Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-05-31
1992-12-29
Evans, Arthur G.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358454, 395109, G06K 1500
Patent
active
051758040
ABSTRACT:
A system and method for color image reproduction prepared from random fixed size dot placement. In one embodiment, a color image is digitized using a scanner or other input device to prepare a red, green, blue (RGB) data file which is input to a central processing unit (CPU). The RGB data file is converted to corresponding standard process color files of cyan, magenta, yellow and black (CMYK). The CMYK color files are then digitally processed by the CPU using an error diffusion method to generate data files containing representations for each of the CMYK process colors wherein the representations correspond to random fixed size dot representations containing information corresponding to color density and placement for each pixel of the color image. Color separation prints can then be output which can than be aligned and used to print a composite color image reproduction.
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patent: 4811239 (1989-03-01), Tsao
patent: 4852485 (1989-08-01), Brunner
Helene Eckstein, "Four-Color Fundamentals: Your guide to spot color, process color, and the ABC's of CMYK", Publish!, May 1989, pp. 44-49.
Keith Baumann et al., "The Full-Color Desktop: Publish tests the latest Mac and PC color correction and separation tools, and comes up with some surprising results", Publish!, May 1989, pp. 50-59.
Keith Baumann, "Do-It-Yourself Color Separations: Pre-Press Technologies puts a full-color prepares lab on your desktop", Publish!, May 1989, pp. 60-63.
Donald E. Knuth, "Digital Halftones by Dot Diffusion", ACM Transactions on Graphics, vol. 6, No. 4, Oct. 1987, pp. 245-273.
Evans Arthur G.
Onyx Graphics Corporation
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