Dwight:
All good advice so far.
However, I would recommend going to 300 dpi bi-tonal, because the trend now
is to provide content based searching, and the OCR will just work better
with the extra density. On grey scale you may be able to go with less
density. The newer microfilm scanners will identify the frame, so your
images will be properly selected. My research says that G4 Fax compressed
bi-tonal TIFF is approximately 50 K at 200 dpi, 70 at 300 dpi, so the size
difference isn't as bad as you might think.
Image enhancement to adjust contrast in the scans will be invaluable for the
older or poorer film. And may make grey scale unnecessary.
Indexing the documents from film can be a challenge -- what do you have to
start? Is it anything more than date ranges and maybe sorted by document
type? You may need post-scan auto-classification and indexing.
If you contact me offline, I can give you a few PNW names to send any RFQ
to.
Best of luck -- this is going to be a big project.
Bernard Chester, CDIA+, ICP, EDP
Principal Consultant
IMERGE Consulting, Pacific Northwest Office
7683 SE 27 Street, #316
Mercer Island, WA, 98040
Office: 206-230-9253; Mobile: 206-979-7389
-----Original Message-----
From: Records Management Program [mailto:[log in to unmask]] On Behalf
Of WALLIS Dwight D
Sent: Wednesday, March 17, 2010 11:01 AM
To: [log in to unmask]
Subject: Converting Microforms to Digital Images
Hi, folks - we are looking at the conversion of a fairly large amount of
16mm and 35mm microfilm, as well as 105mm microfiche to TIFF images.
I've found some good examples of specifications on the internet, for
example, from the Library of Congress. Outside of our microfiche - which
is fairly consistent COM - I anticipate film quality that varies
considerably in density, splicing practices, and reduction ratio. The
office I am facilitating this for wants to send out only their diazo
copies for scanning. We are looking at negative > positive scans, mostly
bi-tonal, but with some potential gray scale issues as well (I'm not
entirely sure what we are scanning yet, but believe some of it is
hand-written).
I prefer to send out the diazos myself, but wonder what kinds of quality
issues we might encounter in doing so. Is there anyone who can comment
on this, or perhaps point me to any standards or guidelines on the
subject?
Also, if you have sent out silver originals for scanning outside of your
immediate geographic area, what kind of shipping/insurance arrangements
did you make? Or, is this simply too risky?
Dwight Wallis, CRM
Records Administrator
Multnomah County Records Management Program
1620 SE 190th Avenue
Gresham, OR 97233
phone: (503)988-3741
fax: (503)988-3754
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