JP2003244455A - Image processor, image processing method, storage medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that colors within a monitor color reproduction area can match in the manner of sensations but the colors on a boundary of the monitor color reproduction area are not mapped as sharp colors in that case. <P>SOLUTION: In the image processing method for mapping and converting image data in the first color reproduction area expressed with a first color specification system into a second color reproduction area expressed with the same color specification system as said color specification system, image data in a first Most Saturated color in first color reproduction are mapped into second Most Saturated in the second color reproduction area. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing device, an image processing method, a storage medium and a program.

[0002]

2. Description of the Related Art Recently, with the spread of personal computers, desktop publishing (DTP) or home lab systems for managing color printer output of digital still camera images have come into widespread use at home. Along with this, a color reproduction technique in which a printer reproduces a color represented on a monitor by a computer by using an actual color material has become important. For example, in the DTP, in a computer system having a color monitor and a color printer, a color image is created / edited / processed on the monitor and output by the color printer. Here, the user strongly desires that the color image on the monitor and the printer output image match perceptually.

However, in the color reproduction technique, it is difficult to achieve such a perceptual match between a color image and a printer output image. This difficulty is due to the following reasons. In a color monitor, a color image is expressed by emitting light of a specific wavelength using a phosphor. On the other hand, in a color printer, light of a specific wavelength is absorbed by using ink or the like, and a color image is expressed by the remaining reflected light. Due to the different image display forms as described above, when the two are compared, the color reproduction regions are greatly different.
Further, even in the case of a color monitor, the color reproduction range is different between the liquid crystal monitor, the electron gun type cathode ray tube and the plasma type monitor. Even in a color printer, the color reproduction range is different due to the difference in paper quality and the amount of ink used. Therefore, in the image on the color monitor and the color printer output image, or in the color printer output image output on a plurality of types of models and a plurality of types of paper quality, the colors of these images are completely matched in the colorimetric sense. Is impossible. Therefore, when a human perceives a display color image on each output medium, a large difference is felt between the images.

Here, the perceptual difference of the display color image is absorbed between the display media having different color reproduction ranges,
As a technique for measuring the perceptual coincidence of display images, there is a gamut mapping technique that maps a certain color gamut into another color gamut using a uniform color system. As an example of gamut mapping technology, there is a non-linear gamut mapping that preserves the saturation of the low saturation part and the brightness of the middle brightness part and absorbs the difference in the gamut shape between the monitor color gamut and the printer color gamut. This is effective, and for example, Japanese Patent Laid-Open No. 2001-94799 proposed by the present applicant has been proposed. Further, Japanese Patent Laid-Open No. 2002-033929 has been proposed as a gamut mapping device that further advances and reduces pseudo contours and the like.

[0005]

However, according to the above-mentioned conventional gamut mapping method, since the perceptual coincidence between the color image on the monitor and the printer output image is targeted, only the printer image is subjectively evaluated. In some cases, it lacks vividness.

On the other hand, a printer user at home, in addition to seeking a perceptual match between a color image and a printer output image in a natural image or the like having many colors inside the monitor color reproduction area, has a problem that the color at the boundary portion of the monitor color reproduction area is It is hoped that a large number of graphic images will output vivid images even if perceptual matching is not achieved.

Therefore, there is a demand for a gamut mapping method that realizes perceptual coincidence in the colors inside the monitor color gamut and maps the colors at the boundary of the monitor color gamut into vivid colors.

[0008]

In order to solve the above problems, in the present invention, the image data of the first color gamut represented by the first color system is represented by the same color system as that of the color system. An image processing method for mapping conversion into a second color gamut represented by a color system, the first Most S in the first color reproduction.
It is characterized in that the image data of the saturated color is mapped to the second Most Saturated in the second color reproduction area.

(Operation) By providing the above-mentioned means, the brightest color in the monitor color reproduction area is reproduced as the brightest color in the printer gamut. Further, it is possible to achieve gamut mapping in which the colors inside the monitor color reproduction area are perceptually matched and the color at the boundary of the monitor color reproduction area is mapped to a vivid color.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> FIG. 1 is a block diagram showing a system configuration of a color signal conversion apparatus as a first embodiment of the present invention. In the above configuration, 1
01 is CPU, 102 is main memory, 103 is SCS
I interface, 104 network interface, 105 HDD, 106 graphic accelerator, 107 color monitor, 108 USB controller, 109 color printer, 110 keyboard / keyboard
A mouse controller, 111 is a keyboard, 112 is a mouse, 113 is a local area network, and 114 is a PCI bus.

In the above configuration, first, the image processing application stored in the HDD 105 is the CPU 101.
It is started by the command from. Subsequently, the image data stored in the HDD 105 is transferred to the main memory 102 via the PCI bus 114 via the SCSII / F 103 according to a command from the CPU 101 according to the processing in the image processing application. LAN
The image data stored in the server connected to the computer or the image data on the Internet is stored in the CPU 101.
P from the network I / F 104 by the command from
It is transferred to the main memory 102 via the CI bus 114. The image data held in the main memory 102 is stored in the PCI bus 11 according to a command from the CPU 101.
4 to the graphic accelerator 106. The graphic accelerator 106 D / A converts the image data and then transmits the image data to the color monitor 107 through the display cable, and the image data is displayed on the color monitor 107. Here, when the user instructs the image application to output the image held in the main memory 102 from the printer 109, the color reproduction range of an appropriate color monitor is calculated based on the color reproduction range mapping algorithm in the image application described later. The image information is converted based on the information and the appropriate color gamut information of the printer. Then, the image processing application transfers the converted image data to the printer driver. The CPU 101 performs CMYK processing on the image data by performing a predetermined color correction based on the printer driver program.
It is converted into image data and the CMYK image data is transmitted to the printer 109 via the USB controller 108. As a result of the above series of operations, the CMYK image is printed by the printer 109.

Among the image application operations in the above configuration, the image information conversion processing when outputting the image held in the main memory 102 from the printer 109 will be described.
This will be described with reference to the flowchart of FIG.

First, in step 201, the color reproduction information of the monitor is read by the HDD 105. The color reproduction information of the monitor is represented as correspondence information between the RGB color space and the L ^* a ^* b ^* color space. Specifically, from RGB to L ^* a ^* b
^It is configured as a mutual conversion program to ^* or a data string that describes the mutual correspondence. As the mutual conversion program, there is no code 8 based on the sRGB standard, for example.
RGB values in Bit representation and L ^{* in} floating point representation
The HDD 105 stores a processing routine using a predetermined calculation formula for mutually converting the a ^* b ^* value. The data describing the mutual correspondence is configured as a data string as shown in FIG. If the data value to be converted does not exist in the data string (there is no correspondence), it is calculated by interpolation.

In step 202, the color reproduction information of the printer is
The information is read by the HDD 105. The color of the printer
The current information is the same as the color reproduction information of the monitor, from RGB to L
^*a ^*b^*Mutual conversion program to, or mutual pairs
It is configured as data that describes the correspondence.

Next, at step 203, the converted image storage memory area is secured in order to store the image data being processed / processed. Next, at step 204, the RGB unsigned 8-bit image data held in the main memory 102 is converted into L ^* a ^* b ^* floating point data based on the color reproduction information of the monitor, and is stored in the converted image storage memory area. Store. Then based on the color gamut mapping to be described later in step ^205, the L ^* a * ^{b *} image data subjected to conversion to ^L * ^a * ^{b *,} and stores again the converted image storage memory area. Finally, in step 206, based on the color reproduction information of the printer, the L ^* a ^* b ^* image data in floating-point representation stored in the converted image storage memory area is converted into RGB image data in unsigned 8-bit representation. .

The processing of the image information conversion processing in step 205 described above will be described below with reference to the flowchart of FIG. The color gamut mapping is a mapping from the monitor gamut shown in FIG. 4 to the printer gamut shown in FIG. 4 and 5 show respective color reproduction areas in the L ^* a ^* b ^* color space.

At step 301, Most is changed for each hue.
A line representing a saturated color (hereinafter referred to as MSC line
In) is calculated and the information of the line (hereinafter referred to as MS) is calculated.
C line information). The MSC line is next
Is calculated using monitor color reproduction information. Monitor color
The reproduction information includes the RGB color space and L as described above.^*a^*b ^*
It is configured as correspondence information with the color space. Here, first
As shown in 6, the primary colors that are adjacent in the RGB color space
The MSC line is constructed as a straight line connecting the lines. Next before
Note MSC line is L^*a^*b^*Converting to color space
Therefore, most saturated in all hues
Monitor MSC line information indicating color distribution is configured.
The MSC line information is the point sequence data on the MSC line.
B-Spline curve data that approximates the MSC line
1-dimensional or higher-dimensional spline curve, rational B-Splin
It is composed of an e curve, a Bezier curve, and the like. Implementation
The monitor MSC line in the example is shown in FIG. Said rye
Is the same as the bold line in the monitor gamut in Fig. 4.
To hit.

Next, in step 302, step 301
Similarly, the printer MSC line information is constructed. That is, similar to FIG. 6, by constructing image data of MSC lines as straight lines connecting adjacent primary colors in the RGB color space, and converting the MSC lines into image data of L ^* a ^* b ^* color space, MostS in all hues
The printer MSC line information showing the saturated color distribution is constructed. The printer MSC line in this embodiment is shown in FIG. The line corresponds to the thick line in the printer gamut of FIG.

In this embodiment, the color reproduction information is converted into RGB.
Although it is defined as the correspondence between the color space and the L ^* a ^* b ^* color space, of course, instead of the RGB color space and the L ^* a ^* b ^* color space, the CMYK color space, the XYZ color space, and the L ^* u color space.
It is also possible to use the ^* v ^* color space or the like.

Finally, in step 303, the monitor MSC
Color gamut mapping is performed so that the line image data is mapped to the printer MSC line image data.

An example of the color gamut mapping in step 303 will be described below with reference to the flowchart of FIG. In the present embodiment, a continuous locus connecting a certain color and a certain color is called a gradation line. The main color gamut mapping is based on JP-A-2002-033929 in detail.

First, at step 901, sample points for defining the mapping of the color gamut are determined. The sample points are divided into surface sample points that define the mapping of the surface of the monitor color reproduction area and internal sample points that define the mapping inside the monitor color reproduction area. Here, at least two or more of the surface sampling points are located on the monitor MSC line. The surface sample points located on the MSC line are called MSC sample points.

Next, at step 902, mapping of the surface sampling points and the MSC sampling points to the printer color gamut is determined. Here, the MSC sample point is always the printer MS.
Mapped onto the C line. The mapping result of surface sample points other than the MSC sample points is not always located on the surface of the printer color reproduction area.

At step 903, regarding internal sampling points,
Define a mapping for the printer gamut. However, the mapping is controlled so that the mapping result of the internal sample points is always located inside the printer color gamut.

Subsequently, in step 904, the predetermined MS
A gradation line connecting the C sample points (hereinafter, MSC gradation line) is defined. The MSC gradation line is always located above the monitor MSC line.

Next, in step 905, a predetermined difference of 2
A gradation line connecting two surface sampling points (hereinafter referred to as surface gradation line) is defined.

In step 906, the MSC gradation line is mapped onto the printer MSC line defined in step 302.

In step 907, the surface gradation line is set to M.
It is mapped in the printer color reproduction area while being influenced by the mapping of the SC gradation line. The mapping is controlled so that the mapping result of the surface gradation line always becomes a continuous locus. The mapping result of the surface gradation line is not necessarily located on the surface of the printer color reproduction area.

At step 908, a gradation line connecting two predetermined different internal sampling points (hereinafter referred to as an internal gradation line) is defined.

In step 909, the internal gradation line is set to M
Mapping is performed in the printer color reproduction area while being affected by the mapping of SC gradation lines and surface gradation lines. The mapping is controlled so that the mapping result of the internal gradation line always has a continuous locus and is always located inside the printer color reproduction area.

To express the surface gradation line and the internal gradation line, any one or a plurality of types of B-Spline curve, various spline curves such as a spline curve of a linear degree or more, and Bezier curve are used.

According to the present embodiment, there is provided means for mapping the image data of the Most Gamut Color of the monitor gamut to the image data of the Most Gamut Color of the printer gamut. Furthermore, since the colors that are Most Mostaturated are used in the printer gamut, the result obtained by converting the line connecting the adjacent primaries in the RGB color space into the L * a * b * color space is used.
Defined as a saturated color. By virtue of mapping the color at the boundary of the monitor color reproduction area to the boundary at the printer color reproduction area, and in particular, mapping the most saturated color of the monitor gamut to the most saturated color of the printer gamut, vivid color reproduction is possible. Furthermore, by performing mapping for the purpose of perceptual matching inside the gamut, good color reproduction is possible even in a natural image.

Further, according to the present embodiment, since the color most truly saturated is used in the printer gamut, the line connecting adjacent primaries in the RGB color space is converted into the L ^* a ^* b ^* color space. The converted result is Mos
t Defined as a saturated color. The most vivid color in a printer gamut is L ^* a
^* B ^{* Although} not always the maximum saturation in a hue in the color space, the most vivid color in the monitor gamut can be reproduced with the most vivid color in the printer gamut regardless of such a problem.

<Second Embodiment> In the first embodiment, the Most Saturate of the monitor gamut is used.
The d color is the Printer Gamut Most Saturat
He focused on mapping to ed colors and did not pay particular attention to hue. In the present embodiment, by paying attention to the mapping of the hue component as well, it is possible to perform a good mapping in which the tint is preserved.

In this embodiment, the operation algorithm of the color gamut mapping in step 303 in the first embodiment is changed. Therefore, the description of the apparatus that overlaps with the first embodiment is omitted, and only the operation algorithm of the color gamut mapping in step 303 will be described.

First, in step 1001, it is judged whether or not the color S to be mapped is a color located on the monitor MSC line, and if it is located, the process proceeds to step 1002.
If not located, jump to step 1003.

In step 1002, the color S is mapped to a color on the printer MSC line and having the same hue as the color S. The mapping calculation is performed by calculating the intersection of a curve / straight line and a plane.

In step 1003 and the subsequent steps, the color S is mapped from the monitor color reproduction area to the printer color reproduction area by the calculation over a plurality of steps. FIG. 11 shows a comparison between the monitor color gamut and the printer color gamut for a certain hue. Here, the alternate long and short dash line represents the monitor color gamut and the solid line represents the printer color gamut. Incidentally, the mapping operation in step 1003 and thereafter is based on Japanese Patent Laid-Open No. 2001-94799, and the details are here.

First, in step 1003, the lightness component Ls, the saturation component Cs, and the chromaticity component Hs are separated from the mapping target S.

Subsequently, at step 1004, only the separated lightness component Ls and the separated chroma component Cs are mapped. The result of mapping the monitor color gamut by this step is called the first intermediate color gamut. Here, the relationship between the monitor color reproduction area and the first intermediate color reproduction area in a certain hue is shown in FIG. The dashed-dotted line represents the monitor color gamut, the solid line represents the first intermediate color gamut, and the broken line represents the printer color gamut.

Next, in step 1004, for adjusting the brightness,
The lightness is mapped again. The result of mapping the monitor color gamut by this step is called the second intermediate color gamut. Here, FIG. 13 shows the relationship between the first intermediate color gamut and the second intermediate color gamut in a certain hue. The dashed-dotted line represents the first intermediate color gamut, the solid line represents the second intermediate color gamut, and the broken line represents the printer color gamut.

In step 1005, saturation is mapped with a constant lightness. By this step, the second intermediate color gamut is mapped to the printer color gamut. Here, FIG. 14 shows the relationship between the second intermediate color gamut in a certain hue and the final mapping result. The alternate long and short dash line represents the second intermediate color gamut, and the solid line represents the final mapping result.

According to the present embodiment, by mapping the most saturated color of the monitor gamut to the most saturated color of the printer gamut, vivid color reproduction is possible and, in addition, the hue is maintained. Color does not change. Therefore, the effect of being vivid and not impairing the perceptual agreement can be obtained.

<Third Embodiment> In the second embodiment, Most Saturat of the monitor gamut is used.
ed colors in printer gamut Most Satura
Preservation of the hue component was also realized by mapping to ted colors. In the present embodiment, by further finely adjusting the hue component, it is possible to realize a color gamut mapping capable of more preferable color reproduction.

In this embodiment, the operation algorithm of the color gamut mapping at step 303 in the first embodiment is changed. Therefore, the description of the apparatus overlapping with that of the first embodiment will be omitted, and only the operation algorithm of the color gamut mapping in step 303 will be described.

First, in step 1501, it is judged whether or not the color S to be mapped is a color located on the monitor MSC line, and if it is located, step 1002 follows.
If not located, jump to step 1003.

In step 1502, the hue of the color S is converted. For the hue conversion, for example, an input / output function as shown in FIG. 16 is used. Here, the hue angle is expressed in radian notation in which the positive direction of the a ^* axis is 0 rad in the a ^* b ^* chromaticity coordinate system and the counterclockwise rotation is positive.

In step 1503, a color is mapped onto the printer MSC line to a color having the same hue as the hue-converted color S. The mapping calculation is performed by calculating the intersection of a curve / straight line and a plane.

In step 1504 and subsequent steps, the color S is mapped from the monitor color gamut to the printer color gamut by the calculation over a plurality of steps. 12 shows a comparison between the monitor color reproduction area and the printer color reproduction area in the hue shown in FIG. still,
The mapping calculation after step 1504 is disclosed in Japanese Patent Laid-Open No. 2001-9.
It is based on No. 4799, and details can be found here.

First, in step 1504, the lightness component Ls, the saturation component Cs, and the chromaticity component Hs are separated from the S to be mapped. Subsequently, in step 1505, the hue of the color S is converted. Subsequently, at step 1506, only the separated lightness component Ls and only the separated chroma component Cs are mapped, and mapped to the first intermediate color reproduction range.

Next, in step 1507, for brightness adjustment,
The lightness is mapped again, and the second intermediate color gamut is mapped.

In step 1508, saturation is mapped with constant lightness. By this step, the second intermediate color gamut is mapped to the printer color gamut. Incidentally, the above Examples 1 to 1
In FIG. 3, the expression “Most Characterized” is used, which is Mo for the purpose of the present invention of mapping the color of the monitor color gamut boundary portion to a vivid color.
It is obvious that only the color of the st Saturated point may be displayed, or the color within the predetermined range that can be regarded as the Most Saturated may be displayed.

According to the present embodiment, the most saturated color of the monitor gamut is mapped to the most saturated color of the printer gamut, so that vivid color reproduction is possible and, in addition, the hue is maintained. Color does not change. Therefore, the effect of being vivid and not impairing the perceptual agreement can be obtained.

(Other Embodiments) Further, in the above-described first to third embodiments, although the hardware constituting the network is included, it can be realized by the software which sequentially executes each data processing. That is, a storage medium (or recording medium) recording a program code of software that realizes the functions of the above-described embodiments is supplied to a system or apparatus, and the computer (or CPU or MPU) of the system or apparatus supplies Needless to say, this is also achieved by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the function of the above-described embodiment,
The program code is stored and can be written in various storage media such as CD, MD, memory card, and MO.

Further, by executing the program code read out by the computer, not only the functions of the above-described embodiment are realized, but also the operating system running on the computer based on the instruction of the program code ( Needless to say, this includes a case where the OS) performs some or all of the actual processing and the processing realizes the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written in the memory provided in the function expansion card inserted in the computer or the function expansion unit connected to the computer, based on the instruction of the program code, It goes without saying that a case where a CPU or the like included in the function expansion card or the function expansion unit performs a part or all of the actual processing and the processing realizes the functions of the above-described embodiments is also included.

[0057]

As is apparent from the above description, according to the present invention, the Most Gamut of the monitor gamut is
Most Colors in Printer Gamut
By providing a means for mapping to d color, the color at the boundary of the monitor color reproduction area is reproduced with the brightest color in the printer gamut.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a first embodiment of the present invention.

FIG. 2 is a flowchart showing an image information conversion processing operation in the image application operation according to the first embodiment of this invention.

FIG. 3 is a step 205 in the first embodiment of the present invention.
FIG. 6 is a flowchart showing a color gamut mapping operation in FIG.

FIG. 4 is a schematic diagram showing a monitor gamut.

FIG. 5 is a schematic diagram showing a monitor gamut.

FIG. 6 is a diagram showing a line connecting adjacent primaries in an RGB color space.

FIG. 7 is a schematic diagram showing an example of a monitor MSC line.

FIG. 8 is a schematic diagram showing an example of a printer MSC line.

FIG. 9 is a flowchart showing a color gamut mapping operation in step 303 in the first embodiment of the invention.

FIG. 10 is a flowchart showing a color gamut mapping operation in step 303 in the second embodiment of the present invention.

FIG. 11 is a schematic diagram of a monitor color reproduction area and a printer color reproduction area in a certain hue.

FIG. 12 is a schematic diagram of a monitor color reproduction area and a first intermediate color reproduction area in a certain hue.

FIG. 13 is a schematic diagram of a first intermediate color reproduction region and a second intermediate color reproduction region in a certain hue.

FIG. 14 is a schematic diagram of a second intermediate color gamut in a hue and a final mapping result.

FIG. 15 is a flowchart showing a color gamut mapping operation in step 303 in the third embodiment of the invention.

FIG. 16 is an example of an input / output function for hue mapping.

FIG. 17 is an example of a data string describing mutual conversion between RGB values represented by 8-bit representation and L ^* a ^* b ^* values represented by floating-point representation.

[Explanation of symbols]

101 CPU 102 main memory 103 SCSI I / F 104 Network I / F 105 HDD 106 graphic accelerator 107 color monitor 108 USB controller 109 color printer 110 keyboard / mouse controller 111 keyboard 112 mice 113 LAN 114 PCI bus 115 Color signal converter

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5B057 CA01 CA08 CA12 CA16 CB01                       CB08 CB12 CB16 CE17 CE18                       CH07                 5C077 LL01 MP08 PP32 PP33 PP36                       PQ08 PQ12 PQ25                 5C079 HB01 HB03 HB08 HB12 LA31                       LB02 MA02 NA03 NA05 NA17

Claims (17)

[Claims] 1. Image conversion of image data of a first color gamut represented by a first color system into a second color gamut represented by the same color system as the color system. An image processing method, comprising: a first Most Satur in the first color reproduction;
An image processing method, characterized in that image data of an aerated color is mapped to a second Most Saturated in the second color reproduction area. 2. Most S in the first color reproduction
When the image data of the saturated color is mapped to the Most Saturated in the second color reproduction area, the Most Satur in the first color reproduction is performed.
The first of how rated colors are distributed in all hues
Of the line information of M, and M in the second color reproduction
The image processing method according to claim 1, wherein second line information indicating how the ost saturated color is distributed in all hues is configured and used for mapping. 3. The image processing method according to claim 2, wherein the first line information is composed of point sequence information based on a plurality of sample points on the line. 4. The first line information is B-Spli.
The image processing method according to claim 2, wherein the image processing method is represented by using any one type or a plurality of types of a ne curve, a rational B-Spline curve, a Bezier curve, and a spline curve of linear degree or higher. 5. The image processing method according to claim 1, wherein a uniform color system is used as the first color system. 6. The image processing method according to claim 5, wherein an L ^* a ^* b ^* color system or an L ^* u ^* v ^* color system is used as the uniform color system. 7. The most saturated color is a color on a line connecting adjacent primary colors when a first color gamut is expressed by another second color system,
7. The image processing method according to claim 1, wherein the image processing method is obtained by converting to the color system of. 8. The image processing according to claim 7, wherein when the color on the line connecting the primary colors is converted into the first color system, the color is converted using a predetermined calculation formula. Method. 9. When converting a color on a line connecting the primary colors into a first color system, a correspondence relationship between values in the first color system and values in the second color system is set. The value is stored in the storage unit, the value in the first color system is converted to the value in the second color system by using the correspondence, and when the correspondence does not exist in the storage unit, an interpolation operation is performed. The image processing method according to claim 7, which is calculated. 10. The image processing method according to claim 7, wherein an RGB color system, a CMY color system or a CMYK color system is used as the second color system. 11. Image data located within a first color gamut represented by a first color system is located within a second color gamut represented by the same color system as the color system. An image processing method for performing mapping conversion to image data for converting a trajectory of color change in the first color reproduction area using a curve, performing mapping on the curve, and corresponding curves before and after mapping. The color gamut is mapped using the relationship, and the Most Saturate in the first color reproduction is performed.
First line information indicating how d colors are distributed in all hues is configured, and Most in the second color reproduction is configured.
The second line information indicating how the saturated color is distributed in all the hues is given, and the color gamut is mapped so that the image data of the first line becomes the image data of the second line. An image processing method characterized by the above. 12. Most in the first color reproduction
Map the saturated color to the Most Colored in the second color gamut, and
Image data to be processed that is not Saturated is separated into a lightness component and a saturation component, respectively, and mapping conversion is performed independently, and after the conversion, the lightness component is mapped for adjustment, and the saturation component is mapped for adjustment. The image processing method according to claim 1, wherein conversion is performed. 13. The first Mo in the first color reproduction
The image data of the st Saturated color is converted into the second Most Saturat in the second color gamut.
When mapping to an ed color, the first Most Satur
The hue of the image data of the rated color and the second Mos
The image processing method according to claim 1, wherein the images are mapped so that the hues of the t Saturated colors are the same. 14. The first Mo in the first color reproduction
The image data of the st Saturated color is converted into the second Most Saturat in the second color gamut.
When mapping to an ed color, the first Most Satur
2. The image processing method according to claim 1, wherein after adjusting the hue with respect to the hue of the image data of the rated color, the image is mapped so as to be the same as the adjusted hue in the second most saturated color. . 15. Image conversion of image data of a first color gamut represented by the first color system into a second color gamut represented by the same color system as the color system. A code and a first Most Satur in the first color reproduction
A storage medium having a code for mapping image data of an aged color to a second Most Saturated in the second color reproduction area. 16. Image conversion of image data of a first color gamut represented by a first color system into a second color gamut represented by the same color system as the color system. A code and a first Most Satur in the first color reproduction
A program having a code for mapping image data of an aged color to a second Most-Saturated in the second color reproduction area. 17. Image conversion of image data of a first color gamut represented by the first color system into a second color gamut represented by the same color system as the color system. Means, a first Most Satur in the first color reproduction
An image processing apparatus comprising: means for mapping image data of an aged color to a second Most Saturated in the second color reproduction area.