Color constancy is achieved by chromatic adaptation. The Intercontinental Commission on Illumination defines white (adapted) as "a colour stimulus that an observer that's [chromatically] tailored on the viewing environment would judge to generally be beautifully achromatic and to have a luminance issue of unity. Wise Vocabulary: similar words and phrases https://landenjxhrc.uzblog.net/everything-about-rose-breasted-cockatoo-49514143