21 Apr
2005
21 Apr
'05
3:14 p.m.
On Apr 21 2005, 16:50, Jim Leonard wrote:
still
Pete Turnbull wrote:
> Um, your maths is off. Assuming 150 dpi is the minimum acceptable
for
> well-printed text (and some DEC fiche is anything
but), and a page
is
> 8" wide, you need 1200 dots per page width.
A page width on the
fiche
you describe
is 6/16 inches, so you need 16/6 * 1200 dots per inch,
which is 3192 dpi.
My apologies. Still, 4800 optical scanners are $600 or less, so I consider it possible.
I won't argue with that. Another thing that occurs to me is that one
could presumably build something like a fiche viewer over the scanner
glass; somthing to hold the fiche against a lens and project a
magnified image onto the scanner glass. I assume that, in essence, is
how Al's big fiche scanner works.
--
Pete Peter Turnbull
Network Manager
University of York