Color constancy is realized by chromatic adaptation. The Global Fee on Illumination defines white (tailored) as "a color stimulus that an observer that's [chromatically] tailored into the viewing natural environment would decide for being perfectly achromatic and to have a luminance variable of unity. The color white is usually portrayed https://reidfvgzh.bloggerswise.com/43449005/indicators-on-white-tail-black-cockatoo-you-should-know