[mythtv-users] New 50" Plasma, setting Myth for it?
Simon Hobson
linux at thehobsons.co.uk
Tue Oct 20 18:03:22 UTC 2009
Jean-Yves Avenard wrote:
> > Hmm, the more I'm finding out about this HD stuff (and HDMI), the less
>> impressed I'm getting. Unless I'm missing something, the 'standards' result
>> in you playing a DVD (for example) and the DVD player images the video at
>> (say) 1366x768. Your TV then takes this image and re-scales it to introduce
>> overscan - even though it's panel has a native resolution of 1366x768.
>
>Since when does a TV upscale to "introduce" overscan ?
>
>where is that coming from ?
Take one 26" TV, hook up a computer with DVI (via an HDMI port), and
set computer to 1366x768 (or more likely 1360x768). I gather that on
most 26" sets won't have an option for 1:1 mapping between input and
display pixels (aka full pixel mode) and will therefore :
chop off the outside of your image leaving less than 1366x768 pixels,
and then re-scale the smaller image left to fit on the 1366x768 panel.
Thus, on a set that doesn't have full pixel mode, you cannot display
an image that has not been re-scaled by the TV. That might not matter
too much on action material, but it makes reading text on a computer
desktop look pretty horrible.
That's using a digital input. VGA is better (if you can get closer
than 1280x768), but starting with digital, converting it to analogue
to pipe it down a bit of wire, and then converting it back to digital
again seems rather stone age to me.
Josh White wrote:
>Why would you by a TV for use as a monitor? You can get a 26"
>monitor for much less than a 26" TV (at least at the Best Buy I was
>in last weekend in central NY), and aviod the trouble with the "HD
>stuff" in general.
But they have ridiculously high resolutions - 40% more than on a 26"
TV. The reason I'm specifically looking at TVs and not monitors is so
that I can get a large display & relatively low resolution without
all the artifacts that result from running an LCD panel at other than
it's native resolution. Yes, I had considered monitors - and if they
didn't look (relatively) crap at lower resolutions then that's what
I'd have done ages ago (actually it would have just been a new iMac).
Since my mother's eyesight is getting poor, the image has to be very
clear to start with. Before I borrowed a 26" TV she was talking about
giving up.
Mike Perkins wrote:
>Buy a TV/monitor which has a VGA input - then you can treat it as a
>monitor. No overscan, just fake up a mode line which matches the
>exact resolution of the hardware, and you're good to go. Although -
>occasionally the EDID sent out by the TV lies, so be prepared to
>dump it and use your own.
Well I'll be giving it a go, but the only TV I've had available so
far seems very happy to just flash up a message about "unsupported
mode" and turn off. My new one arrived today, so I'll be having a
fiddle tomorrow evening.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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