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

       /usr/lib/arch_triplet/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 preferred 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

       René Rebe and Meino Christian Cramer

                                                   11 Jul 2008                                   sane-avision(5)