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
       Avision 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/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
              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).

       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://skull.piratehaven.org/~mike/sane/avision.html


MAINTAINER
       Mike Kelly

AUTHOR
       Rene Rebe and Meino Christian Cramer



                                  11 Jul 2008                  sane-avision(5)
