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

Color spaces for color-gamut mapping

[+] Author Affiliations
John J. McCann

McCann Imaging, Belmont, Massachusetts?02478

J. Electron. Imaging. 8(4), 354-364 (Oct 01, 1999). doi:10.1117/1.482716
History: Received Mar. 25, 1999; Revised May 21, 1999; Accepted May 29, 1999
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Abstract

Before doing extensive color gamut experiments, we wanted to test the uniformity of CIE L*a*b*. This paper shows surprisingly large discrepancies between CIE L*a*b* and isotropic observation-based color spaces, such as Munsell: (1) L*a*b* chroma exaggerate yellows and underestimate blues. (2) The average discrepancy between L*a*b* and ideal is 27%. (3) Chips with identical L*a*b* hue angles are not the same color. L*a*b* introduces errors larger than many gamut mapping corrections. We have isotropic data in the Munsell Book. Computers allow three-dimensional lookup tables to convert instantly any measured L*a*b* to interpolated Munsell Book values. We call this space ML, Ma, and Mb in honor of Munsell. LUTs have been developed for both LabtoMLab and MLabtoLab. With this zero-error, isotropic space we can return our attention to the original problem of color-gamut image processing. © 1999 SPIE and IS&T.

© 1999 SPIE and IS&T

Citation

John J. McCann
"Color spaces for color-gamut mapping", J. Electron. Imaging. 8(4), 354-364 (Oct 01, 1999). ; http://dx.doi.org/10.1117/1.482716


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