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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 description 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   /usr/lo-
       cal/etc/sane.d/avision.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 skip-adf
	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!

       skip-adf:
	      Forces the backend to ignore an inconsistent ADF status returned
	      by the scanner (ADF not present, but ADF model number non-zero).
	      Without this option, the backend will make several  attempts  to
	      reset  the  ADF  and retry the query in this situation, and will
	      fail with	a "not supported" error	if the ADF still  doesn't  re-
	      spond.

       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 de-
       tails.

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

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

       /usr/local/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  /usr/lo-
	      cal/etc/sane.d.  If the value of the environment	variable  ends
	      with  the	directory separator character, then the	default	direc-
	      tories are searched after	the explicitly specified  directories.
	      For example, setting SANE_CONFIG_DIR to "/tmp/config:" would re-
	      sult   in	  directories	"tmp/config",	".",   and   "/usr/lo-
	      cal/etc/sane.d" being searched (in this order).

       SANE_DEBUG_AVISION
	      If the library was compiled with debug support enabled, this en-
	      vironment	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 preferred value to	debug  backend
	      problems.

	      Example: export SANE_DEBUG_AVISION=7

SEE ALSO
       sane(7),	sane-scsi(5), sane-usb(5)
       http://exactcode.com/site/open_source/saneavision/

MAINTAINER
       Rene Rebe

AUTHOR
       Rene Rebe and Meino Christian Cramer

				  11 Jul 2008		       sane-avision(5)

NAME | ABOUT THIS FILE | DESCRIPTION | CONFIGURATION | DEVICE NAMES | FILES | ENVIRONMENT | SEE ALSO | MAINTAINER | AUTHOR

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