[cairo] RFC the idea of n-plane color support

[Carl Worth]

On Sun, 31 Oct 2004 11:05:44 +0100 (CET), Kai-Uwe Behrmann wrote:
> How passes an ICC profile through Cairo to an final PDF output or to glitz
> for monitor correction? Physical devices are allways different.
> As Microsoft plans to overcome GDI, they will go steps further to
> support 8/16-bit (sRGB,scRGB,CMYK,n-color) colorspaces in WCS.

The concept in cairo is that the user input color is all specified in
sRGB. Currently implemented backends are 8-bit per channel, but the API
is floating-point so future 16-bit or floating-point backends are
possible.

Since cairo provides only an sRGB API, it just assumes that the monitor
is already calibrated to sRGB. So the calibration issue is external to
cairo.

-Carl