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

[Richard Morton]

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.

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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