Patent ID: 6742870
Filing Date: 2004-06-01
Classification: B41J,G03G,H04N

Abstract:
A method of printing comprising:identifying pixel locations on a print output medium that are requested to be marked with only black; electrophotographically printing black at the identified pixel locations; electrophotographically printing at least one non-black color only at each of pixel locations of a subset of those identified pixel locations that correspond to on-pixels of a reference pattern of non-black color pixels having an on-pixel population of at least 20 percent and a toner transfer efficiency of less than about 20 percent, wherein each non-black color pixel of the reference pattern is of at least one non-black color, and wherein the at least one non-black color for a pixel location is defined by the at least one non-black color of a corresponding non-black color pixel of the reference pattern; whereby black is printed by itself without a non-black color at identified pixel locations other than the subset of the identified pixel locations that correspond to on-pixels of the reference pattern of non-black color pixels.