Patent ID: 7839536

Claim:
An image processing apparatus comprising: a color-conversion-data holding unit configured to store color conversion data describing at least a relation between an image signal and color information represented by color materials; a color converting unit configured to convert the image signal into the color information in accordance with the color conversion data; and a color-conversion-data rewriting unit configured to rewrite the color conversion data stored in the color-conversion-data holding unit, wherein the color-conversion-data holding unit copies, before rewriting of the color conversion data, the color conversion data to an area different from an area in which the color conversion data is rewritten and holds, as the color conversion data, color conversion data for chromatic colors indicating a relation between the image signal and color information represented by color materials and color conversion data for achromatic colors indicating a relation between the image signal and color information of a specific color, and the color-conversion-data rewriting unit rewrites one or both of the color conversion data for chromatic colors and the color conversion data for achromatic colors and copies one or both of the color conversion data for chromatic colors and the color conversion data for achromatic colors to the area different from the area in which the data is rewritten.