Flexible gray component replacement (GCR) based on CIE L*a*b*

Hitoshi Ogatsu; Kazumasa Murai; Shinji Kita

doi:10.1117/12.206540

10 April 1995 Flexible gray component replacement (GCR) based on CIE L*a*b*

Hitoshi Ogatsu, Kazumasa Murai, Shinji Kita

Proceedings Volume 2414, Device-Independent Color Imaging II; (1995) https://doi.org/10.1117/12.206540
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

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.

Citation Download Citation

Hitoshi Ogatsu, Kazumasa Murai, and Shinji Kita "Flexible gray component replacement (GCR) based on CIE L*a*b*", Proc. SPIE 2414, Device-Independent Color Imaging II, (10 April 1995); https://doi.org/10.1117/12.206540

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