Three e-mails concerning these issues.
Paul
From: Kirk Martinez <[log in to unmask]>
Subject: For moderation - Re: Greetings, and question on Scanned
Images
my summary to scan resolution and compression/TIFF issues (useful - thanks!)
I can still read tiff files I wrote in 1986 with no problem! If you are
really worried I suggets to write a copy of the raw source code for a
reader on each disk? eg public domain TIFF reader.
Plus the TIFF spec!
Then in 50 years - the migrated code hits someone's desk in an emergency
and they recompile it and can read the files... if they haven't already
migrated to another format.
I bet that works! - but I'm not going to try it.... (hmmm I write LZW
lossless TIFF....)
Kirk
http://www.ecs.soton.ac.uk/~km
From: Kirk Martinez <[log in to unmask]>
RAM and Storage (was: question on
scanned images )
summarising my responses to the RAM storage stuff:
Yes - buy LOTS of RAM for a scanning PC - if you save even 10s per image
that's labour cost which is the dominant cost. Don't go below 64M at all...
and if using photoshop etc try to get at least as much RAM as your image
size (pref times 2!) so 3kx2k=18MB need > 36MB plus OS.
We found using a FAST SCSI disk for your OS swap and pshop swap will also help.
Storage: if you can use CD-R and make multiple copies you will be safe for
10 years at least!
although managing CD-R writes can be a pain - CD-RW means someone can
delete or change something! (and I guess its less long-life)
In projects with the Louvre and National Gallery, CD-R jukeboxes were
great! (from NSM) you just fill up a directory on the hard disk and when
its full - flush it to a CD-R. They now migrate to DVD-RAM - which will
take over this whole area asap. (and is around 4GB/disc)
Tape is OK too - as long as you follow the manufacturer's life
recomendation and migrate/rewrite. We used DATs for 10yrs - 2 copies at a time.
Hope that's useful,
Kirk Martinez
Director of the Centre for Digital Libraries Research
Multimedia Research Group
Dept. of Electronics and Computer Science
University of Southampton, Southampton SO17 1BJ, UK.
tel: +44 (0)2380 594491 fax: 592865 http://www.ecs.soton.ac.uk/~km
From: Jon Roland <[log in to unmask]>
Book page and microfilm
scanners
More to the point, has anyone tried using the HP 6390Cxi scanner or others in
the 6300C series with transparency adapter for scanning microfilm or
microfiche, and if so, what kind of results did you get?
We need solutions using low-cost off-the-shelf scanners.
--Jon
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