NAME

       sane-canon - SANE backend for Canon SCSI scanners

DESCRIPTION

       The  sane-canon  library implements a SANE (Scanner Access Now Easy) backend that provides
       access to the following Canon flatbed and film scanners:

              CanoScan 300
              CanoScan 600
              CanoScan FB620S
              CanoScan FB1200S
              CanoScan FS2700F
              CanoScan FS2710S

       Parallel port and USB scanners are not supported by this backend; see the manual pages for
       sane-canon_pp(5) and sane-canon630u(5) for further information.

       IMPORTANT:  This  is beta code. We tested the code on the scanners listed above, using the
       computers and operating systems available to us, but we cannot guarantee that the  backend
       will  work  smoothly with future operating systems, SCSI adapters, SANE frontend programs,
       or Canon scanners not contained in the list above. In some cases your computer might  even
       hang.   It  cannot  be  excluded  (although  we  consider it extremely unlikely) that your
       scanner will be damaged.

       That said, TESTERS ARE WELCOME. Send  your  bug  reports  and  comments  to  Manuel  Panea
       <mpd@rzg.mpg.de>;  for  questions concerning the FB620 and FB1200S contact Mitsuru Okaniwa
       <m-okaniwa@bea.hi-ho.ne.jp>, for the FS2710S Ulrich Deiters <ukd@xenon.pc.uni-koeln.de>.

TIPS (FS2700F)

       Scanning either slides  or  negatives  has  been  found  to  require  rather  large  gamma
       corrections  of  about 2.2 to 2.4 (same value for red, green, and blue). It is recommended
       to use the automatic exposure controls of the frontend xsane(1) for best results.

       The "Auto Focus" function triggers a special pass to  determine  the  focus  value.  After
       that, the real scanning pass takes place.

       Even  with "Auto Focus" turned on, the scanned image is often a bit too blurred. Using the
       gimp(1) to  do  a  "Filter->Enhance->Sharpen"  at  about  40  to  60  improves  the  image
       considerably.

TIPS (FS2710S)

       Gamma  corrections are done not by the scanner, but by the backend.  The scanner is always
       run in 12-bit mode. In "color" mode the image data are corrected for gamma, shadow  point,
       etc.,  and  then  truncated to 8-bit intensities; the default gamma value is 2.0. In "raw"
       mode the image data are exported without corrections as 16-bit intensities; this mode  can
       be  recommended if extensive adjustments have to be made to a picture (and if the frontend
       can handle 16-bit intensities).

       Negatives are handled by simple color inversion and will require manual  removal  of  blue
       discoloration.

FILES

       /usr/lib/x86_64-linux-gnu/sane/libsane-canon.a
              The static library implementing this backend.

       /usr/lib/x86_64-linux-gnu/sane/libsane-canon.so
              The  shared  library  implementing  this  backend  (present on systems that support
              dynamic loading).

ENVIRONMENT

       SANE_DEBUG_CANON
              If the library was compiled with debug support enabled, this  environment  variable
              controls  the  debug  level  for  this  backend.  Higher  debug levels increase the
              verbosity of the output.

              Example: export SANE_DEBUG_CANON=4

SEE ALSO

       sane-scsi(5)
       http://www.rzg.mpg.de/~mpd/sane/doc/canon.install2700F.txt  (installation  of  a  CanoScan
       2700F)

AUTHOR

       Helmut Koeberle, Manuel Panea, and Markus Mertinat;
       FB620S and FB1200S support by Mitsuru Okaniwa;
       FS2710S support by Ulrich Deiters
       Man page by Henning Meier-Geinitz (mostly based on canon.README)

                                           11 Jul 2008                              sane-canon(5)