Patent ID: 8218206

Claim:
A color processing method of converting color in a first gamut to color in a second gamut, comprising the steps of: setting control points on a boundary of the second gamut in a low-lightness region, wherein lightness of the low-lightness region is less than lightness of a maximum saturation point of the second gamut; setting a colorimetrical matching region in the second gamut, wherein color in the colorimetrical matching region is colorimetrically matched in a color conversion; generating a third gamut by transforming the second gamut to move the control points onto a line or curve which connects a black point of the second gamut with one of the control points so as to expand a recessed portion of the second gamut; transforming, in addition to the transformation in the generating step, the colorimetrical matching region in the second gamut and a region corresponding to the colorimetrical matching region in the first gamut, wherein a transformation amount of the region corresponding to the colorimetrical matching region in the first gamut applies to the colorimetrical matching region in the second gamut; performing colorimetrically approximate color reproduction on the color in the first gamut and inside the colorimetrical matching region; perceptually mapping the color in the first gamut and outside the colorimetrical matching region into the third gamut; and converting the color in the first gamut into the color in the second gamut based on the result of the reproduction and mapping.