sane-leo(5)               (11 Jul 2008)               sane-leo(5)

     NAME
          sane-leo - SANE backend for LEO Technologies scanners

     DESCRIPTION
          The sane-leo library implements a SANE (Scanner Access Now
          Easy) backend that provides access to some LEO SCSI flatbed
          scanners. This backend should be considered beta-quality
          software! LEO scanners were also sold under the Across Tech-
          nologies brand.

          The scanners that should work with this backend are:

                  Vendor Model           status
               ----------------------  -----------
                 Across FS-1130          tested
                 LEO S3                  tested

          The options the backend supports can either be selected
          through command line options to programs like scanimage(1)
          or through GUI elements in xscanimage(1) or xsane(1).

          If you have any strange behavior, please report to the back-
          end maintainer or to the SANE mailing list.

          Valid command line options and their syntax can be listed by
          using
               scanimage --help -d leo

          Scan Mode

          --mode
               selects the basic mode of operation of the scanner
               valid choices are Black & White , Grayscale and Color
               The Black & White mode is black and white only (1 bit).
               Grayscale will produce 256 levels of gray (8 bits).
               Color will produce a 24 bits color image.

          --resolution
               selects the resolution for a scan. The scanner can do
               all resolutions between 1 and 300, in increments of 1.

          Geometry options

          -l -t -x -y

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               control the scan area: -l sets the top left x coordi-
               nate, -t the top left y coordinate, -x selects the
               width and -y the height of the scan area. All parame-
               ters are specified in millimeters by default.

          Enhancement options

          --custom-gamma
               (grayscale and color mode only) allows the user to
               specify a gamma table (see the next 3 parameters).

          --red-gamma-table
               (color mode only) can be used to download a user
               defined gamma table for the red channel. The table must
               be 256 bytes long.

          --green-gamma-table
               (color mode only) can be used to download a user
               defined gamma table for the green channel. The table
               must be 256 bytes long.

          --blue-gamma-table
               (color mode only) can be used to download a user
               defined gamma table for the blue channel. The table
               must be 256 bytes long.

          --halftone
               (Black & White only) select the halftone mask to use.
               Possible values are Diamond , 8x8 Coarse Fatting , 8x8
               Fine Fatting , 8x8 Bayer and 8x8 Vertical Line

          --preview
               requests a preview scan. The resolution used for that
               scan is 28 dpi and the scan area is the maximum
               allowed. The scan mode is user selected. The default is
               "no".

     CONFIGURATION FILE
          The configuration file /etc/sane.d/leo.conf supports only
          one information: the device name to use (eg /dev/scanner).

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     FILES
          /usr/lib/x86_64-linux-gnu/sane/libsane-leo.a
               The static library implementing this backend.

          /usr/lib/x86_64-linux-gnu/sane/libsane-leo.so
               The shared library implementing this backend (present
               on systems that support dynamic loading).

     ENVIRONMENT
          SANE_DEBUG_LEO
               If the library was compiled with debug support enabled,
               this environment variable controls the debug level for
               this backend. E.g., a value of 128 requests all debug
               output to be printed. Smaller levels reduce verbosity.

     LIMITATIONS
          The windows TWAIN driver has many more options than this
          SANE backend. However they are only software adjustments.
          This backend only implements what the scanner can support.

          SH BUGS None known.

     SEE ALSO
          sane-scsi(5), scanimage(1), xscanimage(1), xsane(1), sane(7)

     AUTHOR
          The package is actively maintained by Frank Zago.
               http://www.zago.net/sane/#leo

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