> A correct renderer would look correct to whatever creature was looking at it. Impossible. RGB is just a 3-bin spectrum. It's the minimum number of bins neede

> A correct renderer would look correct to whatever creature was looking at it. Impossible. RGB is just a 3-bin spectrum. It's the minimum number of bins needed to represent any color humans can perceive because we have 3 color sensors that are at least partly independent. You could always imagine a hypothetical creature with yet more sensors, until you need a bin for every possible wavelength of light. Eventually you'd effectively be simulating individual photons. The world has too many atoms for us to simulate it at that level. We sometimes use larger spectrums than RGB because while humans may not always be able to perceive the difference between two different spectrums of equivalent color, sometimes they interact differently with other things. For example, white light formed by the full spectrum of visible light will seperate into a rainbow when passed through a prism. White light formed by red, green and blue lasers may be indistinguishable when viewed directly, but will only seperate into red, green and blue when passed through a prism. The number of bins we use for that sort of simulation depends on how many we need to get a result that is a satisfactory approximation of reality. All models are wrong. The question is always whether they are good enough for our purposes.