System for printing color images with extra colorants in additio

Details System for printing color images with extra colorants in additio System for printing color images with extra colorants in additio

1996-11-20

1999-04-06

Lee, Thomas D.

Image analysis

Histogram processing

For setting a threshold

382162, 358536, H04N 150

Patent

active

058928910

ABSTRACT:
In a "hi-fi" color printing system, wherein colorants of hi-fi colors beyond the regular CMYK primary colorants are available, a main gamut obtainable with the CMYK colorants only is mutually exclusive with at least one extended gamut in which a hi-fi colorant is used and a complementary one of the CMY colorants is excluded. Because the main and extended gamuts are mutually exclusive, no more than four colorants are used in any part of the image, and no more than four halftone screens need be used to obtain any desired color.

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Ostromoukhov "Chromaticity Gamut Enhancement by Heptatone Multi-Color Printing," SPIE, vol. 1909, p. 139, Jun., 1993.
Boll, "A Color to Colorant Transformation for a Seven Ink Process," presented at the IS&T-SPIE Symposium on Electronic Imaging, Science and Technology, Feb., 1994.
"New Era of Digital Photo Printing . . . " Hard Copy Observer, Oct. 1996, p. 1, and its ancillary articles.

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