I actually agree with David. Cameras do record what the general population sees. This doesn't affect the scientific assertation (I didn't invent this, folks, it's accepted fact) that the concept of "color" as we are discussing here, exists only in the human mind. We haven't been going back and forth at all. We actually are not really discussing the same thing. I am seeing a lot of resistance to the idea of color perception as a psychological phenomenon. I detect a desire by some to connect the colors we perceive in nature to some kind of absolute. It's not so. I have nothing more to add, really, if you choose not to believe it, it's no skin off my nose. I just offered an admittedly esoteric scientific tidbit that isn't often talked about.