Patent ID: 7813001
Filing Date: 2010-10-12
Classification: H04N

Abstract:
1. A color image processing method, converting a first color signal including C, M, Y signals and a spot color signal to a second color signal including C, M, Y signals and a spot color signal, comprising: determining a device independent color signal on a color coordinate in a color system from the C, M, Y and the spot color signals of the first color signal; determining a spot color signal of the second color signal such that the spot color signal of the second color signal has a minimum or substantially minimum color difference from the spot color signal of the first color signal; and determining the C, M and Y signals of the second color signal such that the second color signal colorimetrically equal to the device independent color signal from the device independent color signal and the spot color signal of the second color signal; wherein the spot color signal in the first color signal and the second color signal is at least one selected from red, green and blue.