[RFC wayland-protocols] Add the color-management protocol

[Graeme Gill]

Carsten Haitzler (The Rasterman) wrote:

> it's a different mapping of byte1, byte2, byte3 within a pixel to different r,g
> and b points in the visible spectrum. :)

It's not though - it's colorimetry, so there is no control
over the visible spectrum - the spectral characteristic is
determined by the display primary spectral characteristics,
and a change in representation/encoding doesn't imply
any change in the primaries. Even the RGB's haven't changed,
because the relationship between RGB <-> YCbCr is fixed
according to a given standard.

Graeme Gill.