HOW MUCH YOU NEED TO EXPECT YOU'LL PAY FOR A GOOD SULPHUR CRESTED COCKATOO

Color constancy is attained by chromatic adaptation. The Intercontinental Commission on Illumination defines white (adapted) as "a shade stimulus that an observer who's [chromatically] tailored into the viewing atmosphere would choose to get completely achromatic and to have a luminance component of unity.Differences inside the normal abundances ca