Selective enhancement of black

Details Selective enhancement of black Selective enhancement of black

2005-03-29

2005-03-29

Nguyen, Lamson (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

C358S534000

Reexamination Certificate

active

06871928

ABSTRACT:
A technique for selective enhancement of black including printing a non-black color at pixel locations identified by a candidate pixel array and which correspond to marked pixels in a predetermined pixel pattern, wherein the candidate pixel array comprises a plurality of N-pixel candidate tiles respectively associated with N-pixel image tiles of a black half-toned bit map, wherein an N-pixel candidate tile includes marked pixels only if the associated N-pixel image tile comprises a portion of a half-toned uniform region and the number of marked pixels in the associated N-pixel image tile is at least a predetermined percentage of N, and wherein the number of marked pixels in some of the N-pixel candidate tiles is less than the number of marked pixels of the associated N-pixel image tile.

REFERENCES:
patent: 5784049 (1998-07-01), Hall
patent: 6122407 (2000-09-01), Peters
patent: 6290330 (2001-09-01), Torpey et al.

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