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

sane-pint(5)			       File Formats Manual			     sane-pint(5)

       sane-pint - SANE backend for scanners that use the PINT device driver

       The  sane-pint  library	implements a SANE (Scanner Access Now Easy) backend that provides
       generic access to hand-held and flatbed scanners using the PINT (PINT Is Not Twain) device
       driver.	The PINT driver is being actively developed on the OpenBSD platform, and has been
       ported to a few other *nix-like operating systems.

       PINT is designed to provide an ioctl(2) interface to many different scanner  types.   How-
       ever,  this  backend has only been tested with flatbed single-pass scanners, and more work
       will probably be required to get it to use other scanner types successfully.

       If have successfully used the PINT driver with your scanner, but it does  not  work  using
       this SANE backend, please let us know.  To do this, send a mail with the relevant informa-
       tion   for    your    scanner	to    sane-devel@mostang.com.	  Have	  a    look    at
       http://www.mostang.com/sane/mail.html concerning subscription to sane-devel.

       This backend expects device names of the form:


       Where  special  is the UNIX path-name for the special device that corresponds to the scan-
       ner.  The special device name must be a PINT device or a symlink to such  a  device.   For
       example, under NetBSD or OpenBSD, such a device name could be /dev/ss0 or /dev/scan0.

       The  contents  of  the  pint.conf.  file is a list of device names that correspond to PINT
       scanners.  Empty lines and lines starting with a hash mark (#) are ignored.  A sample con-
       figuration file is shown below:

	      # this is a comment

	      The backend configuration file (see also description of SANE_CONFIG_DIR below).

	      The static library implementing this backend.

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

	      This environment variable specifies the list of directories that	may  contain  the
	      configuration  file.   Under  UNIX, the directories are separated by a colon (`:'),
	      under OS/2, they are separated by a semi-colon (`;').  If this variable is not set,
	      the  configuration  file is searched in two default directories: first, the current
	      working directory (".") and then in /etc/sane.d.	If the value of  the  environment
	      variable	ends with the directory separator character, then the default directories
	      are searched after the explicitly  specified  directories.   For	example,  setting
	      SANE_CONFIG_DIR  to  "/tmp/config:"  would result in directories "tmp/config", ".",
	      and "/etc/sane.d" being searched (in this order).

	      If the library was compiled with debug support enabled, this  environment  variable
	      controls the debug level for this backend.  E.g., a value of 128 requests all debug
	      output to be printed.  Smaller levels reduce verbosity.


       Gordon Matzigkeit, adapted from existing backends written by David Mosberger.

       There are minor roundoff errors when adjusting the ranges, since PINT uses units of 1/1200
       of  an  inch,  and  SANE  normally  uses millimeters.  Symptoms of these errors are skewed
       images.	This should really be fixed (no pun intended) as soon as  possible,  but  I  just
       don't  know/care  enough  about	fixed-point representation and roundoff errors to do this
       correctly.  Workaround: use inches as the scanning  unit,  and  everything  usually  works

       The  PINT  0.5e interface does not provide a way to determine valid ranges for DPI, modes,
       and scan sizes.	So, the SANE backend queries the PINT device, and  dynamically	discovers
       valid  ranges  by  doing a binary search.  This means that the driver takes longer to ini-
       tialize than seems necessary.

       Resetting the scanner does not seem to work (at least not on my HP ScanJet 4p).	For  that
       reason, the driver sends a SCIOCRESTART, then gobbles up any remaining input until it hits

       Not all of the scanners have been identified (i.e. whether they are flatbed or handheld).

       X and Y resolutions are assumed to be the same.

       No testing has been done on three-pass or handheld scanners, or	with  Automatic  Document
       Feeder support.

					   13 May 1998				     sane-pint(5)

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