About

A hue is called pure without:

• any white, black, grey (no lightness)
• or complementary in it.

The degree of purity of a hue is defined by the color intensity property.

This is known as a natural value where they look the purest.

If the color was not tinted, shaded or toned, the color is of pure hue.

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The pure hue are the primary color in a color system (colorspace)