Abstract

The precision of color matching is commonly described by color-matching ellipses, and the precision of matching color differences can be described by color-difference-matching ellipses. Recently obtained sets of color-matching ellipses and color-difference-matching ellipses have been compared and some important correlations are indicated. At a given location in color space, and for a given observer, the orientation and shape of a color-difference-matching ellipse are similar to those of the color-matching ellipse. The size of the color-difference-matching ellipse is always larger than the color-matching ellipse and increases linearly with the perceptual size of the color differences to be matched. There is also an indication that color-matching ellipses generally cannot be used to predict the equality of color differences that are several times a just-noticeable difference. This may have important consequences on the present practice of matching such color differences by methods based on color-matching ellipses.

© 1972 Optical Society of America

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