[Openicc] Re: xcalib in Oyranos package

[Hal V. Engel]

On Tuesday 04 October 2005 02:34 pm, Kai-Uwe Behrmann wrote:
snip

> > > By the way, you are allready ahead in multi monitor support?
> >
> > Multi head support is already possible by using the standard X interfaces
> > and running xcalib for every display. The limit is usually Xinerama,
> > which doesn't allow to set multiple LUTs, since it's one logical screen.
> > The other limit is the hardware itself, which has only one LUT for either
> > the primary output or common for all outputs. I don't know about the
> > newer cards (especially ATI, nVidia Quadro series and the Matrox
> > Parhelia), whether they can be set independently, but there are probably
> > others, who can jump in and report. 

I asked nVidia support about LUTs on single card multi monitor setups a couple 
of weeks ago.  I specifically asked about the hardware and told them that I 
was not asking about current driver limitations.  I was told that all nVidia 
cards have only one LUT.  So at the present no available nVidia card supports 
setting independent LUTs for more than one monitor per video card.   

In addition as far as I know on Windows you can't even specify different 
profiles for monitors that are attached to the same video card.   I know for 
a fact that this is true for my Matrox card.  The Windows driver standard for 
video cards simply does not support color managing more than one display per 
video card.  Until that changes video card manufacturers are not likely to 
implement more than one LUT per GPU.  Does anyone know if this has changed in 
Longhorn?
 
Hal