When we speak of being “colour blind” we call it a defect. But there could easily be other different capacities, none of which are manifestly better of worse than the others and we should also remember that a person can spend his life without ever noticing that he is colour blind until some special event shows this to be the case.
In a film, as in a photograph, although the face and hair seem grey; they seem quite natural. On the other hand, in a film, the food on a plate often seems grey and therefore, quite unappetising.
Ludwig Wittgenstein in “Notes on Colours”, Edition 70, pages 57 and 121.