Converting black to composite black in digital printing

Details Converting black to composite black in digital printing Converting black to composite black in digital printing

2007-07-02

2010-12-07

Lee, Thomas D (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S518000, C358S523000, C358S529000

Reexamination Certificate

active

07847975

ABSTRACT:
A method of converting black to composite/process black in a digital color print engine. A lightness adjustment is employed for converting input image (O, O, O, Kin) to Koand initial values of Co, Mo, Yoare set equal to Koand then converted to C1, M1, Y1, K1by GCR strategy. Values of Cout, Mout, Yout, Koutare determined by Gray Balance Adjustment for values of C1, M1, Y1, K1and inputted to the color print engine. The user may disable the conversion to composite black and print black ink/tones if desired. The user may also input different parameters for Lightness Adjustment, Gray Component Replacement and Gray Balance Adjustment.

REFERENCES:
patent: 4590515 (1986-05-01), Wellendorf
patent: 5181068 (1993-01-01), Morikawa
patent: 5386305 (1995-01-01), Usami
patent: 5528386 (1996-06-01), Rolleston et al.
patent: 5710824 (1998-01-01), Mongeon
patent: 7064860 (2006-06-01), Balasubramanian et al.
patent: 2004/0042019 (2004-03-01), Moro

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