ConstReadonlyACES: XyzACES White Point (Approx D60). Standard for: ACEScg, ACEScc (Cinema). X: 0.952646, Y: 1.00000, Z: 1.008825
ReadonlyC: XyzC - Average Daylight (Obsolete, but used by old NTSC). X: 0.98074, Y: 1.00000, Z: 1.18232
ReadonlyD50: XyzReadonlyD65: XyzReadonlyE: XyzIlluminant E (Equal Energy). Teorethic (flat spectrum). Used in some pure math. X: 1.0, Y: 1.0, Z: 1.0
XYZ coordinates of Standard White Points. Normalized with Y = 1.0. From: ASTM E308-01 / CIE 15:2004.