[4.3.2 ] A system of describing colors in terms of color content, white content, and black content. It is usually exemplified by color charts in triangular form, with full color, white, and black at the apexes, providing a gray scale of white and black mixtures and parallel scales of constant white content as these grays are mixed with varying proportions of the full color. Each chart represents a constant dominant wavelength (called hue), and the colors lying on a line parallel to the gray scale represent constant purity (called shadow series).
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