COLOR IMAGING: DEVICE-INDEPENDENT COLOR, COLOR HARDCOPY, AND GRAPHIC ARTS

Three-dimensional gamut mapping using various color difference formulae and color spaces

[+] Author Affiliations
Naoya Katoh, Masahiko Ito

Sony Corporation, PNC Development Center, 6-7-35 Kita-shinagawa, Shinagawa, Tokyo?141-0001, Japan

Shin Ohno

Sony Corporation, B&P Company, 4-16-1 Okata, Atsugi, Kanagawa?243-0024, Japan

J. Electron. Imaging. 8(4), 365-379 (Oct 01, 1999). doi:10.1117/1.482705
History: Received Mar. 8, 1999; Revised Apr. 23, 1999; Accepted May 12, 1999
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Abstract

Gamut mapping is a technique to transform out-of-gamut colors to the inside of the output device’s gamut. It is essential to develop effective mapping algorithms to realize “WYSIWYG” color reproduction. In this paper, three-dimensional gamut mapping using various color difference formulae and color spaces are considered. Visual experiments were performed to evaluate which combination of color difference formula and color space for gamut mapping was most preferred for five images. The color difference formulae used in the experiments were ΔEab*,ΔEuv*,ΔE94,ΔECMC,ΔEBFD, and ΔEwt. The color spaces used in the experiments were CIELAB, CIELUV, CIECAM97s, IPT, and NC-IIIC. A clipping method was used that maps all out-of-gamut colors to the surface of the gamut, and no change was made to colors inside the gamut. It was found that gamut mapping using ΔE94,ΔECMC, and ΔEwt were effective in CIELAB color space. For mapping images containing a large portion of blue colors, ΔEBFD and ΔEuv* were found to be more effective. ΔEab* was least preferred for all images. With respect to color spaces, gamut mapping performed in the CIELUV color space was superior to any other color spaces for the blue region. We conclude that ΔE94 in CIELUV and ΔEBFD in CIELAB are the two most useful combinations of color difference formula and color space for gamut mapping, if we are to apply a single combination universally. © 1999 SPIE and IS&T.

© 1999 SPIE and IS&T

Citation

Naoya Katoh ; Masahiko Ito and Shin Ohno
"Three-dimensional gamut mapping using various color difference formulae and color spaces", J. Electron. Imaging. 8(4), 365-379 (Oct 01, 1999). ; http://dx.doi.org/10.1117/1.482705


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