[Openicc] XICC specification draft (Xinerama vs. composite).

[Graeme Gill]

Chris Murphy wrote:
> Photoshop has been doing display compensation of sorts since version  3, 
> with respect to fully integrated CMYK images being displayed on an  RGB 
> screen. And RGB>RGB display compensation came with Photoshop 5.0.  There 
> was no perceptible performance impact, but Adobe was doing this  on 
> screen resolution data only (and what was going to actually be  
> displayed), not on the full 200MB image data you had open. And this  was 
> on substantially less hardware than what we have today, and  certainly 
> without the GPU having anything to do with it.

When you're doing pre-press work, a slight performance penalty
is probably a fine trade-off for accurate color. If your writing
an interactive game, then you might not appreciate high quality
color at the expense of frame rate. A core component of the display
system (such as X11) can't afford to alienate one sector of users
for the benefit of another, so performance can be a critical factor.
If better color can't be implemented with negligible overhead,
then it really has to be an option thing, where the application
gets to choose what's important.

Graeme Gill.