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Metamerism (Color)

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Metamerism (color) - Wikipedia

metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.

https://en.wikipedia.org/wiki/Metamerism_(color)

human eye contains only three color receptors (three types of cone cells), which means that all colors are reduced to three sensory quantities,

https://en.wikipedia.org/wiki/Metamerism_(color)

Metamerism occurs because each type of cone responds to the cumulative energy from a broad range of wavelengths, so that different combinations of light across all wavelengths can produce an equivalent receptor response and the same tristimulus values or color sensation

https://en.wikipedia.org/wiki/Metamerism_(color)