New algorithm for under color removal (UCR) using direct color mapping

Masato Tsukada; Johji Tajima

doi:10.1117/12.207595

27 April 1995 New algorithm for under color removal (UCR) using direct color mapping

Masato Tsukada, Johji Tajima

Proceedings Volume 2413, Color Hard Copy and Graphic Arts IV; (1995) https://doi.org/10.1117/12.207595
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

Color transformation from RGB to CMYK is a significant problem in color reproduction. Since black ink is a redundant component, it is impossible to find a unique set of CMYK ink quantity suitable for an input RGB color. This paper proposes an algorithm for UAR, using the direct color mapping method from RGB to CMYK. It directly searches a measured gamut space for a printer for more than one set of CMYK ink quantities suitable for an input color with out using a reproduction model or a nonlinear equation. A set of CMYK ink quantity, suitable for an input color, is flexibly calculated from several sets of CMYK ink quantity by using interpolation controlled by an adjusting coefficient of black ink quantity. The flexible computation of black ink quantity makes it possible to adjust a delicate image appearance. This algorithm can be applied to various kinds of printers, because it does not require a model of the printer's color reproduction mechanism.

Citation Download Citation

Masato Tsukada and Johji Tajima "New algorithm for under color removal (UCR) using direct color mapping", Proc. SPIE 2413, Color Hard Copy and Graphic Arts IV, (27 April 1995); https://doi.org/10.1117/12.207595

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