Patent ID: 7312893
Filing Date: 2007-12-25
Classification: H04N

Abstract:
1. A method for transforming device dependent color values [C1, M1, Y1, K1] of a first printing process into device dependent color values [C2, M2, Y2, K2] of a second printing process to make visual impression of colors substantially the same in both the first and second printing processes, the first printing process being characterized by a first color profile and the second printing process being characterized by a second color profile, which comprises: placing the device dependent color values of the first and second printing processes in a relationship with the device independent color values of one of a LAB color space and a XYZ color space with the first and second color profiles; determining a one-dimensional assignment function K2=f(K1) from the first and second color profiles; determining, from the first and second color profiles by multidimensional color space transformations, the color values [C2pw, M2pw, Y2pw, K2pw] describing a paper white of the first printing process in the device dependent color values of the second printing process; and transforming pure gray colors of the first printing process having device dependent color values [C1=0, M1=0, Y1=0, K1] into device dependent color values [C2pw, M2pw, Y2pw, K2pw+f(K1)] of the second printing process.