They did over saturate the colors though.
Just about any medium, man works with... a certain amount of surrealism will take place. Man always enhances what he/she sees.
Even in photography, you can develop the film to do this automatically for you.
A woman putting makeup on is only exaggerating color and features.
When you pick flowers up at the market or a flower shop, they've been tooled with to a certain extent.
Nothing is ever going to be exactly as we see it with our eyes.... and then that doesn't take into consideration what you see and how you perceive or your mind interprets the colors.
My father was color blind, but he was happy that he could see. I'm color-blind to an extent, but I've learned to cope and make changes in how I work with color.