purity (of a colour stimulus)

measure of the proportions of the amounts of the monochromatic stimulus and of the specified achromatic stimulus that, when additively mixed, match the colour stimulus considered

NOTE 1 In the case of purple stimuli, the monochromatic stimulus is replaced by a stimulus whose chromaticity is represented by a point on the purple boundary.

NOTE 2 The proportions can be measured in various ways (see "colorimetric purity" and "excitation purity").

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