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AssigneeSeiko Epson Corporation
InventorsSatoshi Yamazaki, Makoto Fujino
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If there is considerable difference in volume between the color gamut of one image processing device and the color gamut of the other image processing device, high-rate compression occurs and changes chroma to a great degree, resulting in color unbalancing. For example, if an image of the leaves of a plant including shadows is transferred from an image input device to an image output device and reproduced, the shadows discolor and look dark brown. According to the invention, the color gamut of the first image processing device is rotated by a predetermined hue angle and compressed to fall within the color gamut of the second image processing device and color values in the former gamut are mapped to those in the later gamut. By color transformation based on the thus defined mapping, color transformation is executed. Thereby, second color image data determined by rotating the hue angle of first color image data can be obtained. In circumstances where a plurality of color gamuts are available on an image processing device, mapping is defined adaptively for each gamut, thereby finer adjustment can be performed. Consequently, color gamut mapping of the first and second image processing devices in a device-independent color space, wherein there is great difference between their color gamut volumes, can be corrected so that color unbalancing can be prevented even for different forms of color gamut that is the target gamut of color output.
A medium recording a color transformation lookup table to be referenced for transforming first color image data used on a first image processing device into second color image data used on a second image processing device and have a first set of values and a second set of values that represent the relationship between color gamuts of the first image processing device and the second image processing device,
An apparatus for printing based on a color transformation lookup table to be referenced for transforming first color image data used on a first image processing device into second color image data used on a second image processing device and have a first set of values and a second set of values that represent the relationship between color gamuts of the first image processing device and the second image processing device,
A method for printing based on a color transformation lookup table to be referenced for transforming first color image data used on a first image processing device into second color image data used on a second image processing device and have a first set of values and a second set of values that represent the relationship between color gamuts of the first image processing device and the second image processing device,
A medium recording a computer-executable printing program for printing based on a color transformation lookup table to be referenced for transforming first color image data used on a first image processing device into second color image data used on a second image processing device and have a first set of values and a second set of values that represent the relationship between color gamuts of the first image processing device and the second image processing device,
An apparatus for transforming first color image data used on a first image processing device into second color image data used on a second image processing device, based on a color transformation lookup table to have a first set of values and a second set of values that represent the relationship between color gamuts of the first image processing device and the second image processing device,
A medium recording a color transformation program for transforming RGB data into CMY data, wherein
Dependencies are inferred from the claim text.