Patent US 6,744,544

To provide a color image forming and correcting method and apparatus for reducing the difference in color reproducibility in the image system or image device and achieving proper color reproduction.ConstitutionAn information value specifying a color gamut in coordinate system of the perceptual color space is entered and associated with an information value specifying a pre-set other color gamut defined by a pre-set other color gamut by fuzzy processing. By such association, the color gamut in the perceptual color space is converted into a pre-set color gamut in the coordinate system of the perceptual color space. The information value specifying the converted color gamut in the coordinate system of the perceptual color space is outputted.