Colored cones in the eye?!

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Humans can perceive color in various frequencies. ROYGBIV -- Red Orange Yellow Green Blue Indigo Violet. Our brain perceives color by comparing the strength of the signal it receives from the three different cones. If the color is say a true green then it will only stimulate the green cones. But if the color is shifted a little more say into red it will stimulate both the green and the red cones. The more the light shifts toward the red, the more the red cones will fire in intensity and the less the green cones will fire. So by comparing how each cone is firing, the brain then interprets what color the light was. If all cones fire with the same intensity then the brain interprets the color as being white.

Me. I am an optometric physician.

Different cones are stimulated at different frequencies. For example, if you want a very bluish purple, you wouldn't mix a ton of red paint with a little blue. So essentially, all types of cones are stimulated at all frequencies, but their level of stimulation varies and the differences are why we can see all different colors.

all colors are a mixture of combinations and permutation of these three basic color, or the other way is that since we have three cone system we perceive and think that there are only those colors which we get from their mix.imagine having for or five different cones.