Patent ID: 7667869

Claim:
An image processing device for, when overprinting a multicolor original with a plurality of color inks, converting multivalued pixel values of a color space corresponding to an image of the multicolor original into multivalued pixel values of a color space corresponding to the color inks, the image processing device comprising: a color space coordinate conversion unit configured to, with reference to a color conversion LUT which stores relationship between the multivalued pixel values of the color space corresponding to the multicolor original and the multivalued pixel values of the color space corresponding to the color inks, convert the multivalued pixel values of the color space corresponding to the multicolor original into the multivalued pixel values of the color space corresponding to the color inks; and a correction unit configured to correct at least one of the multivalued pixel values of the color space corresponding to the color inks, the multivalued pixel values being converted based on the color conversion LUT, and the multivalued pixel values of the color space corresponding to the color inks, the multivalued pixel values being stored in the color conversion LUT, according to the color inks and an overprint sequence of the color inks, wherein, when the multivalued pixel values of the color space corresponding to a later-printed color ink are equal to or more than a predetermined threshold value, the correction unit calculates a correction factor from the threshold value and the multivalued pixel values of the color space corresponding to the later-printed color ink according to the overprint sequence, and by using the calculated correction factor, corrects the multivalued pixel values of the color space corresponding to a previously-printed color ink.