[mythtv-users] OT: LED or Plasma (was Advice on choosing a TV)

Andre mythtv-list at dinkum.org.uk
Thu May 27 10:04:02 UTC 2010

On 27 May 2010, at 09:11, Paul Gardiner wrote:

> Alasdair Macdonald wrote:
>> On 11 May 2010 13:28, Paul Gardiner <lists at glidos.net> wrote:
>>> I want the Plasma, don't I? Tell me I want the Plasma... go on...
>>> go on! :-)
>> Well, the topic came up at the perfect time for me; I've been
>> following it for the past several days, took advice that was offered
>> earlier in the discussion, and have placed my online order (Panasonic
>> TX-P50G20B) just a few minutes ago.
> Are you seeing a lot of posterization from yours in darker images,
> especially on walls and faces? At first I thought it was just the
> TV being larger than I was used to showing up poor sources, but
> I'm seeing it in all sources. Also, if I pause and adjust the
> brightness, the colour bands move, which also indicates that it's
> the TV not the source.

Sounds like you are seeing artefacts of Plasmas reduced colour range, dithering is used to reduce it's effect (at 600hz of course) but sometimes it's insufficient, the display system tries to match posterisation of the display to posterisation in the source material which might explain the shifting on brightness change. You can minimise this by ensuring that brightness and contrast is set correctly on a testcard (BBC HD testcard and setup instructions from Andy Quested's BBC blog are fine), this ensures the video levels are inside the working range, with crts you could always adjust to taste, with all plat panel technologies there is only one correct setting.

Alternatively and much more simply are you using studio levels (vdpaustudio) out from MythTV? If not there is a scaling of the display output 16-235 scaled to 0-255, this introduces some small artefacts that a plasma display will accentuate.

Do you get the same effect when viewing freeview or freesat directly?

Finally have you considered a career in Broadcast TV Engineering ;-)


> It's bad enough that I'm considering
> returning it. Although maybe this is a problem with all modern
> TVs.
> Paul.
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