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 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(1) or through GUI elements in xscanimage(1) or xsane(1).

       If you have any strange behavior, please report to the backend 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  mode  will produce 256 levels of gray (8 bits).  Color mode will
              produce a 24 bit 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
              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 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).

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.

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

                                           11 Jul 2008                                sane-leo(5)