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# sane-avision.5

    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 scanners

## ABOUT THIS FILE

           This file only is a short descripton of the avision-backend for 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.

## CONFIGURATION

           The    configuration    file    for    this    backend    resides    in
                /usr/local/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:

           I  suggest  you  hold one hand on the power-button of the scanner while
           you try the first scans!

            # this is a comment

            option force-a4
            option disable-gamma-table
            option disable-calibration
            option one-calib-only
            option old-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. This might be needed for
              the AV 630 which returns no area - or newer scanners
              which retun the area in a unkown format our backend
              doesn't recongize yet.

            - 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.

            - one-calib-only:
              When this option is enabled, the backend will only
              perform a calibration when the backend is initialized
              and not before each scan. This might extend the life
              of the CCD, but does not work reliable with the newer
              USB scanners (they hang sometimes or return garbage
              image data). So this option should be used with care.

            - old-calibration:
              This enables the use of the old calibration code for
              testing purposes.

            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 special usb special

           Where special is the path-name for the device  that  corresponds  to  a
           SCSI scanner or the USB vendor/product ID pair corresponding to the USB
           scanner. The special device name must be a generic  SCSI  device  or  a
           symlink  to such a device.  The program sane-find-scanner helps to find
           out the correct device. Under  Linux,  such  a  device  name  could  be
           /dev/sg0 or /dev/sga, for example.  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 the scanner via the SCSI emulation (named
                  hpusbscsi on Linux) for Avision USB devices such as
                  the HP 53xx, HP 74xx or Minolta film-scanners.

            A list with supported devices is built into the avision backend so
            normally 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/local/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 directo-
                  ries.  For example, setting  SANE_CONFIG_DIR  to  "/tmp/config:"
                  would    result    in   directories   "tmp/config",   ".",   and
                  "/usr/local/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)
           http://drocklinux.dyndns.org/rene/avision/index.html

## AUTHOR

           Ren? Rebe and Meino Christian Cramer

    sane-backends 1.0.12-cvs          04 Mar 2003                  sane-avision(5)