[mythtv-users] nvidia color calibration

[HP-mini]

On Fri, 2015-08-07 at 19:06 -0700, Paul B. Henson wrote:
> I've got a Sharp aquos tv and an onkyo receiver. The receiver is hooked up
> to the tv, and then I've got a mythtv box and a bluray player hooked up
> to the receiver. Unfortunately this means I can't calibrate the mythtv
> and bluray players separately :(. I at one time calibrated the TV for
> the bluray player, which left mythtv a bit off, you don't really notice
> it with general stuff, but for shows like the simpsons you can see the
> color is off.
> 
> So I finally got around to trying to use nvidia settings to tweak the
> colors on the mythtv box to look a little better, but it doesn't seem to
> work. When I fiddle with stuff at the mythtv menu screen, I can see the
> changes, but as soon as I play anything, it reverts to the way it
> usually looks, then switches back to the custom colors when going back
> to the menu.  It seems the calibration only applies to the GUI, not the
> video? I'm using VDPAU, if that makes a difference.
> 
> Is there any way to apply color corrections to the video output?
> 
> I considered at one time hooking the mythtv box up directly to the TV
> with one output, and then to the receiver with another, allowing both
> bitstreaming audio to the receiver and a dedicated input on the tv to
> calibrate. But then the stupid tv turned out to only have one custom
> mode that was global across all inputs, not unique to each, so even that
> wasn't going to work :(.
> 
> Hopefully by the time I get my next tv and receiver, the tv will be able
> to tell that there are different devices behind the one input and let
> each one be calibrated appropriately <sigh>.
> 
> Thanks...
> _______________________________________________

Have you tried setting VDPAU playback to studio levels (reduced range
colourspace)?
This should be the colourspace the BD player (any consumer video) is
using.
Non-studio levels (full range) is for driving computer monitors.
There is a OSD menu option for this in mythtv & a setting in
"nvidia-settings"