Patent ID: 7466450

Claim:
An image processing system comprising: output means for allowing an output device to output patch-data items of plural multi-order colors; acquiring means for acquiring color values, in an absolute color space, of the patch-data items output from the output device; reference-value calculating means for calculating reference values by converting the plural multi-order colors based on a first color conversion table containing correspondence between a color space based on the output device and the absolute color space; difference calculating means for calculating differences between the color values acquired by the acquiring means and the reference values, which correspond thereto and weighting the calculated differences with the differences between lattice point data, in the absolute color space, extracted from the first color conversion table and the calculated reference values; and correcting means for correcting, based on the differences calculated by the difference calculating means, a second color conversion table containing correspondence between the absolute color space and an output color space based on the output device.