[mythtv-users] Really washed out picture since upgrade to 0.24.0

[Andre]

On 21 Nov 2010, at 15:42, Richard Morton wrote:

> So studio levels is the name used when rgb is mapped to values 16-235... and full range is 0-255.
> 
> Sorry but that isnt something i have had to deal with... yet.
> 
> I am still on 195 series i think and only have one monitor driven via dvi/hdmi at the moment. I dont even know if the monitor could handle yuv.

I'd hold off on 260 for a while, it's working through some problems right now!

Usually a TV will accept YUV over HDMI, sometimes over DVI too, very few PC only monitors will accept YUV. Of course these days there is little difference between a PC monitor and a HDTV so the lines are blurring.



> 
> R
> 
> 
> 
> Please excuse brevity and pistakes, this email was sent from my Android smart phone.
> 
> Thanks and best regards,
> 
> Richard Morton
> 
> On 21 Nov 2010 15:19, "Paul Gardiner" <lists at glidos.net> wrote:
> > On 21/11/2010 13:59, Dan Christensen wrote:
> >> Can someone summarize the issues here regarding studio levels? Maybe
> >> someone can create a FAQ for myth about this?
> >>
> >> - What are studio levels?
> > 
> > When YUV is converted to RGB, you get values from 0 to 255 for each gun.
> > But not all the values are used. 16 is actually the blackest black, and
> > 235 is the brightest white. Any values below 16 are called blacker than
> > black, and I presume they are supposed to be clipped. Values above 235
> > might be clipped, or might be shown brighter than 235 if the display
> > has head room.
> > 
> > Most computers monitors interpret 0 as black and 255 as white, so most
> > PCs expand the range 16-235 onto 0 to 255. If you drive a TV via HDMI
> > like that you'll get too much contrast and you'll lose some of the
> > darkest and lightest greys.
> > 
> >> - Where are the settings for nvidia and myth? What are the defaults?
> > 
> > I don't know about the nvidia settings, but in myth, when using vdpau,
> > you can add the filter vdpaustudio in the render setup to make the
> > values 16-235 be mapped through unchanged.
> > 
> >> - What do most TVs do?
> > 
> > I believe most TVs expect studio levels on HDMI and full range on VGA.
> > 
> >> - How does this relate to YUV?
> > 
> > You don't have to worry about it for YUV.
> > 
> > Paul.
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