JP2019184346A - Toning assistance system, toning assistance method, and program - Google Patents

Abstract

To provide a toning assistance system with which it is possible to present best toning in a gamut of a coloring material provided with the result of toning for obtaining a reproduction color that corresponds to a sample color and perform toning such that the reproduction color presented by each of a plurality of expert color mixers is recognized as having the same hue.SOLUTION: The present invention includes an off-gamut determination information generation unit for finding off-gamut determination information to determine the chromaticity of a reproduction color that corresponds to off-gamut when the chromaticity of a sample color is outside of the gamut of a coloring material for toning a reproduction color. The off-gamut determination information includes a permissible plane, in a permissible range, in the Labcoordinate system of a color space, which is defined by a hue angle range indicating the range of hue angles formed by a projection line that is a straight line linking the origin of the Labcoordinate system and the chromaticity of the sample color and projected to aband an LC angle range indicating the range of LC angles formed by an LC plane and a straight line in an LC (luminosity chroma) plane comprising an Laxis and the projection line.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a toning support system, a toning support method, and a program for supporting evaluation of a toning result of ink when reproducing a color corresponding to a sample color.

2. Description of the Related Art Conventionally, a plurality of color materials are directly mixed in printing ink, paint, resin, etc., and the color desired by the client is reproduced and provided.
In this color reproduction, the difference in color between the target color and the reproduced color is visually or measured, and the pass / fail of the reproduced color is determined based on the difference in color (for example, see Patent Document 1).
When visually determining the color difference between the target color and the reproduced color, the pass / fail determination largely depends on the experience and skill of the toning technician, and causes a variation in toning quality. For this reason, the reproduced color is measured and digitized, and an objective pass / fail determination is performed based on the difference between the numerical values of the target color and the reproduced color (see, for example, Patent Document 2 and Patent Document 3).

When the target color and the reproduction color described above are digitized and the difference between the target color and the reproduction color is objectively determined based on the numerical value, the pass / fail determination is made by determining each color in the L ^* a ^* b ^* color system. In many cases, ΔE or ΔE2000, which is a color difference, is calculated from the numerical value of L ^* a ^* b ^* (coordinate value indicating chromaticity), and the pass / fail of the toning result is determined based on the numerical value of the color difference.
However, many of the target colors are, for example, a paper sample printed on a paper print medium such as a DIC color guide (manufactured by DIC Graphics Co., Ltd.), or a color sample printed on a print medium such as metal or plastic. In many cases, a type different from the base print medium used for the reproduction color is used.

For this reason, the reproduction color, especially the reproduction color of printing ink, has a thin film thickness of several microns even if it is thick, so that the reproduction color has an influence on the color of the underlying printing medium. Receive a lot.
In many cases, the color material used for the sample color cannot be used for the reproduced color due to problems of cost and durability. For this reason, a color material satisfying cost and durability is used, but there are cases in which the sample color cannot be reproduced in the color gamut of the color material.
Even when this reproduction is impossible, it is required to perform toning to obtain a reproduction color corresponding to the sample color desired by the client.

JP-T-2004-506187 JP-A-4-314768 JP 2005-521806

When obtaining a reproduction color corresponding to the sample color desired by the client, if the color adjustment such as ΔE or ΔE2000 is simply made small in order to bring the reproduction color closer to the color of the sample color, the client The sample color and the reproduced color are not recognized as similar colors.
For this reason, if the chromaticity of the sample color exists outside the color gamut range (outside the color gamut) of the color material used for toning the reproduced color, it is considered impossible to make a pass / fail judgment using numerical values using color differences. An experienced toning person visually checks the sample color and the reproduced color, and performs the toning of the coloring material to achieve the reproduced color with his own sensitivity so that the same color can be obtained. Yes.

As described above, a veteran toning person has the ability to perform toning to obtain a reproduction color corresponding to the sample color desired by the client in accordance with the color material to be used.
However, the best toning is performed and the best reproduction color is provided to the client, but the experienced toning person is the means to prove that the toning is the best in the color gamut of the given colorant There is no. For this reason, if the client does not have knowledge of the color toning of the coloring material or the ability to observe the color, the slight difference between the sample color and the color of the reproduced color is recognized as the result of insufficient toning, meaningless. Re-coloring request occurs.

  In addition, each of the experienced color adjusters often provides the client with the best reproduction color for a given colorant. However, each of the experienced color adjusters implements reproduction colors with their own sensibilities. Therefore, when matching sample colors with chromaticities outside the color gamut with color reproductions within the color gamut, different tonings are used. Is performed, the chromaticity of the reproduced color is different, and it is impossible to obtain a reproduced color having the same color with respect to the same color sample.

  The present invention has been made in view of the above-described points, and can present the best toning in the color gamut of a color material to which a toning result for obtaining a reproduction color corresponding to a sample color is given, and It is an object of the present invention to provide a toning support system, a toning support method, and a program capable of performing a toning in which reproduced colors provided by each of a plurality of experienced toning persons have a similar color tone. .

The present invention has been made to solve the above-described problems, and the toning support system according to the present invention provides a reproduction color gamut in which the chromaticity of the sample color is within or outside the color gamut of the color material used for adjusting the reproduction color. A reproduction color information obtaining unit that obtains information; and the reproduction color gamut information indicates that the chromaticity of the sample color is within the color gamut, and determines the chromaticity of the reproduction color corresponding to the color gamut. In-gamut determination information generation unit for determining determination information, and when the reproduction color gamut information indicates that the chromaticity of the sample color is out of the color gamut, the chromaticity of the reproduction color corresponding to out of the color gamut is determined. Out-of-gamut determination information generation unit for obtaining out-of-gamut determination information, and if within the color gamut, whether or not the chromaticity of the reproduced color is included in an allowable range indicated by the in-gamut determination information, and out of the color gamut In some cases, the chromaticity of the reproduced color is an allowable range indicated by the out-of-gamut determination information. A reproduction color determination unit that determines whether the color is included, and a determination result presentation unit that presents a determination result whether the chromaticity of the reproduction color is included in the allowable range, each region determination information and the color gamut determination information, in the allowable range, the L ^* a ^* b ^* coordinate system of the color space, and the L ^* a ^* b ^* coordinate system origin to the sample color chromaticity A hue angle range indicating a range of hue angles formed by a projection line projected on the a ^* b ^* plane, and the projection line on the L ^* axis and the LC (lightness saturation) plane with the projection line as an axis And an allowable plane defined by an LC angle range indicating an LC angle range formed by the straight line.

In the toning support system of the present invention, the out-of-gamut determination information generation unit forms the allowable plane including an intersection of the color gamut of the color material and the straight line by the hue angle range and the LC angle range. It is characterized by.
In the toning support system of the present invention, each of the hue angle range and the LC angle range includes an L ^* axis indicating lightness in the L ^* a ^* b ^* coordinate system, the origin, and an a ^* value of the sample color. And a C axis indicating the saturation, which is the projection line connecting the coordinate points of the b ^* value, and a hue angle H formed by the a ^* axis and the C axis counterclockwise on the a ^* b ^* plane. It is set in the LCH color system that is used.

  In the toning support system of the present invention, the determination result presenting unit determines the chromaticity according to the mixing ratio of each ink type, which is obtained by CCM (Computer Color Matching), in the color gamut of the color material. The information or the allowable range of the out-of-gamut determination information is presented.

  The toning support system according to the present invention is characterized in that the hue angle range and the LC angle range are determined as ranges perceived as similar colors in an experiment by visual recognition by a plurality of toning persons. .

The toning support method according to the present invention includes a reproduction color information acquisition process in which the reproduction color information acquisition unit obtains reproduction color gamut information of whether the chromaticity of the sample color is within or outside the color gamut of the color material used for adjusting the reproduction color. The in-gamut determination information generation unit determines the chromaticity of the reproduction color corresponding to the gamut when the reproduction gamut information indicates that the chromaticity of the sample color is in the gamut. The in-gamut determination information generation process for obtaining information and the out-of-gamut determination information generation unit, when the reproduction color gamut information indicates that the chromaticity of the sample color is out of the color gamut, the reproduction corresponding to the out-of-gamut When the out-of-gamut determination information generation process for determining out-of-gamut determination information for determining the chromaticity of the color and the reproduction color determination unit are within the color gamut, the chromaticity of the reproduction color is an allowable range indicated by the in-gamut determination information Or the chromaticity of the reproduced color if it is out of the color gamut. The reproduction color determination process for determining whether or not the color is included in the allowable range indicated by the out-of-gamut determination information, and the determination result presentation unit determines whether or not the chromaticity of the reproduction color is included in the allowable range. and a determination result presentation step of presenting the determination result, each of the color gamut determination information and the color gamut determination information, in the allowable range, the L ^* a ^* b ^* coordinate system of the color space, the L ^* a ^* B ^* A hue angle range indicating a hue angle range formed by a projection line obtained by projecting a straight line connecting the origin of the coordinate system and the chromaticity of the sample color onto the a ^* b ^* plane, and the L ^* axis and the projection line It includes an allowable plane defined by an LC angle range indicating an LC angle range formed by the projection line and the straight line on an LC (lightness saturation) plane as an axis.

The program according to the present invention provides a computer with reproduction color information obtaining means for obtaining reproduction color gamut information for whether the chromaticity of the sample color is within or outside the color gamut of the color material used for adjustment of the reproduction color, and the reproduction color gamut information is the When the chromaticity of the sample color indicates that it is within the gamut, the in-gamut determination information generating means for obtaining in-gamut determination information for determining the chromaticity of the reproduced color corresponding to the gamut, and the reproduced gamut information is When the chromaticity of the sample color indicates that it is out of the color gamut, out-of-gamut determination information generating means for obtaining out-of-gamut determination information for determining the chromaticity of the reproduced color corresponding to the out-of-gamut is within the color gamut In this case, whether or not the chromaticity of the reproduced color is included in the allowable range indicated by the in-gamut determination information, and if the chromaticity of the reproduced color is out of the gamut, the allowable range indicated by the out-of-gamut determination information Reproduction color determination to determine whether it is included in Each of the in-gamut determination information and the out-of-gamut determination information is a program executed as a determination result presentation unit that presents a determination result as to whether or not the chromaticity of the reproduced color is included in the allowable range. However, within the allowable range, in the L ^* a ^* b ^* coordinate system of the color space, a straight line connecting the origin of the L ^* a ^* b ^* coordinate system and the chromaticity of the sample color is projected onto the a ^* b ^* plane. A hue angle range indicating a range of hue angles formed by the projected line, and an LC angle range formed by the projection line and the straight line on an L ^* axis and an LC (lightness saturation) plane with the projection line as an axis. It is a program which makes the said tolerance | permissible_range including the tolerance | permission plane prescribed | regulated from LC angle range to show.

  According to the present invention, it is possible to present that the toning result for obtaining the reproduction color corresponding to the sample color is the best toning in the color gamut of the given color material, and each of the plurality of experienced toning persons Can provide a toning support system, a toning support method, and a program capable of performing a toning where the reproduced color provided is visually recognized as a similar color.

It is a figure which shows the hue angle range Hw which is the tolerance | permissible_range of chromaticity with respect to the hue angle H in the two-dimensional coordinate system a ^* b ^* which comprises the L ^* a ^* b ^* coordinate system in this invention. In the present invention, a lightness / saturation angle range LCw indicating an allowable range of the lightness / saturation angle LC in the two-dimensional coordinate system L ^* C ^* composed of the L ^* axis and the C ^* axis in the L ^* a ^* b ^* coordinate system is represented. FIG. It is a figure which shows the tolerance | permissible_range of the chromaticity of the reproduction color which accept | permits target chromaticity prescribed | regulated by the hue angle range and the lightness saturation angle range. FIG. 6 is a diagram for explaining an allowable range area formed by an allowable range plane area 200 when the color gamut of the color material does not include the chromaticity of the sample color. FIG. 3 is a block diagram illustrating a configuration example of a toning support system that supports toning processing that performs color matching by blending colors of color materials that reproduce sample colors using out-of-gamut determination information that is an embodiment of the present invention. . It is a figure which shows the structural example of the determination information data table previously written and memorize | stored in the memory | storage part. It is a figure of the display screen which shows a response | compatibility with the chromaticity of the reproduction color which the determination result presentation part 16 presents, and an allowable range. It is a flowchart which shows the operation example of the process of the toning of the reproduction color corresponding to the sample color by the toning support system by this embodiment. It is a figure which shows the structural example which performs the remote color matching using the color matching assistance system by this embodiment. It is a sequence diagram explaining an example of the remote toning process performed using the toning support system 1 of this embodiment.

In the present invention, when toning a sample color with a predetermined color material (for example, a predetermined type of ink) and reproducing the color as a reproduced color, the chromaticity of the reproduced color is higher than the chromaticity of the sample color. The guideline for judging whether the color is adjusted within the satisfactory range is presented.
Prior to the description of the embodiment, a determination criterion (determination information) in the present invention for performing an objective pass / fail determination of a reproduction color generated by toning corresponding to a sample color will be described below.

FIG. 1 is a diagram showing a hue angle range Hw which is an allowable range of chromaticity with respect to the hue angle H in the two-dimensional coordinate system a ^* b ^* constituting the L ^* a ^* b ^* coordinate system in the present invention.
In FIG. 1, a straight line L1 is, for example, a straight line (half straight line, saturation C ^* axis) that starts from the origin of the two-dimensional coordinate system a ^* b ^* and passes through the hue coordinate A. Here, the hue coordinate A is a coordinate value (a ^* , b ^* ) indicating the hue (hue angle H) and saturation (distance from the origin of the two-dimensional coordinate system a ^* b ^* ) of the sample color.

The hue angle H described above is an angle formed by the straight line L1 and the a ^* axis in the two-dimensional coordinate system a ^* b ^* . The hue angle range Hw includes a first hue angle range Hw_1 and a second hue angle range Hw_2 provided on both sides of the straight line L1. Each of the first hue angle range Hw_1 and the second hue angle range Hw_2 may be the same angle range. However, one of the first hue angle range Hw_1 and the second hue angle range Hw_2 is wider than the other in accordance with the allowable range of human color change in the hue movement direction. It may be narrowed or narrowed. The hue angle range Hw is based on observations in a toning experiment by a plurality of experienced toning persons, within a range of ± 5 °, preferably within a range of ± 3 °, with high accuracy around the straight line L1. If necessary, set within ± 1 °.
The above-described hue angle range Hw is obtained by observing a printed material of a predetermined color material for each type of color material, for example, by a plurality of experienced color adjusters, etc. The range of hue angles to be determined is determined in advance.

FIG. 2 shows the lightness saturation indicating the allowable range of the lightness saturation angle LC in the two-dimensional coordinate system L ^* C ^* composed of the L ^* axis and the C ^* axis in the L ^* a ^* b ^* coordinate system of the present invention. It is a figure which shows the angular range LCw. FIG. 2 explains the concept of the LCH color system used for evaluation of toning in the present embodiment. The LCH color ^system, L ^* a * ^{b *} and ^{L *} axis indicating lightness in a coordinate ^system, a * ^{b *} from ^{a *} axis in the coordinate system, the coordinates of the origin and sample color ^{a *} and ^{b *} values It is composed of an angle formed counterclockwise to a line segment (C axis) connecting points, that is, a hue angle H indicating a hue angle, and the C axis formed at a hue angle H indicating saturation. . This saturation is the distance between the origin on the C axis and the coordinate point of the a ^* value and b ^* value. In the present embodiment, the color perceived by humans is determined (or evaluated) by the LCH color system composed of lightness L, hue H, and saturation C with respect to the toning result.
This lightness / saturation angle range LCw is also sensitive to changes in lightness as the saturation increases, in the same way that human vision becomes less sensitive to changes in hue as the saturation in the hue angle range Hw increases. This is a criterion developed by the inventor of the present invention based on the assumption that human vision is insensitive.
The straight line L2 is a straight line that starts from the origin and passes through the chromaticity coordinates B of the sample color in the L ^* a ^* b ^* coordinate system. When the chromaticity coordinates B are projected onto the a ^* b ^* coordinate system, the chromaticity coordinates A indicating the hue and saturation, which are the basis for forming the saturation C ^* axis, are obtained.

The lightness / saturation angle range LCw described above includes a first lightness / saturation angle range LCw_1 and a second lightness / saturation angle range LCw_2 provided on both sides of the straight line L2. Each of the first lightness saturation angle range LCw_1 and the second lightness saturation angle range LCw_2 may be the same angle range as in the case of the hue angle range Hw, but an allowable range of human color change in the lightness movement direction. Correspondingly, one may be made wider or narrower than the other. As in the case of the hue angle range Hw, the lightness / saturation angle range LCw is preferably within a range of ± 5 ° centered on the straight line L2 based on observation in the toning experiment of a plurality of experienced toning persons. Set within the range of ± 3 °, and within the range of ± 1 ° when high accuracy is required.
For this reason, in the lightness / saturation angle range LCw, similarly to the hue angle range Hw, a plurality of experienced color adjusters and the like observe the printed material of a predetermined color material for each type of color material. Thus, the range of the lightness and saturation angle that is visually perceived with the same color is determined in advance.

FIG. 3 is a diagram showing an allowable range plane area of the chromaticity of the reproduced color that allows the target chromaticity, which is defined by the hue angle range and the lightness / saturation angle range. The allowable range plane region 200 includes straight lines L3_1 and L3_2 indicating the hue angle range Hw and straight lines L4_1 and L4_2 indicating the lightness / saturation angle range LCw with the origin as the top vertex in the L ^* a ^* b ^* coordinate system. In the quadrangular pyramid-shaped space to be formed, it is formed perpendicular to a straight line connecting the origin and the coordinate value of the sample color. Further, if the chromaticity of the sample color is included in a color gamut (hereinafter simply referred to as color gamut) of the color material in the square pyramid-shaped space, the allowable range plane region 200 has the chromaticity of the sample color. It is formed at a position including coordinates B.

  That is, the point that touches each of the straight lines L3_1, L3_2, L4_1, and L4_2 becomes the apex of the bottom surface. As a result, the allowable range plane area 200 is determined according to the shape of the quadrangular prism and the chromaticity of the sample color, and is set as one of in-gamut determination information indicating the allowable range for the chromaticity of the sample color. The When the chromaticity of the sample color is included in the color gamut of the color material, the allowable range upper limit region 200_2 including the allowable range plane region 200 as the reference plane is used as the bottom surface to include the allowable value for the saturation of the sample color. The tolerance range solid region 200B having a quadrangular prism shape (square pyramid) formed with the tolerance range lower limit region 200_1 as an upper surface is used as the in-gamut determination information. In this allowable range three-dimensional area 200B, the distance between the allowable range plane area 200 and the allowable range upper limit area 200_2 is set larger than the distance between the allowable range lower limit area 200_1 and the allowable range flat area 200. That is, the allowable range on the high saturation side of the allowable range solid region 200B is set wider than the allowable range on the low saturation side with respect to the allowable range plane region 200 of the reference surface.

On the other hand, when the chromaticity of the sample color is not included in the color gamut, the coordinate point is moved from the chromaticity coordinate B on the straight line L2 with respect to the origin, and the moved coordinate point is the color gamut of the color material. The coordinates of the position included in the outermost shell (the outer peripheral surface of the three-dimensional shape of the color gamut) are defined as the chromaticity coordinates B ′ of the pseudo sample color. Then, the allowable range plane region 200 is generated as out-of-gamut determination information at a position including the chromaticity coordinate B ′.
FIG. 4 is a diagram for explaining an allowable range area formed by the allowable range plane area 200 when the color gamut of the color material does not include the chromaticity of the sample color. FIG. 4A shows the positional relationship between the allowable range plane region 200 at the coordinate B ′ and the shape of the outermost shell 301 in the color gamut of the color material.

That is, FIG. 4A shows a cross section near the chromaticity coordinate B and the chromaticity coordinate B ′ of FIG. 3 by a plane that includes the straight line L2 and is perpendicular to the allowable range plane region 200. In general, the three-dimensional shape of the outermost shell of the color gamut shows a shape with irregularities as shown in FIG.
Larger convex outermost shell portions 301 </ b> _A and 301 </ b> _B intersect the tolerance range plane region 200 with respect to the position of the coordinate B ′ where the tolerance range plane region 200 is in contact.

  FIG. 4B shows a cut surface obtained by cutting the outermost shell 301 in the color gamut of the color material in FIG. The cut surface of the outermost shell portion 301_A by the allowable range plane region 200 becomes the allowable range region 201_A, and the cut surface of the outermost shell portion 301_B becomes the allowable range region 201_B. That is, the color gamut of the color material included in the allowable range plane area 200 is the allowable range area 201 configured by each of the allowable range area 201_A and the allowable range area 201_B. Thereby, the allowable range area 201 is determined corresponding to the position of the allowable range plane area 200 in the outermost shell, and is set as out-of-gamut determination information indicating the allowable range for the chromaticity of the sample color.

Through the above-described processing, the coordinate B ′ of the best chromaticity within the color gamut of the color material is obtained with respect to the chromaticity coordinate B indicating the chromaticity of the sample color. Similarly, an allowable range area 201 for visualizing is set.
Thus, by using the out-of-gamut determination information, when the chromaticity of the sample color presented by the user is out of the color gamut in the reproducible color gamut of the color material specified by the user, the sample color desired by the user is obtained. By obtaining the chromaticity of the pseudo sample color with the closest saturation and indicating that the out-of-gamut determination information is satisfied, the toning process of the color material for reproducing the chromaticity of the pseudo sample color is performed. It is possible to objectively indicate to the user that the process has been performed appropriately.

  Also, by using out-of-gamut determination information, when the color material is adjusted at different timings or at different factories for the pseudo sample color, and the adjusted color material is printed on a predetermined print medium, the print result corresponds to human vision As a result, the user can be convinced about the toning result, and the user can be convinced that the printing result corresponding to the chromaticity of the pseudo sample color can be objectively determined. Performing meaningful re-coloring can be reduced.

  FIG. 5 shows a configuration example of a toning support system that supports toning processing for performing color matching by blending colors of color materials that reproduce sample colors, using out-of-gamut determination information according to an embodiment of the present invention. It is a block diagram. 5, the toning support system 1 includes a reproduction color information acquisition unit 11, a determination information distribution unit 12, an in-gamut determination information generation unit 13, an out-gamut determination information generation unit 14, a reproduction color determination unit 15, and a determination result presentation. Each of the unit 16 and the storage unit 17 is provided.

  The reproduction color information acquisition unit 11 receives information on the sample color that the user wants to reproduce from the external device (for example, spectral reflectance) and whether or not this sample color can be reproduced by the color material specified by the user (the sample color is specified). Reproduction color gamut information on whether or not it is included in a reproducible color gamut depending on the color composition of the color material to be reproduced. Here, the external device is, for example, DIC COLORCLOUD (registered trademark) of DIC Graphics Co., Ltd. having all the reproduction color data (reproducible color gamut data) that can be reproduced by printing for each type of color material. ) Server (color cloud server).

  When the reproduction color gamut information indicates that the sample color is within the color gamut, the determination information distribution unit 12 outputs an in-gamut determination information generation instruction for the sample color to the intra-gamut determination information generation unit 13. On the other hand, when the reproduction color gamut information indicates that the sample color is out of the color gamut, the determination information distribution unit 12 outputs an out-of-gamut determination information generation instruction for the sample color to the out-of-gamut determination information generation unit 14. .

  When the generation instruction is supplied from the determination information distribution unit 12, the in-gamut determination information generation unit 13 reads sample color information from the reproduction color information acquisition unit 11. Then, the in-gamut determination information generation unit 13 reads the color gamut data of the color material specified by the user from the color cloud server. The in-gamut determination information generation unit 13 refers to the determination information data table stored in the storage unit 17 and reads each of the hue angle range Hw, the lightness / saturation angle range LCw, and the saturation allowable width.

  FIG. 6 is a diagram illustrating a configuration example of the determination information data table written and stored in advance in the storage unit 17. In FIG. 6, each record is provided with columns of a hue angle range Hw, a lightness / saturation angle range LCw, and other allowable range items corresponding to the color material identification information. The color material identification information is identification information that identifies the type of color material. The hue angle range Hw is an angle range that is determined in advance as a range of hue angles that are viewed in the same manner as the hue at the hue angle H. The lightness / saturation angle range LCw is an angle range that is determined in advance as a range of lightness / saturation angles that can be viewed in the same manner as the tint at the lightness / saturation angle LC. The other allowable range item indicates the allowable range of other parameters including the saturation allowable range described above.

  Returning to FIG. 1, the in-gamut determination information generation unit 13 refers to the determination information data table, the hue angle range Hw, the lightness / saturation angle range LCw, and the chroma corresponding to the color material identification information of the color material specified by the user. Each of the degree tolerance widths is read, and in-gamut determination information is generated as an allowable range three-dimensional area used to determine whether or not the toned reproduction color is appropriate.

When a generation instruction is supplied from the determination information distribution unit 12, the out-of-gamut determination information generation unit 14 reads sample color information from the reproduction color information acquisition unit 11. Then, the out-of-gamut determination information generation unit 14 reads the color gamut data of the color material specified by the user from the color cloud server. Further, the out-of-gamut determination information generation unit 14 reads each of the hue angle range Hw and the lightness / saturation angle range LCw with reference to the determination information data table stored in the storage unit 17.
Then, the out-of-gamut determination information generation unit 14 generates out-of-gamut determination information as an allowable range plane region used for determining whether or not the toned reproduction color is appropriate.

The reproduction color determination unit 15 generates a Cxf file from the sample color information (sample color spectral reflectance), and transmits it to the external CCM server together with the color material identification information of the color material specified by the user. Then, the reproduction color determination unit 15 inputs the color combination and the color mixture ratio obtained by the external CCM server.
Thus, the user creates a blended color material by blending the color materials based on the combination of the color blends of the color materials and the blend ratio of the colors. Then, the user prints the created blended color material on a predetermined print medium, measures the spectral reflectance of the printed reproduction color, and inputs it to the toning support system 1 using predetermined input means.

Further, the reproduction color determination unit 15 uses the chromaticity obtained from the input spectral reflectance as chromaticity coordinates in the L ^* a ^* b ^* coordinate system, and evaluates the chromaticity coordinates of the reproduction color.
At this time, when the gamut of the sample color is included in the color gamut of the color material, the reproduction color determination unit 15 determines whether the chromaticity of the reproduction color is included in the allowable range defined in the in-gamut determination information. On the other hand, when the chromaticity of the sample color is not included in the color gamut of the color material, it is determined whether or not the chromaticity of the reproduced color is included in an allowable range defined in the out-of-gamut determination information.

The determination result presentation unit 16 displays a result of determination as to whether or not the chromaticity of the reproduction color determined by the reproduction color determination unit 15 is within the allowable range.
FIG. 7 is a diagram of a display screen (display screen of a display unit (not shown)) showing the correspondence between the chromaticity of the reproduction color presented by the determination result presentation unit 16 and the allowable range. FIG. 7 shows the relationship between the allowable range plane region 200 in the out-of-gamut determination information and the chromaticity coordinates of the reproduced color.
In FIG. 7, an allowable range plane region 200 is formed based on the chromaticity coordinates 500 of the sample color and the color gamut of the color material specified by the user.

FIG. 7A is a diagram of a display screen that displays a determination result as to whether or not the chromaticity coordinates 300 of the reproduced color are included in the range indicated by the hue angle range Hw. In the hue angle range Hw, the color in the allowable range area 201 in the allowable range plane area 200 is different from the color in the area outside the allowable range area 201 in the allowable range plane area 200.
In FIG. 7A, the determination result presentation unit 16 displays a point indicating the chromaticity coordinate 300 in green when the chromaticity coordinate 300 is included in the allowable range area 201 in the allowable range plane area 200. When not included in the allowable range area 201, a point indicating the chromaticity coordinates 300 is displayed in red, and whether or not it is included in the allowable range area 201 is visually displayed in a different color.
Here, when the chromaticity coordinates 300 are not included in the allowable range area 201, the determination result presentation unit 16 displays the allowable range in the hue angle range Hw and the chromaticity coordinates 300 on the display screen of FIG. The difference from the coordinates of the region 201 (difference between the coordinates of the a ^* axis and the b ^* axis) may be displayed numerically.

FIG. 7B is a diagram of a display screen that displays a determination result as to whether or not the chromaticity coordinates 300 of the reproduced color are included in the range indicated by the lightness / saturation angle range LCw. As in FIG. 7A, in the lightness / saturation angle range LCw, the color in the allowable range area 201 in the allowable range plane area 200 is different from the color in the area outside the allowable range area 201 in the allowable range plane area 200. .
In FIG. 7B, when the chromaticity coordinate 300 is included in the allowable range area 201 in the allowable range plane area 200, the determination result presentation unit 16 displays a point indicating the chromaticity coordinate 300 in green. When not included in the allowable range area 201, a point indicating the chromaticity coordinates 300 is displayed in red, and whether or not it is included in the allowable range area 201 is visually displayed in a different color.
Here, when the chromaticity coordinates 300 are not included in the allowable range area 201, the determination result presentation unit 16 displays the chromaticity coordinates 300 in the lightness / saturation angle range LCw on the display screen of FIG. The difference from the coordinates of the allowable range area 201 (the difference between the coordinates of the L ^* axis and the C ^* axis) may be displayed numerically.

  FIG. 8 is a flowchart showing an operation example of processing of toning of reproduced colors corresponding to sample colors by the toning support system according to the present embodiment. Hereinafter, the toning of the reproduced color corresponding to the sample color by the toning support system according to the present embodiment will be described with reference to FIGS. 5 and 8.

Step S101:
The reproduction color information acquisition unit 11 stores information on the sample color that the user desires to reproduce the color and the color material specified by the user used to reproduce the sample color, in a predetermined external device or input means ( Input from a not-shown keyboard, for example.

Step S102:
The reproduction color information acquisition unit 11 has a color gamut capable of reproducing the supplied sample color information (spectral reflectance) and the specified color material type information for each color material. A color gamut server (for example, a DIC COLORCLOUD (registered trademark) server) is accessed, and information on whether or not the sample color can be reproduced by the color material specified by the user is acquired. Here, the color gamut server determines whether or not the sample color is included in the color gamut of the input color material, and outputs the determination result as reproduction color gamut information to the toning support system 1. To do.
Thereby, the reproduction color information acquisition unit 11 inputs the reproduction color gamut information from the color gamut server.

Step S103:
The determination information distribution unit 12 determines whether the chromaticity of the sample color is included in the color gamut of the color material based on the reproduction color gamut information.
At this time, when the chromaticity of the sample color is included in the gamut of the color material, the determination information distribution unit 12 proceeds with the process to step S104, while the chromaticity of the sample color falls within the gamut of the color material. If not included, the process proceeds to step S105.

Step S104:
The in-gamut determination information generation unit 13 reads sample color information and color material type information designated by the user from the reproduction color information acquisition unit 11.
Further, the in-gamut determination information generation unit 13 refers to the determination information data table in the storage unit 17, and from the record of the color material of the type specified by the user, the hue angle range Hw, the lightness / saturation angle range LCw, and the chroma Read each of the tolerance range width.
Then, as already described, the in-gamut determination information generation unit 13 includes the in-gamut corresponding to the spectral reflectance of the sample color, the hue angle range Hw, the lightness / saturation angle range LCw, and the saturation allowable range width. Generate judgment information.

Step S105:
The out-of-gamut determination information generation unit 14 reads sample color information and color material type information designated by the user from the reproduction color information acquisition unit 11.
Further, the out-of-gamut determination information generation unit 14 refers to the determination information data table in the storage unit 17 and reads each of the hue angle range Hw and the lightness / saturation angle range LCw from the record of the color material specified by the user. .
Then, the out-of-gamut determination information generation unit 14 generates out-of-gamut determination information corresponding to the spectral reflectance of the sample color, the hue angle range Hw, and the lightness / saturation angle range LCw as described above.

Step S106:
The reproduction color determination unit 15 generates a Cxf file from the type of the color material and the spectral reflectance of the sample color reproduced by the color material, and transmits the Cxf file to the CCM server which is an external device. Request the estimation of the combination of the color combinations of the materials and the color mixture ratio.
Then, the reproduction color determination unit 15 inputs the combination of the color material colors and the color mixture ratio from the CCM server as a result of the computer color matching.

Step S107:
The reproduction color determination unit 15 displays the combination of the colors of the color materials and the color mixture ratio on the display screen, and presents them to the operator who performs the color matching (hereinafter simply referred to as the operator).
The operator creates a blended color material by blending the color materials used for the combination based on the combination of the color blends of the color materials displayed on the display screen and the blend ratio of the colors.
Then, the operator prints the prepared mixed color material on a predetermined print medium, and measures the spectral reflectance of the reproduced color of the printing result using a spectral reflectance meter or the like.

Step S108:
The operator inputs the measured spectral reflectance of the reproduced color to the toning support system 1 from the input means, and the lightness L and hue H via the chromaticity coordinates in the L ^* a ^* b ^* coordinate system. And the chromaticity composed of the coordinate values of Saturation C and the coordinate values of the LCH coordinate system.
Thereby, the reproduction color determination unit 15 determines whether or not the chromaticity of the reproduction color is included in the allowable range indicated in the out-of-gamut determination information when the chromaticity of the sample color is outside the color gamut of the color material. Judgment is made.
In addition, when the chromaticity of the sample color is within the color gamut of the sample color, the reproduction color determination unit 15 determines whether the chromaticity of the reproduction color is included within the allowable range indicated in the in-gamut determination information. Make a decision.
At this time, if the chromaticity of the reproduced color is included in the allowable range, the reproduced color determination unit 15 advances the processing to step S109. On the other hand, when the chromaticity of the reproduction color is not included in the allowable range, the reproduction color determination unit 15 advances the process to step S110.

Step S109:
In the display screen shown in FIGS. 7A and 7B, the determination result presentation unit 16 uses the LCH coordinate system shown in FIG. 2 when the chromaticity coordinates 300 of the reproduction color are included in the allowable range. The chromaticity coordinates 300 of the reproduced color are displayed in, for example, green. Then, the determination result presentation unit 16 displays the current color material type, the combination of the color material colors, and the color mixture ratio, so that a reproduction color in which the sample color is reproduced without any problem is obtained. Is notified to the user.

Step S110:
When the reproduction color chromaticity coordinates 300 are not included in the allowable range on the display screen shown in FIGS. 7A and 7B, the determination result presentation unit 16 determines the reproduction color chromaticity coordinates 300 as follows. The color is displayed in a color different from that included in the allowable range in the LCH coordinate system, for example, red. Then, the determination result presentation unit 16 displays the type of the current color material, the combination of the color material colors, and the color mixture ratio, and displays the difference between the chromaticity of the reproduced color and the coordinates of the allowable range. In order to display on the screen and prompt the user to perform the color matching, the user is notified.

Step S111:
In the display screen shown in FIGS. 7A and 7B, the toning person displays the correspondence between the chromaticity coordinates 300 of the reproduction color and the allowable range in the LCH coordinate system shown in FIG. 2 and the color of the reproduction color. Check each of the degrees and the difference in tolerance coordinates. Further, the color adjuster performs a color adjustment operation of changing the color mixing ratio of the combined color materials in the color mixture material.

Step S112:
The toning person determines the color mixture ratio from the correspondence between the chromaticity coordinates 300 of the reproduction color in the LCH coordinate system and the allowable range, and the difference between the chromaticity of the reproduction color and the coordinates of the allowable range in the LCH coordinate system. A guideline for changing the degree is estimated from own experience values based on the current values of brightness L, hue H, and saturation C (coordinate values).
Then, the color adjuster inputs the color mixture combination of the color materials and the color material color mixture ratio after adjustment to the color matching support system 1 from the input unit.
Thereby, the reproduction color determination unit 15 inputs the combination of colors and the color mixture ratio of the color material after adjustment by the adjuster, and the process proceeds to step S107.

As described above, according to the present embodiment, by using the out-of-gamut determination information in the toning support system 1, the sample colors presented by the user can be reproduced in the color gamut reproducible in the color material specified by the user. When the chromaticity goes out of the gamut, the chromaticity of the pseudo sample color that is closest in saturation to the sample color desired by the user is obtained, and when the chromaticity of this pseudo sample color is reproduced, it is recognized by multiple people in the same way It can be seen that a reproduction color that reproduces the pseudo sample color is obtained within an allowable range that is visually recognized as a color tone, and the toning process can be performed efficiently.
Further, according to the present embodiment, it is possible to visually indicate to the user that the color is reproduced as a pseudo sample color within the allowable range indicated by the out-of-gamut determination information, and the most sample is within the color gamut of the color material. It is possible to objectively indicate to the user that the toning process of the coloring material for obtaining the chromaticity of the pseudo sample color having a color close to the color has been appropriately performed.

Next, remote toning using the toning support system 1 according to the present embodiment will be described. This remote toning application is used, for example, when a printing factory where no toning person is stationed requests a toning management center in which the toning person is resident to request toning to reproduce the sample color. Is possible.
FIG. 9 is a diagram illustrating a configuration example for performing remote color matching using the color matching support system according to the present embodiment. In FIG. 9, each of the toning support system 1, the color cloud server 2, the CCM server 3, and the work terminal 4 is connected as a configuration for transmitting and receiving data via a network 5 (including a communication line such as the Internet). ing.

The color cloud server 2 has, as a database, all reproduced color data (reproducible color gamut data) that can be reproduced by printing for each type of color material.
Based on the Cxf file supplied from the toning support system 1, the CCM server 3 obtains a color material combination and a color mixture ratio for reproducing a sample color with a predetermined type of color material.
The work terminal 4 is, for example, a personal computer or a server arranged in a remote factory.
The remote place indicates a position away from a predetermined place where a toning person who performs toning using the toning support system 1 is resident. For example, when the toning support system 1 is arranged in a toning center in Tokyo and the work terminal 4 is arranged in a printing factory in Kyushu, remote toning is performed.

FIG. 10 is a sequence diagram for explaining an example of remote toning processing performed using the toning support system 1 of the present embodiment.
Process F1:
A person in charge at a remote printing factory (hereinafter, simply a person in charge) transmits toning information to the toning support system 1 through the work terminal 4 of the printing factory. This toning information includes the spectral reflectance of the sample color, information on the scheduled printing medium that is the printing medium scheduled for printing (scheduled printing medium type, spectral reflectance of the scheduled printing medium), and information on the type of color material. including.

Process F2:
The toning support system 1 creates a Cxf file based on the spectral reflectance of each of the sample color and the scheduled print medium.
At this time, although not illustrated, the toning support system 1 provides the color cloud server 2 with a color gamut in which the chromaticity of the sample color can be reproduced by the color material of the type specified by the user (hereinafter referred to as ink). Is included, and the allowable range described above (out-of-gamut determination information or in-gamut determination information) is created.

Process F3:
Then, the toning support system 1 transmits the Cxf file to the CCM server 3 and requests the calculation of the color combination and the color mixture ratio by the ink of the type specified by the user.

Process F4:
The CCM server 3 uses the Cxf file supplied from the toning support system 1, that is, according to the spectral reflectance of the sample color and the spectral reflectance of the planned print medium, Is calculated.

Process F5:
The CCM server 3 transmits each of the calculated ink color combination and the color mixture ratio to the toning support system 1.

Process F6:
The toning support system 1 inputs from the CCM server 3 the blending information composed of the combination of the ink colors and the blending ratio of the colors for reproducing the sample color, and displays the blending information on the display screen. .
Thus, the toning person blends ink colors based on the displayed blending information to create blended ink, and uses the blended ink for toning that is the same type of print medium as the planned print medium. Print on (toned print medium).
The toning person measures the spectral reflectance of the reproduced color of the blended ink printed on the toning printing medium, and inputs the measured spectral reflectance to the toning support system 1.

Process F7:
The toning support system 1 converts the spectral reflectance of the reproduced color into chromaticity coordinates in the L ^* a ^* b ^* coordinate system, and has already obtained an allowable range based on the color gamut according to the chromaticity of the sample color and the type of ink ( It is determined whether it is included in out-of-gamut determination information or in-gamut determination information.
Then, when the chromaticity of the reproduced color is within the allowable range, the toning person does not need to perform the toning again, and the toning for reproducing the sample color has been performed, so the process F8 is performed.
On the other hand, if the chromaticity of the reproduced color is not within the allowable range, the toning person does not sufficiently perform the toning for reproducing the sample color and needs to perform the toning again. I do.

Process F8:
The toning support system 1 includes the spectral reflectance of the reproduced color obtained from the toning print medium, the combination and combination ratio of each color of the ink specified by the user, and the spectral reflectance of the toning print medium. Ink toning information is transmitted to the work terminal 4.

Process F9:
The work terminal 4 displays the ink toning information supplied from the toning support system 1 on the display screen.
The person in charge at the printing factory creates a blended ink with the type of ink specified by the user based on the blending combination of the colors of the ink and the blending ratio of the colors based on the ink toning information.
At this time, the person in charge confirms the spectral reflectance of the production print medium used for production and the spectral reflectance of the toning print medium, and confirms that the spectral reflectance is not significantly different. At this time, if it is greatly different, the production print medium and the toning print medium may be of different types, so the person in charge requests the toning center to perform the toning again (re-toning), The process from the process F1 is repeated.

  Then, the person in charge prints the prepared blended ink on the production print medium, measures the spectral reflectance of the printed reproduction color, and confirms that it is equivalent to the spectral reflectance of the reproduction color. At this time, as described above, the chromaticity of the reproduced color printed on the production print medium is the in-gamut determination information and the out-of-gamut determination information generated in accordance with the chromaticity of the reproduced color corresponding to the chromaticity of the sample color. The determination result indicating whether or not it is included in the allowable range is shown to the user. Here, the person in charge accesses the toning support system 1, transmits the spectral reflectance of the reproduced color printed on the production print medium, and confirms the determination result.

Process F10:
The toning support system 1 displays the chromaticity coordinates 300 of the reproduced color in red on the display screens shown in FIGS. 7A and 7B, and the hue angle range Hw and lightness saturation in the color gamut of the ink. It is shown to the toning person that the angle is not within the allowable range set by the angular range LCw.
The toning person displays the positional relationship between the chromaticity coordinates 300 and the allowable range of the reproduced color in the a ^* b ^* coordinate system (hue), and the positional relationship between the chromaticity coordinates 300 and the allowable range in the L ^* C ^* coordinate system. Toning is performed to adjust the mixing ratio of the ink colors based on the difference between the chromaticity coordinates 300 displayed on the screen and the coordinates of the allowable range.

Process F11:
Then, the toning person inputs the blending ratio of the ink color as a result of the toning into the toning support system 1 again, and repeats the process from the process F6.

Conventionally, time has been required for transportation from a remote location to the sample color toning center, toning processing of the mixed ink corresponding to the sample color, transportation of the toned ink to the remote location, etc. With the remote toning apparatus configuration using the toning support system 1 according to the above, the toning corresponding to the sample color can be performed only by sending the toning information and the ink toning information (returning).
For this reason, it is possible to reduce the time required to present the reproduced color to the user after the user requests it.

In addition, since there are veteran toning personnel resident at the toning center, even if there are no toning veterans in remote locations, the toning processing required in real time can be performed, so a small number of veteran toning people Even in this case, it is possible to efficiently perform a color material toning process for obtaining a reproduction color corresponding to the sample color requested by the user.
Further, by using the toning support system 1, the optimum reproduction color that can be reproduced in the color gamut designated by the user on the display screen comparing the fact that the toning has been performed with the in-gamut determination information or the out-of-gamut determination information. This can be easily shown to the user, and requests for re-coloring multiple times can be suppressed.

In addition, the toning support system 1 is not toned by the toning person, and the hue (a) in the chromaticity of the allowable range and the chromaticity of the reproduction color based on the experience of the toning person (especially the experienced toning person). ^* Coordinate, b ^* coordinate) difference, brightness and saturation differences, and the positional relationship between the chromaticity of the allowable range and the chromaticity of the reproduced color A database may be created as a toning database, and the reproduction color determining unit 15 may perform toning by referring to the toning database.

That is, the reproduction color determination unit 15 refers to the toning database, and compares the difference in hue (a ^* coordinate, b ^* coordinate), the difference in lightness and saturation, the chromaticity in the allowable range, and the reproduction color. An adjustment amount for adjusting the mixing ratio of the ink color corresponding to the positional relationship of the chromaticity is read out, and the toning process is performed.
With this configuration, a colorant for obtaining a reproduction color equivalent to an experienced color adjuster, even if it is an inexperienced color adjuster, in the same manner as an experienced color adjuster, or even if there is no color adjuster It is possible to perform toning by changing the mixing ratio of the colors.

  Further, the program for realizing the function of the color matching support system 1 in FIG. 5 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed. You may perform the process which supports the toning process in the production | generation of the reproduction color corresponding to a color. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Toning support system 2 ... Color cloud server 3 ... CCM server 4 ... Work terminal 5 ... Network 11 ... Reproduction color information acquisition part 12 ... Determination information distribution part 13 ... In-gamut determination information generation part 14 ... Out-of-gamut determination information Generation unit 15: Reproduction color determination unit 16 ... Determination result presentation unit 17 ... Storage unit Hw ... Hue angle range LCw ... Lightness / saturation angle range

Claims (7)

A reproduction color information acquisition unit that obtains reproduction color gamut information of whether the chromaticity of the sample color is within or outside the color gamut of the color material used for adjustment of the reproduction color,
When the reproduction color gamut information indicates that the chromaticity of the sample color is within the color gamut, an in-gamut determination information generation unit for obtaining in-gamut determination information for determining the chromaticity of the reproduction color corresponding to the color gamut When,
When the reproduction color gamut information indicates that the chromaticity of the sample color is out of the color gamut, the out-of-gamut determination information generation unit for obtaining out-of-gamut determination information for determining the chromaticity of the reproduction color corresponding to the out-of-gamut When,
If it is within the color gamut, whether or not the chromaticity of the reproduced color is included in an allowable range indicated by the in-gamut determination information, and if it is out of the color gamut, the chromaticity of the reproduced color is determined to be out of the color gamut. A reproduction color determination unit that determines whether or not it is included in the allowable range indicated by the information;
A determination result presentation unit that presents a determination result of whether or not the chromaticity of the reproduced color is included in the allowable range,
Each of the in-gamut determination information and the out-of-gamut determination information is within the allowable range, in the L ^* a ^* b ^* coordinate system of the color space, the origin of the L ^* a ^* b ^* coordinate system and the color of the sample color A hue angle range indicating a range of hue angles formed by a projection line obtained by projecting a straight line connecting degrees to an a ^* b ^* plane, and an L ^* axis and an LC (lightness saturation) plane with the projection line as an axis. A toning support system comprising an allowable plane defined by an LC angle range indicating a range of an LC angle formed by a projection line and the straight line. The out-of-gamut determination information generation unit
2. The toning support system according to claim 1, wherein the allowable plane including an intersection of a color gamut of the color material and the straight line is formed by the hue angle range and the LC angle range. Each of the hue angle range and the LC angle range includes an L ^* axis indicating lightness in the L ^* a ^* b ^* coordinate system, and a coordinate point of the origin and the a ^* value and b ^* value of the sample color. Set in the LCH color system composed of the C axis indicating the saturation as the projection line to be connected and the hue angle H formed by the a ^* axis and the C axis counterclockwise on the a ^* b ^* plane. The toning support system according to claim 1, wherein the toning support system is provided. The determination result presentation unit
In the color gamut of the color material, chromaticity determined by CCM (Computer Color Matching) according to the mixing ratio of each ink type is presented together with the allowable range of the in-gamut determination information or the out-of-gamut determination information. The toning support system according to any one of claims 1 to 3. 5. The hue angle range and the LC angle range are determined as ranges perceived as similar colors in an experiment by visual recognition by a plurality of color adjusters. The toning support system according to claim 1. The reproduction color information acquisition unit obtains reproduction color gamut information for whether the chromaticity of the sample color is within or outside the color gamut of the color material used for adjustment of the reproduction color, and
In-gamut determination information generation unit, when the reproduction color gamut information indicates that the chromaticity of the sample color is in the color gamut, the in-gamut determination information for determining the chromaticity of the reproduction color corresponding to the color gamut In-gamut determination information generation process for obtaining
Out-of-gamut determination information generation unit, when the reproduction color gamut information indicates that the chromaticity of the sample color is out of the color gamut, out-of-gamut determination information for determining the chromaticity of the reproduction color corresponding to the out-of-gamut Out-of-gamut determination information generation process for
When the reproduction color determination unit is within the color gamut, whether or not the chromaticity of the reproduction color is included in an allowable range indicated by the in-gamut determination information, and when it is out of the color gamut, the color of the reproduction color Reproduction color determination process for determining whether or not the degree is included in the allowable range indicated by the out-of-gamut determination information;
A determination result presentation unit that presents a determination result indicating whether or not the chromaticity of the reproduced color is included in the allowable range; and
Each of the in-gamut determination information and the out-of-gamut determination information is within the allowable range, in the L ^* a ^* b ^* coordinate system of the color space, the origin of the L ^* a ^* b ^* coordinate system and the color of the sample color A hue angle range indicating a range of hue angles formed by a projection line obtained by projecting a straight line connecting degrees to the a ^* b ^* plane, and the projection line in an LC (lightness saturation) plane composed of the L ^* axis and the projection line And a tolerable plane defined by an LC angle range indicating an LC angle range formed by the straight line. On the computer,
Reproduction color information obtaining means for obtaining reproduction color gamut information of whether the chromaticity of the sample color is within or outside the color gamut of the color material used for adjustment of the reproduction color,
When the reproduction color gamut information indicates that the chromaticity of the sample color is within the color gamut, the in-gamut determination information generation means for obtaining in-gamut determination information for determining the chromaticity of the reproduction color corresponding to the color gamut ,
When the reproduction color gamut information indicates that the chromaticity of the sample color is out of the color gamut, out-of-gamut determination information generation means for obtaining out-of-gamut determination information for determining the chromaticity of the reproduction color corresponding to the out-of-gamut ,
If it is within the color gamut, whether or not the chromaticity of the reproduced color is included in an allowable range indicated by the in-gamut determination information, and if it is out of the color gamut, the chromaticity of the reproduced color is determined to be out of the color gamut. Reproducible color determination means for determining whether or not it is included in the allowable range indicated by the information;
A program that is executed as a determination result presentation unit that presents a determination result of whether or not the chromaticity of the reproduced color is included in the allowable range;
Each of the color gamut determination information and the color gamut decision information, connecting the L ^* a ^* b ^* coordinate system of the color space, and the L ^* a ^* b ^* coordinate system origin to the sample color chromaticity linear A hue angle range indicating a range of hue angles formed by a projection line projected onto the a ^* b ^* plane, and the projection line and the straight line on the LC (lightness saturation) plane composed of the L ^* axis and the projection line. The allowable range including the allowable plane defined from the LC angle range indicating the LC angle range formed,
program.

Images