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sane-pint(5)		 SANE Scanner Access Now Easy		  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) back‐
       end 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.  However, 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 information for  your  scanner  to	 sane-	 Have	a   look  at  http://www.sane- 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	corre‐
       sponds  to  the scanner.	 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 configuration 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 config‐
	      uration  file is searched in two default directories: first, the
	      current	working	  directory   (".")   and   then   in	 /sys‐
	      tem/resources/sane-backends/1.0.18/etc/sane.d.   If the value of
	      the environment variable ends with the directory separator char‐
	      acter,  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	 "/system/resources/sane-back‐
	      ends/1.0.18/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 Mos‐

       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 fine.

       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  initialize
       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 EOF.

       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.

sane-backends 1.0.18		  13 May 1998			  sane-pint(5)

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