group composed of
Color material selecting means for selecting one color material; one color material in a second recording color group constituted by color materials other than the color materials constituting the first recording color group; When a color material selected from the first recording color group is superimposed,
Hue determining means for determining a hue of a color material selected from the first recording color group so as to obtain a unique gray in a printing apparatus to which a predetermined printing method is applied. A hue determination device for special colors for recording devices. 2. The recording medium according to claim 1, wherein the first recording color group is at least one color material of red, green, and blue, and the second recording color group is cyan, magenta, and yellow. A special color hue determination device for a recording device, which is a color material. 3. The recording medium according to claim 1, wherein the first recording color group is cyan, magenta, and yellow, and the second recording color group is at least one color material of red, green, and blue. An apparatus for determining a hue of a special color for a recording apparatus. 4. The apparatus according to claim 1, wherein the unique gray in the printing apparatus to which the printing method is applied is a color of black ink of the printing apparatus. 5. The printing method according to claim 1, wherein the specific gray in the printing apparatus to which the printing method is applied is a predetermined ratio of cyan, magenta, yellow or cyan, magenta, yellow, and black of the printing apparatus. A special color hue determination device for a recording device, characterized in that the color is a color that is expressed when overprinting is performed. 6. A method for determining a hue of a special color in a color image recording apparatus for forming an image in multiple colors by adding a special color different from the basic color to the basic colors of cyan, magenta and yellow, From the first recording color group composed of
A color material selecting step of selecting one color material; one color material in a second recording color group constituted by color materials other than the color material constituting the first recording color group; When a color material selected from the first recording color group is superimposed,
A hue determining step of determining a hue of a color material selected from the first recording color group so as to obtain a unique gray in a printing apparatus to which a predetermined printing method is applied. A method for determining the hue of a special color for a recording device. 7. The recording medium according to claim 6, wherein the first recording color group is at least one color material of red, green, and blue, and the second recording color group is cyan, magenta, and yellow. A method for determining a hue of a special color for a printing apparatus, characterized by being a color material. 8. The recording medium according to claim 6, wherein the first recording color group is cyan, magenta, and yellow, and the second recording color group is at least one color material of red, green, and blue. A method for determining a hue of a special color for a recording device, the method comprising: 9. The method for determining a hue of a special color for a printing apparatus according to claim 6, wherein the unique gray in the printing apparatus to which the printing method is applied is a color of black ink of the printing apparatus. 10. The printing method according to claim 6, wherein the specific gray in the printing apparatus to which the printing method is applied is a predetermined ratio of cyan, magenta, yellow or cyan, magenta, yellow, and black of the printing apparatus. A method for determining a hue of a special color for a recording apparatus, wherein the color is a color that is expressed when the printing is performed in a superimposed manner. 11. A method for determining a hue of a special color in a color image recording apparatus for forming an image in multiple colors by adding a special color different from the basic color to the basic colors of cyan, magenta, and yellow. From the first recording color group composed of
A color material selection procedure for selecting one color material; one color material in a second recording color group constituted by color materials other than the color material constituting the first recording color group; When a color material selected from the first recording color group is superimposed,
A hue determining step of determining a hue of a color material selected from the first recording color group so as to obtain a unique gray in a printing apparatus to which a predetermined printing procedure is applied; A computer-readable recording medium that has been recorded. 12. The recording medium according to claim 11, wherein the first recording color group is at least one color material of red, green, and blue, and the second recording color group is cyan, magenta, and yellow. A recording medium characterized by being a coloring material. 13. The recording medium according to claim 11, wherein the first recording color group is cyan, magenta, and yellow, and the second recording color group is at least one color material of red, green, and blue. A recording medium characterized by the following. 14. The recording medium according to claim 11, wherein the gray unique to the recording apparatus to which the recording procedure is applied is a color of black ink of the recording apparatus. 15. The printing apparatus according to claim 11, wherein the specific gray in the printing apparatus to which the printing procedure is applied is cyan, magenta, yellow or cyan, magenta, yellow, and black of the printing apparatus in a predetermined ratio. A recording medium characterized in that the color is a color that is expressed when overprinting is performed.