Color images having multiple separations with minimally overlapp

Details Color images having multiple separations with minimally overlapp Color images having multiple separations with minimally overlapp

1995-11-16

1997-05-20

Vu, Kim

Facsimile and static presentation processing

Natural color facsimile

Image reproduction

358535, 358536, 358520, 347251, 395109, H04N 146

Patent

active

056317484

ABSTRACT:
Halftone screens are generated for each separation in accordance with the goal of avoiding overlapping whenever possible. Initially, the black separation is halftoned, generating a dot pattern with a number of ON pixels and OFF pixels in accordance with the area density of the black separation. Next, a first color separation is halftoned, setting a number of the previous OFF pixels to ON. Then, if any white pixels remain, the second color separation is halftoned, setting a number of the previously OFF pixels to ON. If during the processing of the second and third separations, it is determined that no OFF pixels exist to be turned ON, a second layer of color is started, respectively superimposed over the first layer. The third color separation is halftoned in reverse fill-in order, setting a number of the previous OFF pixels to ON. Each layer is started and arranged so that the additional colors forming the dot pattern are not placed on any black areas.

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Po-Chieh Hung, "Tetrahedral Division Technique Applied to Colorimetric Calibration for Imaging Media"; Annual Meeting IS&T; NJ; May, 1992; pp. 419-422.
Po-Chieh Hung, "Colorimetric Calibration for Scanners and Media", SPIE, vol. 1448; Camera and Input Scanner System (1991).
Sigfredo I. Nin et al., "Printing CIELAB Images on a CMYK Printer Using Tri-Linear Interpolation", SPIE Proceedings, vol. 1670, 1992, pp. 316-324.

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