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Posted by M.I.5 on 01/18/07 08:24
"Barry Watzman" <WatzmanNOSPAM@neo.rr.com> wrote in message
news:45ae3543$0$4876$4c368faf@roadrunner.com...
> Re: "overscan is an "attribute" of CRTs"
>
> No, wrong. All rear projection displays overscan at least slightly, even
> if they are digital (this includes LCD and LCoS projection, as well as
> DMD). In fact, overscan is effectively required by law (the law doesn't
> actually require overscan, but it does require that the picture totally
> fill the screen. It's an artifact going back to the 1950's and the days
> of small round picture tubes, but it's still on the books). On a rear
> projection set, regardless of the source of the projected image, the only
> way to assure this is to slightly overscan the screen). There is not such
> explicit control of the optics and the magnification ratio that the
> projected digital display can be made to just exactly fill the screen, so
> a slight amount of overscan is used .... the entire resolution (say
> 1920x1080) is generated, but it's projected onto the viewing screen with a
> very slight amount of overscan so that the screen is assured to be filled
> on every single set coming off the production line.
>
> [In fact, digital displays using three-element LCD and LCoS even still
> have convergence adjustments to overlap the 3 image elements exactly.]
>
> The only sets that don't overscan at all are direct view digital displays,
> e.g. direct view (not projection) LCD and plasma.
>
That's actually not quite true Barry. They actually still do lose a small
border area (for picture type video sources such as DVD). The only time
they don't do it, is when showing video generated by a computer.
There is a very good illustration of this if you can get your hands on a
copy of Buster Keaton's, The General in it's region 1 version. Apart from
being a great film, if you play it on your chosen DVD video player onto a
Plasma or LCD display, you will, well, get to watch a great film. But
couple your PC's output to the display, and play it on the PC and repeat the
exercise. The film material is almost wholy contained in the 'protected
area' (because otherwise some of the subtitles would be lost) . The grey
border is the area that is masked off when the normal video input is
received.
Other region versions are probably the same, but I haven't personally tried
them.
>
> MassiveProng wrote:
>> On Wed, 17 Jan 2007 08:20:08 -0000, "M.I.5?"
>> <no.one@no.where.NO_SPAM.co.uk> Gave us:
>>
>>> "Richard C." <post-age@spamcop.net> wrote in message
>>> news:TrmdnX9zEfhh5jDYnZ2dnUVZ_ruknZ2d@comcast.com...
>>>> "MassiveProng" <MassiveProng@thebarattheendoftheuniverse.org> wrote in
>>>> message news:5dtqq2dt1c2krp8gpgblmnc1h1ujf76q6u@4ax.com...
>>>>> On Tue, 16 Jan 2007 19:30:26 +0100, Martin Heffels
>>>>> <twentyfourthof@november.edu> Gave us:
>>>>>
>>>>>> On Tue, 16 Jan 2007 09:33:21 -0800, "Richard C."
>>>>>> <post-age@spamcop.net>
>>>>>> wrote:
>>>>>>
>>>>>>> top, top, top!
>>>>>> Can you please keep this off-topic chat about top and bottom posting,
>>>>>> in the group where you lot usually hang out? Thanks heaps :-)
>>>>> FIND the original poster of this utter CRAP, and jump on HIS ass,
>>>>> disphit.
>>>> ===============================
>>>> That would be YOU, asshole!
>>>> YOU are the one who keeps starting things about top posting.
>>>> What a putz!
>>>> ==========================
>>> Certainly was. I even checked back.
>> Liar. You didn't filter me any more than you did Zyber after you
>> declared a plonk on him. You filter tards are a piece of work.
>>
>> You are just too fucking wussified to respond.
>>
>> Also, the twit was talking about the number of groups crossposted
>> to, not just the top posting rant, so fuck off. You can't even
>> interpret modern video, so we could in no way expect your retarded ass
>> to be able to read Usenet, particularly when you lie about filtering.
>> What a wuss you are.
>>
>> HDMI is a digital interface, disphit, and overscan is an "attribute"
>> of CRTs, but I don't expect a twit that thinks his standard DVDs are
>> going to look great on an HD display to understand.
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