Color separation method and printed product of the method

Details Color separation method and printed product of the method Color separation method and printed product of the method

2007-08-14

2007-08-14

Williams, Kimberly A. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S518000, C358S002100, C358S003270, C347S232000, C347S240000

Reexamination Certificate

active

10128969

ABSTRACT:
A method is described for overcoming the adverse visual effect of misregistered ink planes in multiple ink color prints. Color separations are initially made in a normal fashion. The separation carrying the greatest object detail is then chosen as a luminance or achromatic channel. This may be used as is or preferably it is sharpened using a high pass filter. Normally this separation will be black. However, it may be a surrogate color for black, particularly if only two or three separations are made. Object detail in all other separations (chrominance separations) is degraded, usually by a low pass filter such as a Gaussian blur. The printed image formed when the separations are recombined in a conventional manner is remarkably visually tolerant of misregistration of the various ink planes in the image.

REFERENCES:
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patent: 5801745 (1998-09-01), Wada et al.
patent: 5802361 (1998-09-01), Wang et al.
patent: 5946112 (1999-08-01), Kobayashi
patent: 6018600 (2000-01-01), Levin et al.
patent: 6236754 (2001-05-01), Harrington

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