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sane-avision(5)		 SANE Scanner Access Now Easy	       sane-avision(5)

NAME
       sane-avision  - SANE backend for original Avision and Avision OEM scan‐
       ners (HP, Minolta, Mitsubishi, UMAX and possibly more) flatbed and film
       scanners.

ABOUT THIS FILE
       This  file  is  a short descripton for the avision-backend shipped with
       SANE.

DESCRIPTION
       The sane-avision library implements a SANE (Scanner  Access  Now	 Easy)
       backend	that  provides access to various Avision scanners and the Avi‐
       sion OEM scanners labelled by HP, Minolta, Mitsubishi or Fujitsu.

       It is fully big-endian aware and in every-day use on PowerPC and	 SPARC
       systems.

       I  suggest  you	hold one hand on the power-button of the scanner while
       you try the first scans - especially with film-scanners!

CONFIGURATION
       The configuration file for this	backend	 resides  in  /etc/sane.d/avi‐
       sion.conf.

       Its  contents  is a list of device names that correspond to Avision and
       Avision compatible scanners and backend-options. Empty lines and	 lines
       starting	 with a hash mark (#) are ignored. A sample configuration file
       is shown below:

	# this is a comment

	option force-a4
	option force-a3
	option disable-gamma-table
	option disable-calibration

	#scsi Vendor Model Type Bus Channel ID LUN
	scsi AVISION
	scsi HP
	scsi /dev/scanner
	usb 0x03f0 0x0701

       force-a4:
	      Forces the backend to overwrite the scanable  area  returned  by
	      the  scanner  to	ISO A4. Scanner that are known to return bogus
	      data are marked in the backend so if you need this option please
	      report this to the backend maintainer. USE WITH CARE!

       force-a3:
	      Forces  the  backend  to overwrite the scanable area returned by
	      the scanner to ISO A3. Scanner that are known  to	 return	 bogus
	      data are marked in the backend so if you need this option please
	      report this to the backend maintainer. USE WITH CARE!

       disable-gamma-table:
	      Disables the usage of the scanner's gamma-table. You  might  try
	      this if your scans hang or only produces random garbage.

       disable-calibration:
	      Disables	the scanner's color calibration. You might try this if
	      your scans hang or only produces random garbage.

       Note:  Any option above modifies the default code-flow for  your	 scan‐
	      ner. The options should only be used when you encounter problems
	      with the default be- haviour of the backend. Please  report  the
	      need  of	options	 to  the  backend-author so the backend can be
	      fixed as soon as possible.

DEVICE NAMES
       This backend expects device names of the form:

	      scsi scsi-spec

	      usb usb-spec

       Where scsi-spec is the path-name to a special device or a device ID for
       the  device that corresponds to a SCSI scanner. The special device name
       must be a generic SCSI device or a symlink to such a device, for	 exam‐
       ple on Linux "/dev/sga" or "/dev/sg0". The device ID is the ID returned
       by the scanner, for example "HP" or  "AVISION".	See  sane-scsi(5)  for
       details.

       Note:  Since  the  backend  now	includes  native  USB access, it is no
	      longer needed - even considered obsolete - to access USB scanner
	      via  the	SCSI  emulation (named hpusbscsi on Linux) for Avision
	      USB devices such as the HP 53xx, HP 74xx or  Minolta  film-scan‐
	      ners.

       usb-spec is the USB device name, the vendor/product ID pair or the name
       used by libusb corresponding to the USB scanner.	 For  example  "0x03f0
       0x0701" or "libusb:002:003". See sane-usb(5) for details.

       The program sane-find-scanner helps to find out the correct scsi or usb
       device name.

       A list with supported devices is built into the avision backend so nor‐
       mally specifying an ID should not be necessary.

FILES
       /etc/sane.d/avision.conf
	      The   backend   configuration  file  (see	 also  description  of
	      SANE_CONFIG_DIR below).

       /usr/lib/sane/libsane-avision.a
	      The static library implementing this backend.

       /usr/lib/sane/libsane-avision.so
	      The shared library implementing this backend (present on systems
	      that support dynamic loading).

ENVIRONMENT
       SANE_CONFIG_DIR
	      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 /etc/sane.d.	If the
	      value  of the environment variable ends with the directory sepa‐
	      rator 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).

       SANE_DEBUG_AVISION
	      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.  The
	      debug  level  7  is the author's prefered value to debug backend
	      problems.

	      Example: export SANE_DEBUG_AVISION=7

SEE ALSO
       sane(7), sane-scsi(5), sane-usb(5)
       http://www.exactcode.de/oss/avision/

AUTHOR
       René Rebe and Meino Christian Cramer

				  11 Jul 2008		       sane-avision(5)
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