Provided by: libsane-common_1.0.22-7ubuntu1_amd64 bug


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


       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.


       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.


       --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

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

                   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.


       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).


       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.


              The backend configuration file (see also description of SANE_CONFIG_DIR below).

              The static library implementing this backend.

              The  shared  library  implementing  this  backend  (present on systems that support
              dynamic loading).


              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).

              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.

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

              This  environment  variable  controls  the  debug level for the specific GL646 code

              This environment variable controls the debug level  for  the  specific  GL841  code

              This  environment  variable  controls  the  debug level for the specific GL843 code

              This environment variable controls the debug level  for  the  specific  GL847  code

              This  environment  variable  controls  the  debug level for the specific GL124 code

              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


       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  (  sponsored  and  supported  the work on the
       Panasonic KV-SS080.


       sane(7), sane-usb(5)


       Oliver Rauch
       Henning Meier-Geinitz <>
       Gerhard Jaeger <>
       St├ęphane Voltz <>
       Philipp Schmid <>
       Pierre Willenbrock <>


       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.


       Currently no known bug.

                                           26 Dec 2010                            sane-genesys(5)