Abstract: When performing color conversion using a color conversion table which has signal values of an output color space corresponding to grid points dividing an input color space into a plurality of unit cubes, a quadrant to which an input signal belongs is determined, in a chromaticity plane perpendicular to a lightness axis of the input color space. A unit cube to which the input signal belongs is detected in the plurality of unit cubes. The detected unit cube is divided into a plurality of polyhedrons for interpolation operation by a segmentation method corresponding to the determined quadrant. The divide of the detected unit cube is performed along a direction of a diagonal line, which passes through an origin of the chromaticity plane, in a part of the plurality of unit cubes in accordance with the segmentation method.

Abstract: When performing color conversion using a color conversion table which has signal values of an output color space corresponding to grid points dividing an input color space into a plurality of unit cubes, a quadrant to which an input signal belongs is determined, in a chromaticity plane perpendicular to a lightness axis of the input color space. A unit cube to which the input signal belongs is detected in the plurality of unit cubes. The detected unit cube is divided into a plurality of polyhedrons for interpolation operation by a segmentation method corresponding to the determined quadrant. The divide of the detected unit cube is performed along a direction of a diagonal line, which passes through an origin of the chromaticity plane, in a part of the plurality of unit cubes in accordance with the segmentation method.

Abstract: The profile of a reference color space is acquired, and the acquired profile is converted into the profile of a uniform color appearance space which is a color space different from the reference color space. An evaluation value of color in the profile of the uniform color appearance space is calculated, and the profile of the uniform color appearance space is corrected based on the calculated evaluation value. The corrected profile is inversely converted into the profile of the reference color space.

Abstract: Data which represents a color space is input, a dataset which represents visual uniformity in each of a plurality of color areas is acquired, and control points which indicate a control region including the plurality of color areas corresponding to the dataset are set on the color space. Then, using the control points and dataset, the color space is corrected to be shrunk.

Abstract: The profile of a reference color space is acquired, and the acquired profile is converted into the profile of a uniform color appearance space which is a color space different from the reference color space. An evaluation value of color in the profile of the uniform color appearance space is calculated, and the profile of the uniform color appearance space is corrected based on the calculated evaluation value. The corrected profile is inversely converted into the profile of the reference color space.

Abstract: The profile of a reference color space is acquired, and the acquired profile is converted into the profile of a uniform color appearance space which is a color space different from the reference color space. An evaluation value of color in the profile of the uniform color appearance space is calculated, and the profile of the uniform color appearance space is corrected based on the calculated evaluation value. The corrected profile is inversely converted into the profile of the reference color space.

Abstract: A table, which records a relationship between image data of patches included in a chart, which are acquired by capturing the chart under a plurality of types of illumination light having different characteristics, and the characteristics, is held for each image capturing device capturing the chart, and for each chart print condition. Specifying information of an image capturing device used to estimate characteristics of illumination light and a print condition of a chart used to estimate the characteristics of the illumination light are input as estimation conditions. Image data of a chart captured by the image capturing device under the illumination light is input. The characteristics of the illumination light are estimated based on a table corresponding to the estimation conditions and the input image data.

Abstract: A color processing apparatus includes a device characteristic acquisition unit configured to acquire a monitor device characteristic, a viewing condition acquisition unit configured to acquire a viewing condition of a display screen, a correction unit configured to correct the monitor device characteristic based on the viewing condition of the display screen, and a color conversion unit configured to perform color conversion based on the viewing condition of the display screen and the corrected monitor device characteristic.

Abstract: Tristimulus values of a partial adaptation white point of a virtual object and those of a partial adaptation white point of a display device are calculated from tristimulus values of a white point of the display device, and those of a white point of the virtual object, which are decided according to the area of a light source central reflection region. Then, RGB values for respective pixel positions on a projection plane are settled based on these partial adaptation white points, and a rendering image configured by pixels having the RGB values is formed on the projection plane.

Abstract: Data which represents a color space is input, a dataset which represents visual uniformity in each of a plurality of color areas is acquired, and control points which indicate a control region including the plurality of color areas corresponding to the dataset are set on the color space. Then, using the control points and dataset, the color space is corrected to be shrunk.

Abstract: A table, which records a relationship between image data of patches included in a chart, which are acquired by capturing the chart under a plurality of types of illumination light having different characteristics, and the characteristics, is held for each image capturing device capturing the chart, and for each chart print condition. Specifying information of an image capturing device used to estimate characteristics of illumination light and a print condition of a chart used to estimate the characteristics of the illumination light are input as estimation conditions. Image data of a chart captured by the image capturing device under the illumination light is input. The characteristics of the illumination light are estimated based on a table corresponding to the estimation conditions and the input image data.

Abstract: An image processing apparatus includes an acquisition unit configured to acquire a lightness distribution of an image which input image data represents, a generation unit configured to generate a gloss control signal for controlling a glossiness of the image, depending on the lightness distribution, and a conversion unit configured to convert the input image data into output image data, based on the gloss control signal.

Abstract: A color processing apparatus includes a calculation unit configured to calculate a correction value from reference color information in an input color gamut and reference color information in a reference color gamut, a correction unit configured to correct reference target color information in the reference color gamut based on the correction value to calculate target color information, and a color conversion unit configured to convert an input color in the input color gamut into an output color within an output color gamut by using the target color information.

Abstract: In order to match the color appearance of the display image on a monitor to that of a print image, the white point of the monitor and that of the viewing light upon viewing the print image are obtained, and a white point upon viewing the display image on the monitor and that upon viewing the print image are calculated using the white point of the monitor, that of the viewing light, and a reference white point. An input color is corrected using the calculated white points. At this time, as the reference white point, a white color which the human visual system perceives as white is used.

Abstract: Implementation of color matching with a high accuracy between a device of luminous type and a device of non-luminous type is demanded. Hence, a combination of the device type of a source device and the device type of a destination device is discriminated. If a device of luminous type and a device of non-luminous type are combined, colorimetric values of the device of non-luminous type measured by a contact colorimeter into those of a non-contact colorimeter, and color conversion in accordance with a predetermined color matching method is performed using colorimetric values of the device of luminous type measured by the contact colorimeter and the transformed colorimetric values of the device of non-luminous type.

Abstract: A color processing method includes setting a reference color as a reference for mapping, setting a distribution range of mapped points based on a color value of the set reference color, distributing a mapped point corresponding to an input color into the distribution range, and mapping the input color into an output color gamut using the mapped point.

Abstract: A color processing apparatus includes a device characteristic acquisition unit configured to acquire a monitor device characteristic, a viewing condition acquisition unit configured to acquire a viewing condition of a display screen, a correction unit configured to correct the monitor device characteristic based on the viewing condition of the display screen, and a color conversion unit configured to perform color conversion based on the viewing condition of the display screen and the corrected monitor device characteristic.

Abstract: A color processing apparatus includes a calculation unit configured to calculate a correction value from reference color information in an input color gamut and reference color information in a reference color gamut, a correction unit configured to correct reference target color information in the reference color gamut based on the correction value to calculate target color information, and a color conversion unit configured to convert an input color in the input color gamut into an output color within an output color gamut by using the target color information.

Abstract: In order to match the color appearance of the display image on a monitor to that of a print image, the white point of the monitor and that of the viewing light upon viewing the print image are obtained, and a white point upon viewing the display image on the monitor and that upon viewing the print image are calculated using the white point of the monitor, that of the viewing light, and a reference white point. An input color is corrected using the calculated white points. At this time, as the reference white point, a white color which the human visual system perceives as white is used.

Abstract: Implementation of color matching with a high accuracy between a device of luminous type and a device of non-luminous type is demanded. Hence, a combination of the device type of a source device and the device type of a destination device is discriminated. If a device of luminous type and a device of non-luminous type are combined, calorimetric values of the device of non-luminous type measured by a contact colorimeter into those of a non-contact calorimeter, and color conversion in accordance with a predetermined color matching method is performed using calorimetric values of the device of luminous type measured by the contact colorimeter and the transformed calorimetric values of the device of non-luminous type.