21 Apr
2005
21 Apr
'05
11:48 a.m.
Jules wrote:
Am I right in thinking that a home flatbed scanner has
absolutely no
hope of providing the resolution needed to scan microfiche?
Generally, yes. There may be some flatbeds that can do it.
The common fiche reductions are 24x, 42x, and 48x. Suppose you want
an effective scan resolution of 300 DPI. That means that you need
a scanner *optical* resolution (not interpolated) of 7200 to 14400
DPI. If you're willing to put up with 200 DPI effective (which is
somewhat marginal), you can get by with 4800 to 9600 DPI.
Al bought a Mekel fiche scanner recently in order to scan his collection
of DEC fiche. The scanner was very difficult to configure, and the
automatic identification of page frames doesn't work too well, so
it is a very tedious process.
Eric