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| Trichromacy or trichromaticism is the condition of possessing
three independent channels for conveying color information,
derived from the three different cone types. Organisms with
trichromacy are called trichromats. The normal explanation of
trichromacy is that the organism's retina contains three types
of color receptors (called cone cells in vertebrates) with
different absorption spectra. In actuality the number of such
receptor types may be greater than three, since different types
may be active at different light intensities. In vertebrates
with three types of cone cells, at low light intensities the rod
cells may contribute to color vision, giving a small region of
tetrachromacy in the color space. Humans and other animals that
are trichromatsEdit Humans and closely related primates are
usually trichromats, as are some of the females of most species
of New World monkeys, and bot