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Colors do not exist outside the brain. They can't be measured. Objects do not have color. They merely absorb and reflect different wavelengths of light due to the number of electrons, and the configuration of the electrons in their most outer electron shell. Electrons don't have color. And when we look at an object all we see are photons that have been emitted by the electrons in the outer orbit of that object. Every electron is exactly the same as every other electron The only thing we can see, hear, feel, smell or touch are electrons.

Our eyes send an electrical signal to our visual cortex. There is no color in that electrical signal. Our eyes do not create color, they only generate an electrical signal. The colored cones in our eyes are only sensitive to certain frequencies of light which we associate with different colors because those frequencies of light cause our brains to manufacture a certain color every time those cones detect that frequency of light.

Humans evolved color vision because it makes it easier for us to tell the difference between different objects. And different objects do normally reflect certain wavelengths of light. NASA falsely colorizes their Black and White images to make it easier to see certain features.

There is no way to know if the color you see as red is the same color I see as red. Someday, we may be able to ensure we all see the same the same color when we look at an object. But that day is long off. Everything we see is virtual reality inside our brain, created by our brain, based on our sensory input taken from the real universe around us.

Humans can see color even if they have no eyeballs. Some people dream in color.