bkirby@cs.umr.edu (Bill Kirby) (06/19/91)
Before you read the following (possibly stupid) question, keep in mind that I know NOTHING about handheld scanners. :-) I need to scan x-rays (lit from behind). Can a handheld scanner do this? If this is not the appropriate group, please enlighten me as to where I should post it. Thanks, +--------------------------+-----------------------------------------------+ | Bill Kirby | Internet: bkirby@cs.umr.edu | | Computer Science Dept. | Bitnet: bkirby%cs.umr.edu@umrvmb.bitnet | | University of MO - Rolla | UUCP: ...!uunet!cs.umr.edu!bkirby | +--------------------------+-----------------------------------------------+
simon@sco.COM (Simon Tooke) (06/21/91)
From: bkirby@cs.umr.edu (Bill Kirby)
> I need to scan x-rays (lit from behind). Can a handheld scanner do this?
In a related vein, I (with my handheld scanner) have been trying to
scan black&white negatives with limited success. The problems are
the same, and no matter what I do, I get much better results (more clear
and more grey levels) scanning a contact print of the negative.
Here is what I have noticed so far:
1) Scanning on a lightbox doesn't work if the light is flourescent(sp.)
I have not tried backlighting with incandescent(sp.? again?)
lighting and suspect incandescent powered by a filtered DC source
to be best. The problem is wavy lines caused by lamp flicker.
2) Scanning with a silvered (or matte-silver) (i.e. either side of a
bit of tinfoil) doesn't work. I had high hopes for this, but the
whites are washed down to grey.
3) Best results so far are simply scanning with reflective white paper
behind the negative.
For scanning Xrays, I assume the resolution requirements are less than
I require, since my original is only a 35MM negative. You might have
reasonable luck with white paper.
Anybody else have suggestions? I'm trying to (a) avoid making a contact
sheet, and (b) build up a digital catalogue of my images.
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