color wheel/circle, hue circuit

color wheel/circle, hue circuit (In French cercle chromatique) systematic arrangement of hues of maximum chromaticness as the starting point for a color ordering system. The arrangement is effected either clockwise or counterclockwise, but always in accordance with the wavelengths in the light spectrum, whereby the beginning (blue-violet) and end (red-orange) of the visible spectral ranges are bridged by a purple area. Depending on the task, the hues are arranged as perceptually equidistant (Munsell, CIELAB) or with a complementary opposite (Ostwald system).