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Journal of Electronic Imaging

Color spaces for color-gamut mapping
Author(s): John J. McCann
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Paper 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 threedimensional 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 colorgamut image processing.

Paper Details

Date Published: 1 October 1999
PDF: 11 pages
J. Electron. Imaging. 8(4) doi: 10.1117/1.482716
Published in: Journal of Electronic Imaging Volume 8, Issue 4
Show Author Affiliations
John J. McCann, McCann Imaging (United States)

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