Halftone dot placement for multi-color images

Details Halftone dot placement for multi-color images Halftone dot placement for multi-color images

2005-03-15

2005-03-15

Lee, Thomas D. (Department: 2722)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S534000

Reexamination Certificate

active

06867884

ABSTRACT:
A method for producing halftone dot patterns involves generation of a halftone dot pattern one color channel as a function of the halftone dot pattern generated for another color channel. Placement of dots for one color channel in view of dot placement of one or more other color channels can enhance image quality, promoting improved spacing of dots among the halftone dot patterns generated for the overprinted color channels. Dot placement for a color channel may depend on the number of dots placed for color channels that precede it in the halftoning process. With improved dot spacing in view of inter-channel effects, an inter-channel dot placement method can reduce the incidence of mottle and other image artifacts, improving the visual appearance of the integrated image. A master threshold array may be used to produce halftone dot patterns for all color channels, but applied, in effect, on a shifted basis to promote improved inter-channel dot spacing.

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