US Patent 7456998 Image processing apparatus, image processing method, and computer program

According to the invention, a value of a high density color material as a decomposition target is decomposed into a combination of the high density color material value and a low density color material value by using a value obtained by color-measuring a patch in which the high density color material and the low density color material are combined, a color measurement value of a patch formed by using the value of the high density color material as a decomposition target is compared with a color measurement value of a patch formed by using the values of the high density color material and the low density color material formed by decomposing, and the values of the high density color material and the low density color material formed by decomposing are corrected on the basis of the comparison result. A color separation table in which a color drift of 5 or more colors corresponding to each color does not occur can be formed.