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MacAdam ellipse - Wikipedia

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In the study of color vision, a MacAdam ellipse is roughly a region on a chromaticity diagram which contains all colors which are indistinguishable, to the average human eye, from the color at the center of the ellipse. Specifically, it is the standard deviation of a number of experimental color matches to the central color assuming a bivariate normal distribution of these match points. A MacAdam ellipse thus contains about 67% of the color match points. A 2X MacAdam ellipse will contain about 95% of the match points, and a 3X MacAdam ellipse will contain about 99% of the match points. The contour of the ellipse is therefore a measure of the just-noticeable differences of chromaticity. Standard Deviation Color Matching in LED lighting uses deviations relative to MacAdam ellipses to describe color precision of a light source.[1]

MacAdam ellipse - Wikipedia Jump to content From Wikipedia, the free encyclopedia Region of chromaticity diagram This article's tone or style may not reflect the encyclopedic tone used on Wikipedia . See Wikipedia's guide to writing better articles for suggestions. ( October 2023 ) ( Learn how and when to remove this message ) MacAdam ellipses for one of MacAdam's test participants, Perley G. Nutting (observer "PGN"), plotted on the CIE 1931 xy chromaticity diagram. The ellipses are ten times their actual size, as depicted in MacAdam's paper [ 1 ] . In the study of color vision , a Mac

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