sane-canon(5)            SANE Scanner Access Now Easy            sane-canon(5)



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

       /usr/local/lib/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)
