WO2013133335A1 - 色再現方法、色再現システム、色再現プログラムおよび色再現装置 - Google Patents
色再現方法、色再現システム、色再現プログラムおよび色再現装置 Download PDFInfo
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- WO2013133335A1 WO2013133335A1 PCT/JP2013/056175 JP2013056175W WO2013133335A1 WO 2013133335 A1 WO2013133335 A1 WO 2013133335A1 JP 2013056175 W JP2013056175 W JP 2013056175W WO 2013133335 A1 WO2013133335 A1 WO 2013133335A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
- G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6058—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0606—Manual adjustment
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/06—Colour space transformation
Definitions
- the present invention relates to a color reproduction method, a color reproduction system, a color reproduction program, and a color reproduction device, and particularly to a color image in which a color gamut to be reproduced is assumed, and to maximize the color gamut in the color image reproduction system or color image device.
- the present invention relates to a color reproduction method, a color reproduction system, a color reproduction program, and a color reproduction apparatus that can reproduce a color image having a gradation characteristic that does not fail when used in the above.
- Patent Document 1 An example of a related color reproduction method is described in Patent Document 1.
- Patent Document 1 provides a method of providing a color conversion table creation program that can easily adjust clipping and compression in accordance with user preferences. Specifically, a color conversion table is created for mapping colors in the first color gamut, which is the color gamut of the first color device, into the second color gamut, which is the color gamut of the second color device.
- the color gamut information reading step for reading the information on the first color gamut and the information on the second color gamut
- the color conversion amount input step for inputting the color conversion amount in the color gamut
- Mapping in which mapping is performed by changing a mixing ratio between mapping by clipping and mapping by compression in accordance with the input color conversion amount when mapping based on the information on the first color gamut and the information on the second color gamut And causing the computer to execute the steps.
- Patent Document 1 The method of Patent Document 1 described in the background art employs clipping for colors outside the color gamut, so that the color gradation in the original color space cannot be maintained. Specifically, a plurality of colors that are reproduced as different colors in the color gamut of the first color device are reproduced with one color on the surface of the color gamut in the second color device. Images reproduced on the second color device are not necessarily optimal.
- the technique of Patent Document 1 has a problem that the gradation in the image that is correctly reproduced by the first color device cannot be correctly reproduced by the second color device. In the second color device, for any input color, hue, saturation, and lightness cannot be corrected within the range of the color gamut of the second color device, so that color reproduction that matches the user's preference is realized. There was also a problem that it was difficult.
- the present invention has been invented in view of the above problems, and its object is to provide a color image system having a color gamut different from the color gamut that is supposed to be reproduced.
- a color reproduction method, a color reproduction system, and a color reproduction program that maintain the gradation of the color image by effectively using the color reproduction range of the color image system or the color image device. It is to provide.
- a first color gamut on the input side and a second color gamut on the output side are input, and color adaptation based on a reference white color in the first color gamut and the second color gamut.
- Applying a first color correction considering the above and a second color correction for matching basic colors in the first color reproduction area and the second color reproduction area to the first color reproduction area A color existing in a color outside the second color gamut with respect to the first color gamut to which the first color correction and the second color correction are applied is the surface or inside of the second color gamut.
- 3 is a color reproduction method for generating color conversion information for applying the third color correction for correcting the first color to convert the first color reproduction area to the second color reproduction area.
- the present invention provides means for reading a first color gamut on the input side and a second color gamut on the output side, and color adaptation based on reference white in the first color gamut and the second color gamut.
- a first color correction unit that performs a first color correction in consideration of the first color correction, and a first color that performs a second color correction that matches the basic colors in the first color reproduction area and the second color reproduction area
- a color existing in a color outside the second color gamut is changed to a second color gamut with respect to the first color gamut to which the correcting means and the first color correction and the second color correction are applied.
- the present invention provides a process for reading a first color gamut on the input side and a second color gamut on the output side, and color adaptation based on reference white in the first color gamut and the second color gamut.
- a first color correction process for performing a first color correction considering the first color correction, and a first color for performing a second color correction for matching the basic colors in the first color reproduction area and the second color reproduction area A color existing in a color outside the second color gamut is changed to a second color gamut with respect to the first color gamut to which the correction process, the first color correction, and the second color correction are applied.
- Conversion information for causing the computer to execute a third color correction process for performing a third color correction for correcting the color of the surface or the inside of the first color gamut, and converting the first color gamut into the second color gamut.
- the present invention can realize color reproduction with gradation maintained in a color image system or color image apparatus having a color reproduction range different from the color reproduction range assumed for a color image.
- FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention.
- FIG. 2 is a flowchart showing the operation of the first embodiment.
- FIG. 3 is a diagram showing a specific example in which the first color reproduction area and the second color reproduction area are displayed in the color space.
- FIG. 4 is a diagram showing the concept of color correction based on the basic color of the second color correction means.
- FIG. 5 is a diagram showing a specific example of color correction based on the basic color of the second color correction means.
- FIG. 6 is a diagram illustrating a state in which the second color gamut is divided by a triangular pyramid having a measurement point as a vertex.
- FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention.
- FIG. 2 is a flowchart showing the operation of the first embodiment.
- FIG. 3 is a diagram showing a specific example in which the first color reproduction area and the second color reproduction area are displayed in the color space.
- FIG. 4 is
- FIG. 7 is a diagram showing the inside / outside determination result of the second color gamut of the color in the first color gamut.
- FIG. 8 is a diagram showing an example of a user interface for color gamut correction used by the third color correction means.
- FIG. 9 is a block diagram showing the configuration of the second exemplary embodiment of the present invention.
- FIG. 10 is a flowchart showing the operation of the second embodiment.
- FIG. 11 is a diagram showing an example of a user interface for color correction used in the fourth color correction means.
- FIG. 12 is a block diagram showing the configuration of the third exemplary embodiment of the present invention.
- FIG. 13 is a diagram showing specific color correction by the user interface according to the third embodiment of the present invention.
- FIG. 14 is a block diagram showing an embodiment of the present invention.
- FIG. 1 is a block diagram of a color reproduction system 100 according to the first embodiment.
- the color reproduction system 100 receives a first color reproduction gamut and a second color reproduction gamut, and inputs from the first color reproduction gamut to the second color reproduction gamut. Outputs color conversion information.
- the color reproduction system 100 includes a color gamut input unit 1, a color gamut display unit 2, a first color correction unit 3, a second color correction unit 4, and a third color correction unit 5.
- the color gamut correction interface means 6 is constituted.
- the color gamut input means 1 reads a first color gamut that is a color gamut on the input side and a second color gamut that is a color gamut on the output side.
- the color gamut display means 2 displays the first color gamut and the second color gamut in the color space.
- uniform color space CIELAB, HSV (H: hue, S: saturation, V: lightness) or the like is used as the color space.
- the first color correction unit 3 applies color correction in consideration of human color adaptation to the first color gamut when the reference white colors of the first color gamut and the second color gamut are different. To do.
- the second color correction unit 4 is configured so that the basic color in the first color reproduction range to which the color correction by the first color correction unit 3 is applied matches the corresponding basic color in the second color reproduction range. Apply color correction.
- the third color correction unit 5 still has an externally located color in the second color reproduction range in the first color reproduction range to which the color reproduction range conversion by the second color correction unit 4 is applied. In this case, the color correction is performed so that the color becomes the color of the surface or the inside of the second color gamut.
- the color gamut correction interface means 6 selects a color to be corrected from the first color gamut displayed on the color gamut display means 2 when applying the color correction in the third color correction means 5. And providing the user with parameters for correcting the selected color.
- the color reproduction system 100 collects a series of correction results from the first color gamut to the second color gamut. Is output as color conversion information to the color gamut.
- the overall operation of the present embodiment includes a color reproduction gamut reading step (S1), a color reproduction region color space display step (S2), and a color correction step considering color adaptation ( S3), color correction based on the basic color (S4), and color gamut correction by the user interface (S5) are performed in this order.
- S1 color reproduction gamut reading step
- S2 color reproduction region color space display step
- S3 color correction step considering color adaptation
- S4 color correction based on the basic color
- S5 color gamut correction by the user interface
- the color reproduction gamut reading step (S1) information on the first color reproduction gamut of the input color space and the second color reproduction gamut serving as the output color space is read.
- these color gamuts are provided with correspondence relationships between device colors representing colors such as RGB and CMYK and tristimulus values XYZ.
- the conversion matrix and mutual gamma characteristics of RGB and tristimulus values XYZ such as sRGB may be defined, or the color reproduced by a color image device may be actually measured.
- the color gamut input means 1 operates as in S1 above.
- the read first and second color gamuts are displayed in the color space.
- a color space such as tristimulus value XYZ, uniform color space CIELAB, HSV (H: hue, S: saturation, V: lightness) can be used.
- FIG. 3 shows an example in which the first color gamut and the second color gamut are displayed in the uniform color space CIELAB.
- the color gamut expressed by the dotted line is the first color gamut and the color gamut expressed by the solid line is the second color gamut.
- the color gamut display means 2 operates as in S2.
- color correction step (S3) considering chromatic adaptation, when the reference white color in the first color gamut is different from the reference white color in the second color gamut, color correction considering human color adaptation is performed. Applies to 1 color gamut. When the reference whites of the two color gamuts are different, or when the two reference whites are the same and the observation environment is different, humans may not perceive the same color even if the tristimulus values XYZ are matched.
- Chromatic adaptation conversion is a color correction process for compensating for such a phenomenon related to human color appearance, and various methods such as von Kries, CIECAM02, and Japanese Patent Laid-Open No. 2000-113174 have been proposed. In this embodiment, these chromatic adaptation conversions can be applied.
- the first color correction means 3 operates as in S3 above.
- FIG. 4 is a diagram showing the concept of color correction based on the basic color.
- This figure shows the state when two color gamuts whose color devices are RGB are displayed as xy chromaticity diagrams. It can be seen that the coordinate positions of R, G, and B, which are the basic colors in these two color gamuts, are different.
- the basic color in the first color gamut on the input side may be different in hue, so it is reproduced with the basic color in the second color gamut on the output side, and as it approaches an achromatic color. Reproduction is performed with a color close to the original color in the first color gamut on the input side.
- the color correction based on the basic color has an advantage that the color reproduction area on the output side can be effectively utilized.
- FIG. 5 shows the color correction for the space spanned by Y and G in the first color gamut as a two-dimensional plane a * b * .
- Y and G are Y and G in the first color gamut on the input side to which the first color correction is applied, and Yp and Gp are Y and G in the second color gamut.
- a correction vector V1 when mapping from Y (L y , a y , b y ) to Yp (L py , a py , b py ) is expressed by the following equation.
- Correction vector V1 (L py , a py , b py ) ⁇ (L y , a y , b y ) (1)
- correction vectors are calculated for the remaining basic colors (R, G, B, C, M).
- the correction target color is far from white as shown in FIG.
- Color correction is applied to increase the correction intensity as the value increases.
- a correction vector Vx to be applied to the point X in the Lab space in the first color gamut on the input side to which the first color correction is applied is calculated.
- An example of the second color correction will be described with reference to the example of FIG.
- the point X exists in the color space spanned by Y and G.
- the correction vector Vx applied to X is calculated using the correction vectors V1 and V2 calculated for Y and G.
- the hue H and saturation C of Y, G, and point X in the first color gamut on the input side to which the first color correction is applied are calculated.
- the hue angle of Y and G is dH
- the hue angle of Y and X is dH1.
- the color device value RGB in the second color gamut corresponding to L * a * b * in the uniform color space CIELAB to which the second color correction is applied is calculated.
- the correspondence between the tristimulus values XYZ and the color device values is defined as a standard color space such as sRGB or AdobeRGB in the second color reproduction range, it can be easily calculated by following a specified mathematical formula.
- the correspondence relationship between the tristimulus value XYZ and the color device value is not defined by the mathematical expression in the second color gamut, based on the correspondence relationship between the color device value RGB and the tristimulus value XYZ obtained by measurement. Calculate the color device value. A method for calculating the color device value in this case will be described.
- a triangular pyramid that satisfies the conditional expressions (4) to (6) may be searched from among all the triangular pyramids that constitute the second color gamut.
- a plurality of triangular pyramids satisfy the conditional expressions (4) to (6). In that case, any one of them A triangular pyramid may be selected.
- the color device value C in the second color gamut corresponding to the point Y is calculated.
- the color device values corresponding to the apexes A0, A1, A2, and A3 of the triangular pyramid including the point Y are C0, C1, C2, and C3, the color device value C is expressed by the following expression.
- the coefficients a, b, and c are the same coefficients as those in Expression 4.
- the second color correction means 4 operates as in S4 above.
- the color gamut correction step (S5) by the user interface will be described.
- the color correction step (S3) in consideration of chromatic adaptation and the color correction step (S4) based on the basic color there are still colors outside the second color gamut. Further, it is necessary to correct the color to the surface of the second color gamut or the internal color.
- such a color is corrected using the first and second color gamuts displayed in the color space display step (S2) of the color gamut and a user interface for correcting the color gamut.
- a color outside the second color gamut is selected.
- the inside / outside determination of the second color gamut can be easily determined by whether or not there is a triangular pyramid constituting the second color gamut that satisfies the conditional expressions (4) to (6).
- the color constituting the first color gamut determined to be outside the second color gamut is represented by that point.
- the color to be displayed is displayed so that the user can easily select a color outside the color gamut by changing the size of the point.
- a user interface for determining parameters in the color gamut correction as shown in FIG. 8 is presented to determine the parameters.
- LCH calculated from (L * , a * , b * ) of the selected color is displayed.
- L represents lightness and is L * .
- C represents saturation and H represents hue, which is calculated by the following equation.
- the hue H is expressed in radians, but when expressed as an angle H ′, it is further calculated as follows.
- each component of the selected LCH is corrected while being controlled by a slide bar so that the color becomes the surface color or the internal color of the second color gamut.
- the color to be corrected becomes the surface of the second color gamut or the internal color during correction, the color and size representing the point are linked as shown in FIG. Change.
- the color reversal phenomenon can be avoided by applying the correction amount for the selected color to the adjacent colors in such a manner that the correction amount is gradually weakened and interlocking the correction. Further, by simultaneously selecting and correcting a plurality of colors existing around the color to be corrected, the work efficiency in this step is also improved.
- the color gamut correction step (S5) by the user interface ends.
- the third color correction means 5 operates as in S5 described above, and the color gamut correction interface means 6 is realized by a user interface shown in FIG. 8, for example.
- color correction by the user interface In color correction by the user interface, clipping is not applied to colors outside the color gamut on the output side, and color inversion does not occur, so that color reproduction with maintained gradation can be realized. Furthermore, since it is based on color correction by the user, color reproduction suitable for the user's preference can be realized.
- color conversion information from the first color gamut to the second color gamut is generated.
- the color conversion information from the first color gamut to the second color gamut is, for example, a color conversion table that records the correspondence between the color device values in the input color space and the color device values in the output color space. Can be output.
- the color reproduction gamut on the output side is configured by the configuration of the color correction step based on the basic color and the color gamut correction step by the user interface Can be used effectively, and color reproduction with gradation can be maintained. Furthermore, color reproduction that matches the user's preference can be realized.
- color reproduction with a maintained gradation can be realized in a color image system or color image apparatus having a color reproduction range different from the color reproduction range assumed for a color image. This is because the color gamut of the color image system or the color image device is effectively used, and in particular, clipping is not applied to colors outside the color gamut in the process of color reproduction.
- a color reproduction system 200 that is the best mode for carrying out the second invention of the present invention has a fourth color correction means 7 and a color correction interface means 8 added to the color reproduction system 100. It becomes the composition.
- the fourth color correction unit 7 applies the first to third color corrections to the first color gamut so as to reproduce the color corrected so that it can be reproduced in the second color gamut. Providing color correction that matches user preferences.
- the color correction interface unit 8 selects a color to be corrected when applying the color correction in the fourth color correction unit 7 and provides the user with a parameter for correcting the selected color.
- the overall operation of the present embodiment is as follows: a color gamut reading step (S1), a color gamut color space display step (S2), and a color correction step considering color adaptation ( S3), color correction based on basic colors (S4), color gamut correction by user interface (S5), and specific color correction by user interface (S6) are performed in this order.
- a color gamut reading step (S1) a color gamut color space display step (S2)
- a color correction step considering color adaptation ( S3), color correction based on basic colors (S4), color gamut correction by user interface (S5), and specific color correction by user interface (S6) are performed in this order.
- S3 color adaptation
- S4 color correction based on basic colors
- S5 color gamut correction by user interface
- S6 specific color correction by user interface
- the first to third color corrections are applied to the first color gamut so as to be reproduced in the second color gamut.
- color correction is applied to meet the user's preference.
- FIG. 11 shows an example of a user interface for color correction used in S6.
- the left side of FIG. 11 shows the first and second color gamuts displayed by the color gamut display means 2, and by applying the first to third color corrections to the first color gamut.
- An arbitrary color in the first color gamut represents a state that can be reproduced in the second color gamut.
- the color constituting the first color gamut displayed on the color gamut display means 2 is selected by operating the computer with a mouse. From the L * a * b * value of the selected color, the hue, saturation, and brightness of that color are calculated and plotted on the graph represented by hue-saturation on the color correction interface on the right side of FIG.
- the lightness of the graph expressed by hue-saturation is expressed by the same lightness as the selected color.
- the hue and saturation of the selected color can be corrected by moving the plot points on the graph expressed by this hue-saturation.
- the brightness of the selected color can be corrected by changing the brightness adjustment bar.
- the correction result in the color correction interface is reflected in the first color gamut.
- only the selected color may be reflected or may be reflected in the surrounding colors of the selected color.
- color correction without any sense of incongruity can be realized by adjusting the correction amount based on the color difference, hue difference, saturation difference, or brightness difference from the selected color. .
- the fourth color correction means 7 operates as in S6 above, and the color correction interface means 8 provides an interface for color correction performed by the fourth color correction means 7 as shown in FIG. .
- the specific color correction step configured by the user interface can realize color reproduction that more suits the user's preference when reproducing the color in the color reproduction area on the input side in the color reproduction area on the output side.
- a color reproduction system 300 has a configuration in which evaluation image display means 9 is added to the color reproduction system 200.
- the evaluation image display means 9 can select a color to be corrected from the presented evaluation image and can confirm the effect of the color correction as an image when performing color correction to meet the user's preference. Provide a more convenient color correction function.
- the basic operation is the same as that shown in the flowchart of FIG. 10, except that the method of selecting a color to be corrected in the specific color correction (S6) by the user interface is different.
- the newly added evaluation image display means 9 is used. Will be described.
- the evaluation image display means 9 displays the evaluation image with a color that reflects the color conversion information from the first color reproduction area to the second color reproduction area, and has the second color reproduction area.
- the imaging device Present to the imaging device.
- various images such as a person image, a landscape image, and a CG image can be prepared and selected.
- the user selects the color to be corrected from the presented evaluation image.
- the color correction for the selected color is as described in the specific color correction (S6) by the user interface.
- the effect of this embodiment is that the color correction can be selected from the presented evaluation image and the effect of the color correction can be confirmed as an image when color correction is performed so as to meet the user's preference. Therefore, more convenient color correction can be realized.
- the color reproduction systems 100 to 300 in the first to third embodiments described above can also be realized as a program that runs on a computer. Further, as shown in FIG. 14, the color reproduction device 400 can be implemented.
- the color reproduction device 400 receives the first color reproduction range and the second color reproduction range, and outputs color conversion information from the first color reproduction range to the second color reproduction range.
- Area input means 1 color reproduction area display means 2, first color correction means 3, second color correction means 4, third color correction means 5 and color reproduction area correction interface means 6, color reproduction area storage memory 10 It is composed of
- Each of the color gamut input means 1, color gamut display means 2, first color correction means 3, second color correction means 4, third color correction means 5 and color gamut correction interface means 6 includes: The same operation as that described in the color reproduction system 100 is performed.
- the color reproduction area storage memory 10 is a memory for storing the first color reproduction area and the second color reproduction area by the color reproduction area input means 1.
- the first color reproduction area stored in the color reproduction area storage memory 10 reflects the correction results of the first color correction means 3, the second color correction means 4, and the third color correction means 5 each time. .
- the first color gamut on the input side and the second color gamut on the output side are input, A first color correction considering color adaptation based on a reference white color in the first color gamut and the second color gamut, and a basic color in the first color gamut and the second color gamut.
- Applying a second color correction to match the first color reproduction gamut A color existing in a color outside the second color gamut with respect to the first color gamut to which the first color correction and the second color correction are applied is the surface or inside of the second color gamut.
- Apply a third color correction to correct the color A color reproduction method for generating color conversion information for converting the first color gamut into the second color gamut.
- a color gamut obtained by applying the first color correction and the second color correction to the first color gamut and the second color gamut are colored.
- Supplementary Note 1 to Supplementary Note 4 for performing a fourth color correction for changing a parameter of a color selected by a user interface among colors constituting the first color gamut constituting the color conversion information.
- the color reproduction method according to any one of the above.
- ⁇ Supplementary Note 7> means for reading the first color gamut on the input side and the second color gamut on the output side; First color correction means for performing a first color correction considering color adaptation based on a reference white color in the first color gamut and the second color gamut; First color correction means for performing a second color correction for matching basic colors in the first color reproduction range and the second color reproduction range; A color existing in a color outside the second color gamut with respect to the first color gamut to which the first color correction and the second color correction are applied is the surface or inside of the second color gamut. And third color correction means for performing a third color correction for correcting the color of A color reproduction system that generates color conversion information for converting the first color gamut into the second color gamut.
- the third color correction unit includes a color reproduction range obtained by applying the first color correction and the second color correction to the first color reproduction range, and the second color reproduction range. Any one of appendix 7 to appendix 9 that displays in a color space, selects a color that exists in a color outside the second color gamut by a user interface, and corrects the color to the surface or the internal color of the second color gamut The described color reproduction system.
- Supplementary Note 7 to Supplementary Note 10 having fourth color correction means for changing a parameter of a color selected by a user interface among colors constituting the first color gamut constituting the color conversion information.
- a color reproduction system according to any one of the above.
- ⁇ Supplementary Note 16> a color reproduction range obtained by applying the first color correction and the second color correction to the first color reproduction range, and the second color reproduction range.
- Appendices 13 to 15 which are processes for displaying in a color space, selecting a color existing in a color outside the second color gamut by the user interface, and correcting the color to the surface or the internal color of the second color gamut The program according to any one.
- Supplementary Note 13 to Supplementary Note 16 including a fourth color correction process for changing a parameter of a color selected by a user interface among colors constituting the first color gamut constituting the color conversion information.
- ⁇ Supplementary Note 20> Input the first color gamut on the input side and the second color gamut on the output side, A first color correction in consideration of color adaptation based on a reference white color in the first color reproduction range and the second color reproduction range; and a basic color in the first color reproduction range as the second color reproduction. Generate a second color correction to convert to the base color in the region, Applying the first color correction and the second color correction to the first color gamut to generate a corrected color gamut, and the corrected color reproduction existing outside the second color gamut Generate a third color correction that performs color correction on the colors in the gamut, A color reproduction method for generating conversion information for converting the first color gamut into the second color gamut.
- Supplementary Note 20 or Supplementary Note 21 for selecting the same basic color or color device value in the first color gamut as the desired color in the second color gamut in the first color correction.
- the color correction information for the color to be corrected is the color correction information obtained by the first color correction for the two basic colors sandwiching the color to be corrected.
- an evaluation image is presented to a user on a color image device having the second color gamut, and the first color correction and the second color correction are performed.
- the color reproduction method according to any one of appendix 20 to appendix 23, wherein a user can confirm the effect of the third color correction with the evaluation image.
- a color to be corrected by the third color correction is selected from the colors of the evaluation image presented on the color image device having the second color gamut.
- the present invention can be applied to a color image reproduction system having a different color gamut or a color reproduction system, a color reproduction program, and a color reproduction apparatus between color image apparatuses. Further, the present invention can be applied to a function for creating a color conversion table between color image reproduction systems or color image apparatuses having different color gamuts.
- color reproduction area input means 2 color reproduction area display means 3 first color correction means 4 second color correction means 5 third color correction means 6 color reproduction area correction interface means 7 fourth color correction means 8 color correction Interface means 9
- Evaluation image display means 10 Color reproduction area storage memory 100 Color reproduction system 200 Color reproduction system 300 Color reproduction system 400 Color reproduction device
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Abstract
Description
本発明の第1の実施の形態について、図面を参照して詳細に説明する。
補正ベクトルV1=(Lpy, apy, bpy)-(Ly, ay, by) (1)
同様にして、残りの基本色(R, G, B, C, M)についても補正ベクトルを算出する。
次に、色相成分に寄与する補正ベクトルVhを算出する。
Vh = (1-dH1/dH)・V1 + (dH1/dH)・V2 (2)
そして、補正ベクトルVhに彩度成分の寄与を反映させて、点Xに作用する補正ベクトルVxを算出する。
Vx=Cx/C・Vh (3)
均等色空間CIELABにおける点Xに補正ベクトルVxを適用した結果が、基本色以外の色に対する第2の色補正の結果になる。
は、CIELAB色空間における原点からの位置ベクトルを表す。
ここで、係数a、b、cは、式4における係数と同じ係数である。
ここで、色相Hはラジアンで表現されているが、角度H’で表現する場合には、さらに以下のように計算する。
本発明の第2の実施の形態について図面を参照して詳細に説明する。
<第3の実施の形態>
本発明の第3の実施の形態について図面を参照して詳細に説明する。
前記第1の色再現域と前記第2の色再現域における基準白色に基づく色順応を考慮した第1の色補正と、前記第1の色再現域と前記第2の色再現域における基本色を一致させる第2の色補正とを、前記第1の色再現域に適用し、
前記第1の色補正と前記第2の色補正とを適用した第1の色再現域に対し、前記第2の色再現域外の色に存在する色を第2の色再現域の表面もしくは内部の色に補正する第3の色補正を適用し、
前記第1の色再現域を前記第2の色再現域に変換する色変換情報を生成する
色再現方法。
付記1に記載の色再現方法。
付記1又は付記2に記載の色再現方法。
付記1から付記3のいずれかに記載の色再現方法。
付記1から付記4のいずれかに記載の色再現方法。
付記5に記載の色再現方法。
前記第1の色再現域と前記第2の色再現域における基準白色に基づく色順応を考慮した第1の色補正を行う第1の色補正手段と、
前記第1の色再現域と前記第2の色再現域における基本色を一致させる第2の色補正を行う第1の色補正手段と、
前記第1の色補正と前記第2の色補正とを適用した第1の色再現域に対し、前記第2の色再現域外の色に存在する色を第2の色再現域の表面もしくは内部の色に補正する第3の色補正を行う第3の色補正手段と
を有し、
前記第1の色再現域を前記第2の色再現域に変換する色変換情報を生成する
色再現システム。
付記7に記載の色再現システム。
付記7又は付記8に記載の色再現システム。
付記7から付記9のいずれかに記載の色再現システム。
付記7から付記10のいずれかに記載の色再現システム。
付記11に記載の色再現システム。
前記第1の色再現域と前記第2の色再現域における基準白色に基づく色順応を考慮した第1の色補正を行う第1の色補正処理と、
前記第1の色再現域と前記第2の色再現域における基本色を一致させる第2の色補正を行う第1の色補正処理と、
前記第1の色補正と前記第2の色補正とを適用した第1の色再現域に対し、前記第2の色再現域外の色に存在する色を第2の色再現域の表面もしくは内部の色に補正する第3の色補正を行う第3の色補正処理と
をコンピュータに実行させ、
前記第1の色再現域を前記第2の色再現域に変換する色変換情報を生成する
プログラム。
付記13に記載のプログラム。
付記13又は付記14に記載のプログラム。
付記13から付記15のいずれかに記載のプログラム。
付記13から付記16のいずれかに記載のプログラム。
付記17に記載のプログラム。
前記第1の色再現域と前記第2の色再現域における基準白色に基づいて色順応を考慮した第1の色補正と、前記第1の色再現域における基本色を前記第2の色再現域における基本色に変換するための第2の色補正を生成し、
前記第1の色補正と前記第2の色補正とを前記第1の色再現域に適用して補正色再現域を生成し、前記第2の色再現域の外部に存在する前記補正色再現域における色について色補正を施す第3の色補正を生成し、
前記第1の色再現域を前記第2の色再現域に変換する変換情報を生成する
色再現方法。
前記第1の色再現域における基本色を前記第2の色再現域における所望の色に変換するための第1の色補正を生成し、
前記第1の色再現域における基本色以外の色を補正するための第2の色補正を生成し、
前記第1の色補正と前記第2の色補正とを、前記第1の色再現域に適用して補正色再現域を生成し、
前記補正色再現域における任意の色について均等色空間で色補正を施すユーザーインタフェースを伴った第3の色補正を適用し、
前記第1の色再現域の任意の色に対応する前記第2の色再現域における色への色変換情報を生成する
色再現方法。
付記20又は付記21に記載の色再現方法。
付記20から付記22のいずれかに記載の色再現方法。
付記20から付記23のいずれかに記載の色再現方法。
付記24に記載の色再現方法。
2 色再現域表示手段
3 第1の色補正手段
4 第2の色補正手段
5 第3の色補正手段
6 色再現域補正インターフェース手段
7 第4の色補正手段
8 色補正インターフェース手段
9 評価画像表示手段
10 色再現域格納メモリ
100 色再現システム
200 色再現システム
300 色再現システム
400 色再現装置
Claims (10)
- 入力側の第1の色再現域と出力側の第2の色再現域とを入力とし、
前記第1の色再現域と前記第2の色再現域における基準白色に基づく色順応を考慮した第1の色補正と、前記第1の色再現域と前記第2の色再現域における基本色を一致させる第2の色補正とを、前記第1の色再現域に適用し、
前記第1の色補正と前記第2の色補正とを適用した第1の色再現域に対し、前記第2の色再現域外の色に存在する色を第2の色再現域の表面もしくは内部の色に補正する第3の色補正を適用し、
前記第1の色再現域を前記第2の色再現域に変換する色変換情報を生成する
色再現方法。 - 前記第2の色補正は、基本色以外の色に対して、彩度が高くなるにつれて補正強度を強くする色補正である
請求項1に記載の色再現方法。 - 前記第2の色補正は、基本色以外の色に対して、前記基本色以外の色を挟む2つの基本色に対する色補正情報から色補正する
請求項1又は請求項2に記載の色再現方法。 - 前記第3の色補正は、前記第1の色再現域に前記第1の色補正と前記第2の色補正を適用した色再現域と前記第2の色再現域とを色空間に表示し、ユーザーインタフェースによって第2の色再現域外の色に存在する色を選択し、前記第2の色再現域の表面もしくは内部の色に補正する
請求項1から請求項3のいずれかに記載の色再現方法。 - 前記色変換情報を構成する前記第1の色再現域を構成する色のうち、ユーザーインタフェースによって選択された色のパラメータを変更する第4の色補正を行う
請求項1から請求項4のいずれかに記載の色再現方法。 - 前記第4の色補正において、前記第2の色再現域を有する画像装置上に提示された評価画像の色から補正する色を選択する
請求項5に記載の色再現方法。 - 入力側の第1の色再現域と出力側の第2の色再現域を読み込む手段と、
前記第1の色再現域と前記第2の色再現域における基準白色に基づく色順応を考慮した第1の色補正を行う第1の色補正手段と、
前記第1の色再現域と前記第2の色再現域における基本色を一致させる第2の色補正を行う第1の色補正手段と、
前記第1の色補正と前記第2の色補正とを適用した第1の色再現域に対し、前記第2の色再現域外の色に存在する色を第2の色再現域の表面もしくは内部の色に補正する第3の色補正を行う第3の色補正手段と
を有し、
前記第1の色再現域を前記第2の色再現域に変換する色変換情報を生成する
色再現システム。 - 前記第2の色補正手段は、基本色以外の色に対して、彩度が高くなるにつれて補正強度を強くする色補正を行う
請求項7に記載の色再現システム。 - 前記第2の色補正手段は、基本色以外の色に対して、前記基本色以外の色を挟む2つの基本色に対する色補正情報から色補正する
請求項7又は請求項8に記載の色再現システム。 - 入力側の第1の色再現域と出力側の第2の色再現域を読み込む処理と、
前記第1の色再現域と前記第2の色再現域における基準白色に基づく色順応を考慮した第1の色補正を行う第1の色補正処理と、
前記第1の色再現域と前記第2の色再現域における基本色を一致させる第2の色補正を行う第1の色補正処理と、
前記第1の色補正と前記第2の色補正とを適用した第1の色再現域に対し、前記第2の色再現域外の色に存在する色を第2の色再現域の表面もしくは内部の色に補正する第3の色補正を行う第3の色補正処理と
をコンピュータに実行させ、
前記第1の色再現域を前記第2の色再現域に変換する色変換情報を生成する
プログラム。
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