Bill Spitzak wrote: > The Y of the primaries can be used as alternative method of specifying the > whitepoint. (convert the > 3 Yxy colors to XYZ, add them, then convert back to Yxy and the xy is the > whitepoint, I think).
Correct, but this assumes the display is perfectly additive. Real world ones mightn't be, so Yxy or XYZ x RGBW does provide extra information. > I think the reason rgb sets are specfied as 4 pairs of xy (the three > primaries and the whitepoint) > instead of 3 triples is to remove the arbitrary multiplier that makes there > be 9 numbers instead of 8. A lot of display folk are very chromaticity diagram oriented - they are used to just specifying xy, and it's nice to have the white point be explicit so you can more easily check what the white point color temperature is. Graeme Gill. _______________________________________________ wayland-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/wayland-devel
