MacAdam ellipses

ellipses, MacAdam

Areas in the CIE chromaticity diagram, each in the form of an ellipse within which the colour appears the same. The size of each ellipse varies in the diagram, being larger for greens than for blues or reds. The ellipses are distorted for colour deficient individuals.
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376, which specifies smaller four-step MacAdam ellipses for linear and some compact fluorescent lamps.
Seen side-by-side, however, two colors that are seven MacAdam ellipses apart are easily distinguishable.