[mythtv-users] Recording/live-tv video quality (aka do, PVR150 encoders suck?)

Brian Wood beww at beww.org
Tue Jan 29 01:34:17 UTC 2008

Brad Fuller wrote:
> On Jan 28, 2008 5:22 PM, Brian Wood <beww at beww.org> wrote:
>> Brad Fuller wrote:
>>>> Another problem is that computer video cards and monitors rarely seem
>>>> to have the contrast range of an NTSC TV.  This is especially true of
>>>> LCD monitors.  When watching TV or even DVDs on computers, I've often
>>>> had to choose between washing out the highlights or having the dark
>>>> areas disappear.
>>> I think that's more the LCD. AFAIK, you still can't get blacker than
>>> black on LCDs. Can you?
>> Well there is "reference black" and there is "blanking".
>> With analog NTSC video reference black is technically 7.5 IRE units,
>> while blanking is 0 IRE.
>> It has, however, become common for some video to go "blacker than
>> black", meaning below 7.5 units.
> Some video source goes blacker than black, but can LCDs reproduce this?
> I was under the impression that CRTs have a wider range than LCDs.
I believe that is correct, CRTs have a wider dynamic range of brightness 
than LCDs or Plasma monitors.

But that doesn't change the fact that you should set the blackest black 
the monitor can reproduce to the blackest black that the video signal 
can ask for.


More information about the mythtv-users mailing list