# CoolScan LS-1000 gamma

From: f314116@yahoo.com
Date: Mon Nov 27 2000 - 03:20:48 PST

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  Hi,

  First, I am new to this list and to sane, so feel free to point me to the
  obvious.

  Second, a little background about what I am trying to do. When I was young
  my parents and I did a 8 years (1978-1986) long trip around the
  world (in a 41 feet boat). About 3000 slides have been taken, but they
  haven't been stored properly and deteriorate rather fast (moisture [?] on
  most of them). I plan to at least take a digital snapshot of them. I know
  that the color and the quality of the original will be lost, but at least
  something will stay.

  I grabbed a LS-1000 (which is not the best scanner for the job) and made a
  few tests. Unfortunately, it looks like gamma correction is not supported
  from sane. I spent a couple of hours hacking the sources of the backend
  yesterday, and it looks like gamma was suported but get losts in various
  changes for the other scanners.

  So, the real questions:

  1/ Can I find detailed specs of LS-1000 (in particular, the SCSI
  commands it supports) ?

  2/ I _think_ I have read somewhere that the LS-1000 is 12 bits
  internally. Am I right to beleive that there must be a way to send a 4096
  entries Look Up Table to the scanner before the scan ?

  3/ Can someone explain me what a pre-scan is (I guess that it is a pass
  over the slide that the firmware of the scanner uses to set various scan
  parameters to reasonable values) ?

  4/ I plan to do a little tool that do "autofocus + low-res scan + compute
  black/white point + create a LUT table with user-defined gamma + scan
  the slide" as a poor man batch scanner. Would it be usefull ?

  5/ I plan to buy a LS-2000 before doing te real scans. Do the infra-red
  correction functions of the 2000 are correctly handled by sane ?

  Sorry for the long mail, thanks in advance for any reply

  Cheers,

  --fred

  [Frederic.Stark@wanadoo.fr ; stark@easynet.fr ; f314116@yahoo.com]

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