Three-dimensional threshold of color-difference perceptibility in painted samples: Variability of observers in four CIE color regions†
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In four of the five CIE color regions, the correlation of perceptibility of color differences and colorimetric measures is studied for painted samples at threshold. Sample pairs resulting in three-dimensional color differences ranging from zero to just clearly perceptible were used. The variability of color-difference ellipsoids is shown for single observers and for observer groups. Randomisation of mean results by a Monte-Carlo method produces deviation ellipsoids that describe shells of uncertainty inherent in the data. Interobserver and inter-group variability turns out to be widely covered by random noise, but the variances leave some stability of ellipsoid shapes. Color-difference formulas should be able to predict color differences within the shells of uncertainty.
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