Path: utzoo!utgpu!watmath!onfcanim!dave
From: dave@onfcanim.UUCP (Dave Martindale)
Newsgroups: comp.graphics
Subject: Re: ShowScan quality image bit rate
Message-ID: <17349@onfcanim.UUCP>
Date: 1 Feb 89 18:20:16 GMT
References: <EXtZ8Fy00VoBMI6VQ2@andrew.cmu.edu> <18071@glacier.STANFORD.EDU>
Reply-To: dave@onfcanim.UUCP (Dave Martindale)
Organization: National Film Board / Office national du film, Montreal
Lines: 17

In article <18071@glacier.STANFORD.EDU> jbn@glacier.UUCP (John B. Nagle) writes:
>
>	Consider 6000 x 8000 pixels x 60frames/sec x 24 bits/pixel;
>the data rate is about 70 gigabits/sec, not a number in the terabit
>range as I previously posted.  

Showscan's aspect ratio is about 2.3, not 1.33.  If we keep the horizontal
resolution of 8000, the vertical resolution would be 3500, not 6000.  So
it's only 40 Gbit.

Also 8000 pixels is 4000 line pairs over 2.072 inches, which is 76 lp/mm.
I would be surprised if a Showscan showed this high a resolution on-screen.
You might be able to be visually "as good as Showscan" with as low as 40
lp/mm, which reduces the bit rate to only 11 Gbit/sec.

Magnetic storage media have a long way to go before they can touch the
information rate of a film projector....