I agree

To work that out you might need to make a fully textured and realistically lit Blender model of the place, but I think that is probably going quite a bit too much further than is necessary. Most of us can't see any of those tiny nuances in tone and colour to be able to put a name on them, and what is more the human brain has a wonderful capacity to fill a lot of such detail automatically based on experience and what might be expected to be there - in real time.

An amazing thing, the brain