sane-canon(5)             (11 Jul 2008)             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(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 con-
          sider it extremely unlikely) that your scanner will be dam-
          aged.

          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 deter-
          mine 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

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

          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/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 ver-
               bosity 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)

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