Patent ID: 7027195

Claim:
A color image processing apparatus having an under color removal processing unit for carrying out under color removal processing on an input color signal, comprising: an input color chip making unit for selecting a color signal as a selected color signal from an input color space as a target of under color removal, and printing out a color chip of the selected color signal as an input color chip; an output color chip making unit for printing out a color chip of a obtained color signal as an output color chip for each parameter by subjecting the selected color signal to the under color removal processing carried out in the under color removal processing unit with two or more parameters which are different from one another; and a parameter determining unit for selecting, from the parameters, a parameter which provides the minimum difference between the input color chip and the output color chip; wherein the under color removal processing unit carries out the under color removal processing on the input color signal by using the parameter selected by said parameter determining unit.