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Proceedings Paper

The Design Of A Graphic Arts Halftone Screening Computer
Author(s): Larry G Wash; John F Hamilton
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Paper Abstract

In the graphic arts industry, a digital image is stored as four continuous tone files of Cyan, Magenta, Yellow, and Black (CMYK). These are the most common colors used in a 4-color ink printing process. Since a printing press cannot print "differential" amounts of ink at a given location, printers achieve fine tonal gradations by printing halftone dots of smoothly changing "areas". A screening computer's primary function is to convert these continuous tone pixel values into halftone dots. In general, the task of transforming continuous tone pixel values into halftone dots is computationally intensive. Furthermore, when using a high resolution output writer, screened halftone bitmapped images can easily exceed 100 Mbytes per separation, resulting in lengthy and unacceptable screening times. As a result, the sheer volume of data that must be manipulated in the screening process dictates the need for a high performance, special purpose screening engine, which does not degrade the performance of the target system. This paper first introduces the fundamental theory and concepts of electronic digital halftone screening. Second, a set of fundamental functional requirements for a digital screening computer are developed. Third, a parallel, pipelined screening computer design, which meets the developed functional requirements, is presented. Last, an illustration of digitally screened halftone dots is provided.

Paper Details

Date Published: 17 April 1989
PDF: 36 pages
Proc. SPIE 1073, Electronic Imaging Applications in Graphic Arts, (17 April 1989); doi: 10.1117/12.952554
Show Author Affiliations
Larry G Wash, Eastman Kodak Company (United States)
John F Hamilton, Eastman Kodak Company (United States)

Published in SPIE Proceedings Vol. 1073:
Electronic Imaging Applications in Graphic Arts
Kennard S. Cloud, Editor(s)

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