Archived from groups: alt.tv.tech.hdtv (
More info?)
nospam@nospam.se (Jan B) wrote in news:42c79554.116619319@wingate:
> On Sat, 2 Jul 2005 17:11:16 -0700, "Richard C."
> <post-age@spamcop.net> wrote:
>
>>X-No-archive: yes
>>
>>"Dave Oldridge" <doldridg@leavethisoutshaw.ca> wrote in message
>>news:Xns9687956E14DA8doldridgsprintca@24.71.223.159...
>>> "Richard C." <post-age@spamcop.net> wrote in
>>> news:RumdnX8Yj7rpLFvfRVn-1w@comcast.com:
>>>
>>>> X-No-archive: yes
>>>>
>>>> "Dave Oldridge" <doldridg@leavethisoutshaw.ca> wrote in message
>>>> news:Xns967DE047449A8doldridgsprintca@24.71.223.159...
>>>>> Baked <baked@nowhere.invalid> wrote in
>>>>> news:78ebd$42ba0174$453de2c1$15643@FUSE.NET:
>>>>>
>>>>>> On Tue, 21 Jun 2005 15:14:34 GMT, Dave Oldridge
>>>>>> <doldridg@leavethisoutshaw.ca> wrote:
>>>>>>
>>>>>>>Moreover the player will size and anamorph
>>>>>>>the non-anamorphic letter-boxed stuff for me.
>>>>>>
>>>>>> LOL!
>>>>>>
>>>>>> Thanks for the laugh of the day.
>>>>>
>>>>> Glad you liked it.
>>>>>
>>>>> Actually, there is quite a bit that can be done on the fly with
>>>>> good MPEG-2 decoding firmware. It will not, of course, add any
>>>>> resolution to what's on the DVD, but it can enable you to display
>>>>> it better. By taking a letter-boxed image (e.g. the 16:9 image of
>>>>> the Buffy episode "Once More with Feeling" -- the only episode so
>>>>> filmed) and sending it anamorphed to 4:3 (clipping the black
>>>>> letter-box bars) to my TV as an anamorphed 480p signal, I can set
>>>>> the TV to 16:9 full screen to display the result full screen.
>>>>> Without the feature I'd have to watch it letter-boxed with the TV
>>>>> in 4:3 mode. Do you understand the difference?
>>>>>
>>>>> --
>>>> ===========================
>>>> It is STILL NON-anamorphic and is lower resolution.
>>>> You cannot create picture where none exists.
>>>
>>> Of course not. My point is that the additional flexibility lets ME
>>> decide how to display it and which upconversions to do. That means I
>>> have more choices about how to watch it.
>>>
>>>
>>=======================================
>>But you clearly said:
>>">>>Moreover the player will size and anamorph
>>>>>the non-anamorphic letter-boxed stuff for me."
>>
>>That is totally wrong.
>>=====================================
>
> It seems the difference in opinion is more a semantic issue ...
>
> To my understanding, the wording anamorph comes from the solution for
> film that use anamorphic lenses to distribute a wider aspect ratio in
> the film frames (because the same film is used.)
> An anamorphic lens gives different magnification horizontally and
> vertically.
>
> For electronic distribution we have to know when displaying in what
> aspect ratio the signal shall be "projected". That is true both for
> the older 4:3 standard and newer 16:9, and true whether the transfer
> is analogue or digital. The 4:3 SD signal of TV or DVD is from the
> start defined with non-square pixels.
>
> There is no principle difference in the signal type when the signal is
> resampled to fit another resolution and aspect standard.
> Of course the aspect ratio of the pixels are changed, and that is what
> can be compared to the anamorphic process in film.
>
> On the other hand none of these signals are more "anamorphic" then the
> other. (If anything, the HDTV signals with square pixels could be
> regarded "non-anamorphic".)
>
> The process should be called resampling.
That is what is happening.
>
> I understand the trick here to be that this particular DVD player can
> do zoom and resample on a 4:3 signal with letterboxed 16:9 content and
> put it out resampled as a 16:9 1080i signal.
Actually, it puts out the middle 2/3 of the image as a resampled 16:9
480p signal, which my TV can display the same way it displays a truly
anamorphed DVD. It's not as good as playing a truly anamorphed DVD, but
it's better than playing the non-anamorphed DVD straight up in 4:3 with
120 lines of TV scan being wasted on black every frame.
> If that is better than having the TV do the zoom and resampling
> depends on the player and the TV. If the TV resamples the signal again
> it could be better not to resample the signal twice.
Most HDTV sets resample 480i and 480p signals. The DVD player just gives
me a choice about how and where. And my TV will not zoom anything on its
component inputs unless it's 480i (Yeeeechhh!) so the zoom in the DVD is
very convenient.
--
Dave Oldridge+
ICQ 1800667
A false witness is worse than no witness at all.
God is an evolutionist.
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