Printing of digital color images with locally adjusted...

Details Printing of digital color images with locally adjusted... Printing of digital color images with locally adjusted...

2005-01-11

2005-01-11

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003150, C358S534000

Reexamination Certificate

active

06842268

ABSTRACT:
A method of and apparatus for printing color images by the superimposition of a number of separations, using a first half-tone technique optimized for surface reproduction, such as dithering, and a second half-tone technique, differing from the first and optimized for edge reproduction, such as thresholding with error diffusion, is disclosed. The second half-tone technique is used in edge transitions for pixels of a separation which substantially influences the edge transition, and the first half-tone technique is used outside the edge transition. And the first half-tone technique is used throughout in the case of pixels of a separation which provide no or minimal contribution to the edge transition.

REFERENCES:
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patent: 5032853 (1991-07-01), van Stiphout et al.
patent: 5970178 (1999-10-01), Lin
patent: 0110353 (1984-06-01), None
patent: 0889641 (1999-01-01), None
Wong K.Y. et al. “Adaptive Switching of Dispersed and Clustered Halftone Patterns for Bi-Level Image Rendition” SID International Symposium, Digest of Technical Papers, Society for Information Display, Los Angeles (US), 1977, bladzijden 124-135, XP000605139.

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