Abstract

This work continues previous research by the same authors [J. Opt. Soc. Am. A 23, 2077 (2006) ], where empirical small–medium color differences were represented by an ellipsoidal equation ΔEGP in the Uniform Color System of the Optical Society of America. Now logarithmic compressions on chroma and lightness are introduced to produce a new space with Euclidean color-difference formulas ΔEE. The CIEDE2000, ΔEGP, and ΔEE formulas are found statistically equivalent in the prediction of many available empirical datasets. However, ΔEE is the simplest formula providing relationships with visual processing. These analyses hold true for CIE 1964 Supplementary Standard Observer and D65 illuminant.

© 2008 Optical Society of America

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