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# sane-canon.5

    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)

    sane-backends 1.0.12-cvs          03 May 2001                    sane-canon(5)