Hierarchical color error diffusion in a CMYKRGB domain

Details Hierarchical color error diffusion in a CMYKRGB domain Hierarchical color error diffusion in a CMYKRGB domain

2011-05-31

2011-05-31

Haskins, Twyler L (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003030, C358S003060, C358S003200, C358S003220

Reexamination Certificate

active

07952764

ABSTRACT:
What is provided are a novel system, method, and computer program product for hierarchical (telescopic) color error diffusion which effectively controls the dot distribution for both primary and secondary dot formation which covers the class of error diffusion that follow telescopic dot firing constraint principles. In one example embodiment, an input CMYK ink coverage is received. The input CMYK ink coverage is transformed into a CMYKRGB domain using a CMYK to CMYKRGB conversion. A weighted error value can be added to each color component of the CMYKRGB domain. The color components of the CMYKRGB domain are hierarchically grouped into a plurality of subgroups based on relative dot visibility. More visible subgroups are half-toned earlier to achieve maximum uniform dot distribution. Dots of specific color channels within subgroups are fired based on thresholding and a set of decision rules provided herein.

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