Patent ID: 7221482

Claim:
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 having 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, wherein, in said color transformation lookup table, said relationship is obtained through a process that comprises a step in which, in a certain color region in a color space, the hue angle of the second color image data is determined by rotating the hue angle of the corresponding first color image data; and wherein said relationship between color gamuts of the first image processing device and the second image processing device is defined through a process comprising: a step where hue angle of the color gamut of the first image processing device is rotated by a predetermined angle in a certain color region in the device-independent color space; and a step where the rotated gamut after the hue-angle rotation is compressed to fall within the color gamut of the second image processing device.