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

       @LIBDIR@/libsane-canon.a
              The static library implementing this backend.

       @LIBDIR@/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)

@PACKAGEVERSION@                                   11 Jul 2008                                     sane-canon(5)