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Purple colors, which do not exist in the spectrum of pure light, are found at the 
bottom of the diagram. Purples are mixtures of red and blue light—the opposite ends 
of the spectrum. 

A color can be described in terms of three varying characteristics, called the 

 

color model: 

• Hue—tint (the qualitative aspect of a color—red, green, or orange)

• Saturation—the purity of the color

• Brightness—relative position between white and black

While the CIE chromaticity diagram shown earlier conveys hue and saturation, 
a three-dimensional color model is required to add the brightness component, as 
shown in the following figure.