On Mon, 16 Mar 1998 01:15:59, -0500, JNVS44B@xxxxxxxxxxx (MR THOMAS N
CURLEE) wrote:
>Some crude back-of-the-envelope calculations for resolution needed
>for digital cameras.
>
>Assuming 100 lines/mm needed (about what reasonably good film
>resolves):
>
>With 25.4 mm/inch, then a 35 mm frame is 25.4 X 100 by 1.5 X 25.4 X
>100. This is 9.68 million pixels. With 30 bits per pixel (assume 4
>bytes) this is 38.7 MB per photo. Note that many cam corders
>advertise 300K-400K pixel resolution. Without image compression wee
>would need a 1.4 GB hard drive to store a 36 exposure 'roll'.
>
>Just a thought about how far we need to go before film will go away.
>
>Tom Curlee
>
And another important thing: lifetime.
How will different media deteriorate with time?
All my estimates are -very- rough.
Paper, also paper pictures, will live for a century, maybe two, at
least
Color and b/w negatives will have roughly the same lifetime, maybe
longer.
Magnetic media (floppies, hard diks, tapes) don't survive more than
5-10 years at maximum. After that (or much better before that) you
will have to rewrite them, maybe to new media. And again. And again.
Maybe the CD will behave better, but that is still uncertain. In
particular the oxidation process of the aluminium layer in the CD is a
very uncertain factor here.
Anyway, this is another reason why IMHO film will remain for a long
time yet.
Frank van Lindert
Utrecht - NL
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