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

NAME

       sane-avision  -	SANE  backend  for original Avision and Avision OEM scanners (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/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 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 scanner. 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 example 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-scanners.

       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 normally 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/lib64/sane/libsane-avision.a
	      The static library implementing this backend.

       /usr/lib64/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 configura-
	      tion 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 explic-
	      itly 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

       Rene Rebe and Meino Christian Cramer

								    11 Jul 2008 						   sane-avision(5)