B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 29/00 (2006.01) G03F 3/00 (2006.01) G06T 5/50 (2006.01) H04N 1/58 (2006.01)
Patent
CA 2742154
A method is described for overcoming the adverse visual effect of mis- registered 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.
Gowling Lafleur Henderson Llp
International Paper Company
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