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).
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.
Richard Hughes wrote:
On 4 May 2013 00:16, Kai-Uwe Behrmann <[email protected]> wrote:
+struct weston_edid_color_Yxy {
+ double Y;
+ double x;
+ double y;
+};
Why is the Y value set when it is all about primaries. No one will ever use
that other than for assuming 1.0 .
I assumed a standard type would be more useful than a custom type. If
it stays as Yxy, then colord can use it without having to do a:
var2->Y = 1.0;
var2->x = var1->x;
var2->y = var1->y;
...every time.
Richard
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