Patent ID: 7697781

Claim:
An image processing method for optimizing a color processing parameter used in color processing, the method comprising: using a processor to perform: an acquisition step, of acquiring data by sensing a color chart in which a plurality of color patches are included; a converting step, of converting acquired data of each color patch, acquired in said acquisition step, into converted color data based on the color processing parameter; a target color data input step, of inputting target color data corresponding to the color data of each color patch; and an optimizing step, of optimizing the color processing parameter so as to diminish a color difference between the converted color data corresponding to the target color data and the target color data, wherein said optimizing step includes: a first optimizing sub-step, of optimizing the color processing parameter based on first target color data, of the target color data, being within a prescribed color gamut and first converted color data, of the converted color data, corresponding to the first target color data; and a second optimizing sub-step, of optimizing the color processing parameter based on the first target color data and the first converted color data, and second target color data, of the target color data, which is out of the prescribed color gamut, and second converted color data, of the converted color data, corresponding to the second target color data, wherein hue difference between the second target color data and the second converted color data corresponding to the second target color data is smaller than a predetermined value.