[argyllcms] Re: nVidia GeForce & deep colour support in Linux

  • From: János, Tóth F. <janos666@xxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 30 Aug 2014 22:29:55 +0200

As much as I know, FirePro and Quadro drivers offer nonstandard
proprietary ways to display 10-bit images inside windowed application
over a "legacy" 8-bit desktop manager (thus the user isn't forced into
DirectX or OpenGL fullscreen exclusive rendering modes and the
developers don't need to create their own specialized user interface
for that unique display mode).

The Radeon cards from the HDMI / DisplayPort and DirectX 11.x era are
proved to work in 10 bit DirectX fullscreen display modes.
I am not sure about the Geforce cards but it should be a matter of
driver support (I bet the hardware is capable to do it since every
DX11 cards should be).

2014-08-30 21:52 GMT+02:00 Marwan Daar <marwan.daar@xxxxxxxxx>:
> Not sure if this is helpful, relevant, or even meaningful, but my
> understanding is that regular geforce cards only support 10 bit in a directx
> environment, whereas you need the quadro for 10 bit open gl support
> (although it's disturbing that Chris is having issues despite his quadro
> card).
> Marwan
>> Hello,
>> sorry for an off-topic question: does anybody have a working setup in
>> Linux like:
>> x nVidia GeForce & Display Port & native 10-bit depth LCD
>> x nVidia GeForce & Display Port & native 8-bit + FRC LCD panel [1]
>> [1] http://www.tftcentral.co.uk/reviews/dell_u2713h.htm
>> or  http://www.prad.de/new/monitore/test/2013/test-asus-pa279q.html
>> Based on earlier announcement [2], nvidia binary driver for Linux
>> supports 30-bit depth (RGB) in X for some time already. I succeed
>> turning it on and got some glitches / colour artefacts as described on
>> oyranos blog [3].
>> [2] http://www.nvidia.com/object/linux-display-ia32-295.20-driver.html
>> [3] http://www.oyranos.org/2014/05/image-editing-with-30-bit-monitors/
>> However, the 1024-step ramp remained displayed on my U2713H with 8-bit
>> gradation only (in Krita with OpenGL backend on, which is one of the few
>> apps supposedly supporting deep colour output).
>> Also dispcal with ColorMunki Photo reports 8-bit precision of video-card
>> LUT only.
>> I have access neither to Quadro card nor to native LCD to do more tests.
>> So, has anybody made GeForce to output Deep Colour in Linux or is it a
>> futile effort? (I have been googling and asking for a few weeks now w/o
>> success.)
>> Regards,
>> Milan

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