Color spaces for color-gamut mapping

Before doing extensive c%r 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 obselVatjon~based c%r 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 aI/ow threedimensional lookup tables to convert instantly any measured L ljI a ljl 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. Cl 1999 SPIE and IS&T. [5101 7-9909(99)00804-1]

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