In graphics we use RGB and other color spaces as an approximation to the full spectrum of light wavelengths. This evidently works pretty well in general, but are there any reasonably common objects/materials/phenomena, things you might encounter in your everyday life, whose appearance isn't represented well by RGB rendering due to having a complex emission/reflection/absorption spectrum?While the current answers are focusing mainly on colors outside a given RGB gamut, I'm also interested in hearing if there are examples where, for instance, the color of an object appears wrong when rendered in RGB because of an interaction between the light source spectrum and the object's reflection spectrum. In other words, a case where a spectral renderer would give you more correct results.Credit: I liked this question in the previous private beta so I'm reproducing it here. It was originally asked by Nathan Reed
Are there common materials that aren't represented well by RGB?
color