21 Apr
2005
21 Apr
'05
8:43 a.m.
Jim Leonard wrote:
Depends on the scanner. Mine is optical 1200x2400 and
cost $200, it
handles fiche just fine. I just put a white sheet of paper behind it
before I start scanning.
CORRECTION: Filmstrip, not microfiche. My apologies.
So what *is* enough? The last microfiche I read at my local library was 12
pages by 16 pages on a 4"x6" film, so we have roughly (12/4)*(16/6)=8 pages per
inch of film. 150 DPI is the absolute bare minimum for a readable page, so a
scanner would need a minimum resolution of (150*8)=1200 DPI just to get
something discernable. A better bet is 2400 DPI for easily readable text, and
4800 DPI if you want to be able to make out line drawings. So it *is* possible
with a consumer scanner of 2400 DPI optical or greater -- just make sure, as
someone else earlier already wrote, that it is a true 2400, and not 1200x4800
(ie rectangular pixels).
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
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