home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!news.gtech.com!noc.near.net!hri.com!ukma!nsisrv!kong!joe.gsfc.nasa.gov!jonke
- From: jonke@kong.gsfc.nasa.gov (Stephen Jonke)
- Newsgroups: rec.video.releases
- Subject: Re: Aspect Ratio for 7 popular films (Laserdiscs)
- Message-ID: <1992Dec21.213205.24607@kong.gsfc.nasa.gov>
- Date: 21 Dec 92 21:32:05 GMT
- References: <ypq2gdl@rpi.edu>
- Sender: news@kong.gsfc.nasa.gov
- Organization: NASA Goddard Space Flight Center
- Lines: 28
- X-Xxmessage-Id: <A75BA20103035C5D@joe.gsfc.nasa.gov>
- X-Xxdate: Mon, 21 Dec 92 21:32:01 GMT
- Nntp-Posting-Host: joe.gsfc.nasa.gov
- X-Useragent: Nuntius v1.1.1d12
-
- In article <1992Dec21.215958.16790@uts.uni-c.dk> Hans O. Nymand,
- idathon@uts.uni-c.dk writes:
- >You say your TV is a ratio 1.375:1. I thought TV's generally was 1.33:1.
-
- 1.375:1 is Academy ratio. TV screens are 1.33:1.
-
- You can't accurately measure a letterboxed movies aspect ratio on a TV screen
- because of at least three reasons:
-
- - overscanning. Most TVs crop all four sides of the image pretty badly --
- even if you adjust your TV to show all of the "safe area" it is still cropped
- when you talk about the raw image as a whole and tapes/discs go well beyond
- this area. At least on my TV set it is not possible to completely rid the
- thing of overscanning -- they image starts getting really screwed up at the
- extreme edges.
-
- - distortion. No tube TV is distortion free. If you display a hatch pattern
- on a tube TV, the width of the "squares" will be different at the center of
- the screen then it is at the edges.
-
- - transfer accuracy. At least in a few cases movies have been transfered at
- the wrong ratio, especially tending to not give the full width. Apocolypse
- Now is one such example.
-
- Steve
- ------------------------
- jonke@kong.gsfc.nasa.gov
- ------------------------
-