Patent ID: 6386670
Filing Date: 2002-05-14
Classification: B41J,B41M,C09D,H04N

Abstract:
The method of printing with overlayed inks of three separate colors and separate black from data defining only the separate colors comprising:printing an amount of coverage of black ink in an amount defined substantially as follows: k=kmax&af;[Î¼-Î¼sÎ¼max-Î¼s]Î³â€ƒwhere, Î³=1+&varepsilon;&it;â€ƒ&it;kmax&it;3c02+m02+y02k is said amount of coverage of black ink; &mgr;s is a predetermined amount at or larger than the amount at which minimal grain is observed; &mgr; is the minimum amount on a linear scale of the amount of coverage defined by said data of said three colors; &mgr;max is the maximum possible amount of black ink; &egr; is a constant in the range of 0.2 and 2.0; and c0, m0, y0 are the amount of coverage on a linear scale defined by said data for said three colors respectively.