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 and sane-canon630u 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 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 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 may require manual removal of blue
       discoloration.

FILES

       /usr/lib/arch_triplet/sane/libsane-canon.a
              The static library implementing this backend.

       /usr/lib/arch_triplet/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)