Trichromacy
（重定向自Trichromat）
![Close-up of a trichromatic in-line shadow mask CRT display, which creates most visible colors through combinations and different levels of the three primary colors: red, green, and blue](/Images/godic/202502/17/Tricolour_television_close_up0445.jpg")
![Normalised responsivity spectra of human cone cells](/Images/godic/202502/17/Cones_SMJ2_E.svg0445.png")
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.