Patent ID: 6799912
Filing Date: 2004-10-05
Classification: G03G

Abstract:
A method of printing comprising:identifying pixel locations on a print output medium that are requested to be printed with only black; electrophotographically printing black at the identified pixel locations; and electrophotographically printing a non-black color only at each of those identified pixel locations that (A) have an associated black half-tone threshold level that is darker than a predetermined non-white threshold level, and (B) 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.