Provided by: libsane_1.0.22-2ubuntu2_i386 bug

NAME

       sane-genesys  -  SANE  backend for GL646, GL841, GL843, GL847 and GL124
       based USB flatbed scanners

DESCRIPTION

       The sane-genesys library implements a SANE (Scanner  Access  Now  Easy)
       backend  that  provides  access  to  USB  flatbed scanners based on the
       Genesys GL646, GL841  and  GL847  chips.   At  present,  the  following
       scanners are known to work with this backend:

              Canon LiDE 35/40/50/60/100/110/200/210
              Hewlett-Packard HP2300C/HP3670/HP3690
              Medion MD5345/MD6228/MD6274
              Panasonic KV-SS080
              Plustek OpticBook 3600
              Pentax DSmobile 600
              Syscan/Ambir DocketPORT 467/485/487/665/685
              Visioneer           OneTouch          7100/Strobe          XP100
              (rev3)/XP200/XP300/Roadwarrior
              Xerox Travel Scanner 100

       This is stable software for supported models. But if you  test  new  or
       untested  scanners, keep your hand at the scanner's plug and unplug it,
       if the head bumps at the end of the scan area.

       If you own a scanner other than the ones listed above that  works  with
       this  backend,  please  let me know this by sending the scanner's exact
       model  name  and  the  USB   vendor   and   device   ids   (e.g.   from
       /proc/bus/usb/devices,  sane-find-scanner  or syslog) to the sane-devel
       mailing list. Even if the scanner's name  is  only  slightly  different
       from the models mentioned above, please let me know.

       If you own a scanner that isn't detected by the genesys backend but has
       a GL646, GL841, GL843 or GL847 chipset, you can try to add  it  to  the
       backend.

CALIBRATION

       To give correct image quality, sheet fed scanners need to be calibrated
       using the calibration sheet sold with the scanner. To  do  calibration,
       you must insert this target in the feeder then start calibration either
       by passing the --calibrate option to scanimage or by  clicking  on  the
       available  'calibrate'  button in the 'advanced options' in a graphical
       frontend. The result of the calibration is stored in a file in the home
       directory  of  the  user  doing it.  If you plug the scanner in another
       machine or use it with another account, calibration  will  have  to  be
       redone.

EXTRAS SCAN OPTIONS

       --lamp-off-time number
                      The  lamp  will  be  turned off after the given time (in
              minutes). A value of 0 means that the lamp won't be turned off.

       --threshold percent
                   0..100% (in steps of 1). Select minimum brightness to get a
              white  point.  Pixels  whith brightness below that value will be
              scanned as black.

       --disable-interpolation yes|no
                      When  using  high  resolutions  where   the   horizontal
              resolution is smaller than vertical resolution, data is expanded
              by software to preserve picture geometry. This can be disbled by
              this option to get real scanned data.

       --color-filter None|Red|Green|Blue
                      When  using gray or lineart this option selects the used
              color. Using a color filter will give  a  monochrome  scan.  CIS
              based  scanners  can to true gray when no filter (None value) is
              selected.

       Additionally, several 'software' options are exposed  by  the  backend.
       These  are  reimplementations  of  features provided natively by larger
       scanners, but running  on  the  host  computer.  This  enables  smaller
       machines  to  have similar capabilites. Please note that these features
       are somewhat simplistic, and may not perform  as  well  as  the  native
       implementations.  Note  also  that  these features all require that the
       driver cache the entire image in memory.  This  will  almost  certainly
       result in a reduction of scanning speed.

       --swcrop
                   Requests  the driver to detect the extremities of the paper
              within the larger image, and crop the empty edges.

       --swdeskew
                   Requests the driver to detect the  rotation  of  the  paper
              within the larger image, and counter the rotation.

       --swdespeck --despeck X
                   Requests  the  driver to find and remove dots of X diameter
              or smaller from the image, and fill the space with  the  average
              surrounding color.

SYSTEM ISSUES

       This  backend  needs libusb-0.1.6 or later installed, and hasn't tested
       in other configuration than a linux kernel 2.6.9 or higher. However, it
       should  work  any  system  with  libusb  where  the SANE package can be
       compiled. For setting permissions and general USB information  look  at
       sane-usb(5).

CONFIGURATION

       The contents of the genesys.conf file is a list of usb lines containing
       vendor and product ids that correspond to USB scanners.  The  file  can
       also  contain option lines.  Empty lines and lines starting with a hash
       mark (#) are ignored.  The scanners are autodetected by  usb  vendor_id
       product_id  statements  which  are  already included into genesys.conf.
       "vendor_id" and "product_id" are hexadecimal numbers that identify  the
       scanner.

FILES

       /etc/sane.d/genesys.conf
              The   backend   configuration  file  (see  also  description  of
              SANE_CONFIG_DIR below).

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

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

ENVIRONMENT

       SANE_CONFIG_DIR
              This environment variable specifies the list of directories that
              may contain the configuration file.  Under UNIX, the directories
              are  separated  by a colon (`:'), under OS/2, they are separated
              by a semi-colon  (`;').   If  this  variable  is  not  set,  the
              configuration  file  is  searched  in  two  default directories:
              first,  the  current  working  directory  (".")  and   then   in
              /etc/sane.d.  If the value of the environment variable ends with
              the directory separator character, then the default  directories
              are  searched  after  the explicitly specified directories.  For
              example, setting SANE_CONFIG_DIR to "/tmp/config:" would  result
              in   directories  "tmp/config",  ".",  and  "/etc/sane.d"  being
              searched (in this order).

       SANE_DEBUG_GENESYS
              If the library was compiled with  debug  support  enabled,  this
              environment  variable controls the debug level for this backend.
              Higher debug levels increase the verbosity of the output. If the
              debug  level  is  set  to 1 or higher, some debug options become
              available that are normally hidden. Handle them with care.  This
              will print messages related to core genesys functions.

       SANE_DEBUG_GENESYS_LOW
              This environment variable controls the debug level for low level
              functions common to all genesys ASICs.

       SANE_DEBUG_GENESYS_GL646
              This environment variable  controls  the  debug  level  for  the
              specific GL646 code part.

       SANE_DEBUG_GENESYS_GL841
              This  environment  variable  controls  the  debug  level for the
              specific GL841 code part.

       SANE_DEBUG_GENESYS_GL843
              This environment variable  controls  the  debug  level  for  the
              specific GL843 code part.

       SANE_DEBUG_GENESYS_GL847
              This  environment  variable  controls  the  debug  level for the
              specific GL847 code part.

       SANE_DEBUG_GENESYS_GL124
              This environment variable  controls  the  debug  level  for  the
              specific GL124 code part.

              Example (full and highly verbose output for gl646):
              export SANE_DEBUG_GENESYS=255
              export SANE_DEBUG_GENESYS_LOW=255
              export SANE_DEBUG_GENESYS_GL646=255

CREDITS

       Jack  McGill  for donating several sheetfed and flatbed scanners, which
       made possible to add support for them in the genesys backend:
              Hewlett-Packard HP3670
              Visioneer Strobe XP100 (rev3)/XP200/XP300/Roadwarrior
              Canon LiDE 200
              Pentax DSmobile 600
              Syscan/Ambir DocketPORT 467/485/487/665/685
              Xerox Travel Scanner 100

       cncsolutions (http://www.cncsolutions.com.br) sponsored  and  supported
       the work on the Panasonic KV-SS080.

SEE ALSO

       sane(7), sane-usb(5)

AUTHOR

       Oliver Rauch
       Henning Meier-Geinitz <henning@meier-geinitz.de>
       Gerhard Jaeger <gerhard@gjaeger.de>
       Stephane Voltz <stef.dev@free.fr>
       Philipp Schmid <philipp8288@web.de>
       Pierre Willenbrock <pierre@pirsoft.dnsalias.org>

LIMITATIONS

       Powersaving isn't implemented for gl646 based scanner.

       This  backend  will  be much slower if not using libusb-1.0. So be sure
       that sane-backends is built with the --enable-libusb_1_0 option.

BUGS

       Currently no known bug.

                                  26 Dec 2010                  sane-genesys(5)