chroma,
n a measurement of color saturation or the degree of color pureness. A color that is identified with a high chroma hue is almost completely free of white.
Munsell colour system
A system of classification of colours composed of about 1000 colour samples, each designated by a letter and number system. The letter and number of each sample indicate its hue, saturation (called chroma in this system) and brightness (called value). They are represented by a three-dimensional polar coordinate system in which the hue is represented along the circumference, the value along the vertical axis and the chroma along a radius (Fig. M14). See colorimetry; Farnsworth test.
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Fig. M14 Schematic representation of the three coordinates of the Munsell colour system
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