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)