How many colors can the human eye distinguish?

"Experts estimate that we can distinguish perhaps as many as 10 million colors." 10 million: Kleiner, Kurt. What we gave up for colour vision. "New Scientist." January 24, 2004: 12. "Humans, other apes, and Old World monkeys have trichromatic vision, with eyes containing three colour receptors, sensitive to blue, green, and yellow-red. read more

” In your eye is the retina. The retina has two types of cells - rods and cones. read more

Although the human eye can distinguish up to a few hundred hues, when those pure spectral colors are mixed together or diluted with white light, the number of distinguishable chromaticities can be quite high. [ambiguous] In very low light levels, vision is scotopic: light is detected by rod cells of the retina. read more