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4.3. The hue-saturation-value (HSV) color model

Another way to characterize a color is in terms of the HSV model.

This diagram, called the single-hexcone model of color space, can help you visualize the meaning of the H, S, and V parameters.

The Ostwald diagram corresponds to a slice of this cone. For example, the triangle between red, white, and black is the Ostwald diagram for the varieties of red.