[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: VB: Film for DVD
- To: telecine at alegria.com
- Subject: Re: VB: Film for DVD
- From: "John Sprung"<John_Sprung at Paramount.Com>
- Date: Tue, 11 Aug 1998 20:15:23 -0700
- Resent-Date: Tue, 11 Aug 1998 20:20:22 -0700
- Resent-From: telecine at alegria.com
- Resent-Message-ID: <"9mlBU.A.N7.FnQ01" at sun>
- Resent-Sender: SmartList account <slist at sun.alegria.com>
- Resent-To: multiple recipients of <telecine at alegria.com>
Ron Martin wrote:
>The real killer in DVD land is that it is a 4:2:0 vertical
>compression scheme so any real advanage of progressive vs.
>interlace is gone in the compression pass.
No, 4:2:0 is a perfectly reasonable thing to do in
progressive. Progressive always inherently gives you equal horizontal
and vertical luminance resolution. With 4:2:2 in
progressive, you have twice as much vertical chroma
resolution as horizontal chroma resolution. 4:2:0 gives you
equal horizontal and vertical chroma res, at half as much as
the luma res. The real bugger is getting 4:2:0 stuff into
interlace, because interlace already threw away the vertical resolution,
so 4:2:0 is a double whammy.
The human eye and brain are very readily fooled by half as
much chroma res as luma res. Were that not true, NTSC
wouldn't have worked. Symmetry between horizontal and
vertical resolutions is generally a good thing.
Thanks to Kodak for support in 1998.
No product marketing allowed on the main TIG. Contact rob at alegria.com
1009 subscribers in 39 countries on Tue Aug 11 20:19:28 PDT 1998
subscribe/unsubscribe with that Subject: to telecine-request at alegria.com
complete information on the TIG website http://www.alegria.com/tig3/