color wheels
http://www.worqx.com/color/color_wheel.htm
terminology
Chroma: How pure a hue is in relation to gray
Saturation: The degree of purity of a hue.
Intensity: The brightness or dullness of a hue. One may lower the intensity by adding white or black.
Luminance / Value: A measure of the amount of light reflected from a hue. Those hues with a high content of white have a higher luminance or value.
Shade and tint are terms that refer to a variation of a hue.
Shade: A hue produced by the addition of black.
Tint: A hue produced by the addition of white.
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