[Intel-gfx] HDMI colour space and depth questions (YCbCr, xvYCC, Deep Colour)

Jesse Barnes jbarnes at virtuousgeek.org
Mon Jan 16 19:03:46 CET 2012

On Sun, 15 Jan 2012 10:48:28 +0000
Andy Burns <xorg.lists at burns.me.uk> wrote:
> OK, enough scene-setting, here are the xorg questions ...
> Is there any xorg.conf setting to switch the HDMI output to YCbCr mode
> instead of RGB mode?

No, we haven't exposed that yet.  On some chipsets it may mean
configuring colorspace conversion in the pipe code.  Paulo has been
looking at some of this...

> Similarly is there any setting to indicate an xvYCC gamut, which might
> persuade the amp not to clip the colours?

There is a way to configure the gamut to be compressed (default) or
expanded (up to 255).  But that's not exposed either.

> And finally, is there any support for DeepColour (30bpp or 36bpp)?

There is some 30 bit support in place, but not 36bpp, which is what
HDMI sinks generally want.  Doing that properly involves doing gamut
expansion, since most sources aren't 36bpp unless you have very
specific kinds of source data (e.g. custom HD DVD movies or something).

Jesse Barnes, Intel Open Source Technology Center
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