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sane-leo


DESCRIPTION

       The  sane-leo library implements a SANE (Scanner Access Now Easy) back-
       end that provides access to some LEO SCSI flatbed scanners. This  back-
       end  should be considered beta-quality software! LEO scanners were also
       sold under the Across Technologies 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 or through GUI elements in
       xscanimage or xsane.

       If you have any strange behavior, please report to  the  backend  main-
       tainer 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 lev-
              els of gray (8 bits). Color will produce a 24 bits color  image.

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

       Geometry options

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

       Enhancement options

       --custom-gamma
              (grayscale  and  color  mode  only) allows the user to specify a
              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 informa-
       tion: the device name to use (eg /dev/scanner).


FILES

       /usr/lib*/sane/libsane-leo.a
              The static library implementing this backend.

       /usr/lib*/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 imple-
       ments what the scanner can support.


BUGS

       None known.


                                 16 April 2002                     sane-leo(5)

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