Replacing true black with process black

Details Replacing true black with process black Replacing true black with process black

1998-02-05

2000-09-12

Mancusco, Joseph

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 115, 358 116, 358518, 358523, 347 43, B41B 1500, G03F 308, B41J 221

Patent

active

061185485

ABSTRACT:
Rapid processing of color print data so as to replace true black ink with process black ink, so as to minimize bleeding between colored regions of a printed document and black regions thereof. To replace black with process black in a raster line, multiple pixels are examined simultaneously in groups so as to determine whether the group contains at least one colored pixel, with the exact location of the colored pixel being obtained thereafter. The last color pixel in the raster line is obtained by inspecting each Nth subsequent pixel, thereby skipping N between inspections, until a first black pixel is encountered, and thereafter backtracking to obtain the first color pixel. Thereafter, all black pixels within a window marked by the first and last color pixels, plus a margin, are replaced with process black.

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M.L. Schmit, "Pentium.TM. Processor Optimization Tools", Academic Press, Inc., 1995, pp. 103-192.

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