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Language of Color: Saturation

Saturation  (sometimes called intensity) is the strength or purity of a hue. Expressions like "bright red" and "vibrant green" imply colors with highly saturated hues. On the other hand, "rust red" and "olive green" refer to low-saturation hues that look brownish or grayish. (Warm hues like red, orange, and yellow look brownish in low saturations; cool hues like blue, blue-green, and violet look grayish.)
The GIA Color Grading System divides saturation variations into six levels that run from 1, grayish or brownish, through 6, vivid. (As with hue and tone, more divisions are possible, but not desirable.)