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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  scan-
           ners.

## 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.

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

## 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:

            # 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 scsi-spec

                  usb usb-sec

           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 exam-
           ple 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 nor-
           mally 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), sane-usb(5)
           http://www.rocklinux-consulting.de/oss/avision/

## AUTHOR

           René Rebe and Meino Christian Cramer

    sane-backends 1.0.13              04 Mar 2003                  sane-avision(5)