Also I went through all changes made between 1.0.25 and 1.0.27 with
regards to genesys in general and more specifically gl847 (which is the
chip CanoScan LiDE 100 is using) looking for anything related to colour.
The only thing I was able to find was this patch changing reallocation
of gamma tables: https://anonscm.debian.org/cgit/sane/sane-
backends.git/commit/backend/genesys.c?id=5edb87f9ac950473f8c3a57b4071c970887d8440

I'm no expert but this sounds promising and it's the best I can provide
helping to fix this bug.

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https://bugs.launchpad.net/bugs/1731459

Title:
  On Ubuntu 17.10 genesys_gl847 scanners produce a black band in scanned
  images.

Status in sane-backends package in Ubuntu:
  Confirmed

Bug description:
  On Windows it works but on my Ubuntu 17.10 I see a black band on
  scanned image. The scanner is Canon CanoScan LIDE100. Libsane version
  is 1.0.27-1~experimental2ubuntu1

To manage notifications about this bug go to:
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