[opendtv] Re: Definition of Anamorphic
- From: Mark Schubin <TVMark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 06 Oct 2009 16:36:45 -0400
Manfredi, Albert E wrote:
I believe that DVDs are encoded as 720 X 480, at least in Region 1. That
translates to 1.5:1 aspect ratio.
No. That translates to a horizontal-to-vertical active sample ratio of
1.5:1.
An aspect ratio is the shape of the picture, period.
As for the term "square pixels," I urge a look at Alvy Ray Smith's Tech
Memo #6:
http://www.alvyray.com/memos/6_pixel.pdf
FYI, when an anamorphic lens is used on film, there is greater vertical
resolution in the displayed image than horizontal.
TTFN,
Mark
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