sane-leo(5)						   SANE Scanner Access Now Easy 					       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 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 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
	      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/lib64/sane/libsane-leo.a
	      The static library implementing this backend.

       /usr/lib64/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.

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)