based USB flatbed scanners

       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, GL843, GL847 and GL124 chips.   At  present,  the
       following scanners are known to work with this backend:

              Canon LiDE 35/40/50/60/100/110/200/210/700
              Hewlett-Packard HP2300C/HP2400/HP3670/HP3690/G4010/G4050
              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/Roadwar-
              Xerox Travel Scanner 100, OneTouch 2400

       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, GL847 or GL124 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

       --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

       --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

                      The lamp will be turned off during the scan. Calibration
              is still done with lamp on.

       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 capabilities. 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.

                   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.

       --swskip 0..100% (in steps of 1) [0]
                      Request driver to discard pages with low numbers of dark

       --swderotate[=(yes|no)] [no]
                      Request driver to detect and  correct  90  degree  image

       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 com-
       piled. For setting permissions and  general  USB  information  look  at

       The contents of the genesys.conf file is a list of usb lines containing
              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 config-
              uration  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 sepa-
              rator 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

              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  spe-
              cific GL646 code part.

              This  environment variable controls the debug level for the spe-
              cific GL841 code part.

              This environment variable controls the debug level for the  spe-
              cific GL843 code part.

              This  environment variable controls the debug level for the spe-
              cific GL847 code part.

              This environment variable controls the debug level for the  spe-
              cific GL124 code part.

              Canon LiDE 200
              Pentax DSmobile 600
              Syscan/Ambir DocketPORT 467/485/487/665/685
              Xerox Travel Scanner 100, Onetouch 2400

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

       Brian  Paavo  from Benthic Science Limited for donating a Canoscan LiDE

       sane(7), sane-usb(5)

       Oliver Rauch
       Henning Meier-Geinitz <>
       Gerhard Jaeger <>
       Stephane Voltz <>
       Philipp Schmid <>
       Pierre Willenbrock <>
       Alexey Osipov <> for HP2400 final support

       Powersaving isn't implemented for gl646 based  scanner.  Dynamic  (emu-
       lated  from gray data and with dithering) isn't enabled for gl646 scan-
       ners. Hardware lineart is limited up to 600 dpi for gl847  based  scan-
       ners, due to the way image sensors are built.

       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.

       For the LiDE 200, the scanned data at 4800 dpi is obtained "as is" from
       sensor.  It  seems  the  windows driver does some digital processing to
       improve it, which is not implemented in the backend.

                                  4 Jul 2012                   sane-genesys(5)
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