NAME

       sane-sceptre - SANE backend for SCEPTRE scanners

DESCRIPTION

       The sane-sceptre library implements a SANE (Scanner Access Now Easy) backend that provides
       access to Sceptre  flatbed  scanners.  This  backend  should  be  considered  beta-quality
       software!  Please  report  any strange behavior to the maintainer of the backend or to the
       SANE mailing list.

       At present, only one scanner is known to work with this backend:

              Model                        Connection Type
              ---------------------------  -------------------
              Sceptre VividScan S1200      SCSI

       The make of this scanner is KINPO, so other scanners from that manufacturer may also  work
       (eg. the S600).

OPTIONS

       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.

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

       Scan Mode

       --mode selects the basic mode of operation of  the  scanner  valid  choices  are  Lineart,
              Halftone,  Gray  and Color.  The Lineart and Halftone mode are black and white only
              (1 bit). Gray will produce 256 levels of gray (8 bits). Color  will  produce  a  24
              bits color image. The scanner supports 30 bits internally but it only exports 24.

       --resolution
              selects  the  resolution for a scan. The scanner can do several resolutions between
              50 and 1200.

       --halftone-pattern
              selects the pattern mode that is used in Halftone mode. Valid options are 1,  2,  3
              and 4.

       --gamma-correction
              controls  the scanner internal gamma correction. Valid options are "Default", "User
              defined", "High  density  printing"  "Low  density  printing"  and  "High  contrast
              printing".

       --custom-gamma
              (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.

       --threshold
              sets  the threshold for black and white pixels in lineart mode. Possible values are
              from 0 (darker) to 255 (lighter).

       --preview
              requests a preview scan. The resolution used for that scan is 30 dpi and  the  scan
              area is the maximum allowed. The scan mode is user selected. The default is "no".

       The 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.

CONFIGURATION FILE

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

FILES

       /usr/lib/arch_triplet/sane/libsane-sceptre.a
              The static library implementing this backend.

       /usr/lib/arch_triplet/sane/libsane-sceptre.so
              The shared library implementing this  backend  (present  on  systems  that  support
              dynamic loading).

ENVIRONMENT

       SANE_DEBUG_SCEPTRE
              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

       Resolutions
              The windows TWAIN driver can be set to any resolution between 50 to 1200 (excluding
              software interpolation). This backend cannot. Only  a  handful  of  resolution  are
              available, although they should be numerous enough.

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/#sceptre

                                           11 Jul 2008                            sane-sceptre(5)