Color model that describes colors in the same way as the human eye perceives them, using hue, saturation (also known as chroma) and brightness (or luminance). The hue is defined by its position in a color circle and is specified by an angle lying between 0 and 360?. The saturation corresponds to the amount of gray in the color mixture and has values of between 0 percent for gray and 100 percent for pure color. The values for brightness also range from 0 percent for black and 100 percent for white.

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