OSA | Living History

Color is defined using hue, saturation and brightness.

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Color

When light interacts with specialized cells in the retina, the brain perceives hues that correspond to specific wavelengths in the visible spectrum.

Humans can distinguish about 10 million different colors based on combinations of red, blue and green. (Photo: iStock.com/Roman Samokhin)

(Courtesy of iStock.com/Roman Samokhin)