scanning negatives

Hi,

I am going to be scanning several hundred old 70mm 
film rolls (about 100 images per roll), and was 
wondering about which SANE compatible scanner would 
be good to use for this that is not too expensive 
and can do the recommended 2700dpi+ negative 
scanning?  Is the HP Scanjet 3970 a good one?  I 
think it would be good to have the extra infra-red 
channel, like digital-ICE or similar dust removal 
etc.

Also would a homemade transparency light box above 
the scanner work well for negative scanning? 

I would like to make a film spool feeder to 
automatically advance the frames as they are
scanned and then interface this to SANE to
synchronize it all. (maybe receive a signal
from the SANE frontend to trigger the spooler 
each time the scan is complete?)

Is there software that can automatically crop
multiple scanned images?  ie. If I use a black 
cardboard sheet on the scanner glass with cutouts 
for exposing 9 negatives at once (3 film rolls 
spooling at once) then automatically crop and write 
these 9 negatives to files?

I've been trying to figure out the best light source
to use for scanning negatives, I've tried flourescent,
incandescent, a flashlight, a white
lightbox etc but all of the scans look horrible 
so far, with only green colour once I invert them.

cheers,
Jamie




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On Sun, 24 Sep 2006 00:09:02 -0700
Jamie Morken <jmorkenshaw.ca> wrote:

> I've been trying to figure out the best light source
> to use for scanning negatives, I've tried flourescent,
incandescent, a
> flashlight, a white lightbox etc but all of the scans
look horrible 
> so far, with only green colour once I invert them.

Hi Jamie.

This is a very scanner-specific solution, but it worked for
me:

I had hundreds of slides I wanted to scan, before they were
completely
discolored or ruined by the fungus I detected on some of
them. I first
tried several light sources, but quickly realized that 1)
the light
source must be very precisely positioned to be of use, 2)
the spectrum
of the source should be the same as the one in the scanner,
and 3) it
should be fed with DC or high frequency, as AC sources cause
lines.

I made a 'tent'-like structure with two cheap mirrors (5
by 10cm) at 45
degrees to reflect the light of the scanner back down,
experimented a
little tilting the structure till the light went correctly
back. 

Scanned all the slides with quite good results! 

This won't work with the more modern LED-illuminated
scanners, and, I
understand there are some fluorescent scanners that use 3
color tubes -
won't work either. Mine is an old AGFA 1212. Of course,
resolution is
only 1200dpi.

John

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