That's not at all about fine detail, but is about relative amounts of absorption/reflection of the light between skin vs. vein. See https://en.wikipedia.org/wi

That's not at all about fine detail, but is about relative amounts of absorption/reflection of the light between skin vs. vein. See https://en.wikipedia.org/wiki/Metamerism_(color) https://en.wikipedia.org/wiki/Metamerism_(color)