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RedHat 9 (Linux i386) - man page for sane-canon (redhat section 5)

sane-canon(5)									    sane-canon(5)

       sane-canon - SANE backend for Canon SCSI scanners

       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 FS2700F
	      CanoScan FS2710

       No parallel port and USB scanners are supported and there are no plans to support them  in
       the future.

       IMPORTANT:  this  is  alpha  code. Don't expect this to work correctly. Many functions are
       missing, others contain errors. In some cases, your computer might even hang. It cannot be
       excluded (although I consider it extremely unprobable) 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  contact  Mitsuru  Okaniwa   <m-
       okaniwa@bea.hi-ho.ne.jp>, for the FS2710 Ulrich Deiters <ukd@xenon.pc.uni-koeln.de>.

TIPS (FS2700)
       Scanning  either  slides or negatives has been found to require rather large gamma correc-
       tions of about 2.2 to 2.4 (same value for red, green, and blue). Also, for  slides,  using
       "Auto Exposure" helps a lot.

       The  "Auto  Exposure" function for slides makes the scanner do a first pass on the film to
       determine the Highlight and Shadow point values. The "Auto Focus"  function  triggers  yet
       another pass to determine the focus value. After that, the real scanning pass takes place.
       The "Auto Exposure" function is not available for negatives yet.

       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.
       It is likely that a sharpen filter will be included in a future version of this backend.

       The "native" scanner resolutions of the 2700F are the integer sub-multiples of  2720  dpi,
       i.e.  1360, 680, 340 and 170. Scanning at other resolutions is possible, but there will be
       noticeably more jaggies in the image than when using one of the "native" resolutions.

TIPS (FS2710)
       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  2.5.	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

	      The static library implementing this backend.

	      The shared library implementing this  backend  (present  on  systems  that  support
	      dynamic loading).

	      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

       doc/canon.install2700F.txt (installation of a CanoScan 2700F

       Helmut  Koeberle,  Manuel  Panea,  and Markus Mertinat; FB620S support by Mitsuru Okaniwa;
       FS2710 support by Ulrich Deiters
       Man page by Henning Meier-Geinitz (mostly based on canon.README)

					   03 May 2001				    sane-canon(5)

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