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Proceedings Paper

Flexible gray component replacement (GCR) based on CIE L*a*b*
Author(s): Hitoshi Ogatsu; Kazumasa Murai; Shinji Kita
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Paper Abstract

To improve the color fidelity of 4 color reproduction and to increase the flexibility of Gray Component Replacement (GCR) for the text and continuous images, a novel GCR algorithm based on CIE L*a*b* signals is proposed. The algorithm consist of (1) maximum (achromatic) black determination part, (2) black adjustment part based on chroma, and (3) 3 color determination part. On this configuration, black signal is determined ahead of MCY signals, and the freedom of 3 input i.e L*a*b* 4 output i.e. CMYBk conversion is concentrated in (2). By using xerographic color printer, by neural network technique for resolving this, the algorithm is examined. As a result, it is shown that the algorithm can conserve the color fidelity in any GCR rate, and which is applicable on both of text and continuous images.

Paper Details

Date Published: 10 April 1995
PDF: 11 pages
Proc. SPIE 2414, Device-Independent Color Imaging II, (10 April 1995); doi: 10.1117/12.206540
Show Author Affiliations
Hitoshi Ogatsu, Fuji Xerox Co., Ltd. (Japan)
Kazumasa Murai, Fuji Xerox Co., Ltd. (Japan)
Shinji Kita, Fuji Xerox Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 2414:
Device-Independent Color Imaging II
Eric Walowit, Editor(s)

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