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)