sane-genesys(5)          SANE Scanner Access Now Easy          sane-genesys(5)


       sane-genesys  -  SANE  backend for GL646, GL841, GL843, GL847 and GL124
       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 35/40/50/60/100/110/120/200/210/220/700
              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
       redone,  unless  you  use  the  --calibration-file  option.  If no home
       directory is defined, USERAPPPROFILE will be used, then TMPDIR or  TMP.
       If  none  of  these directories exist, the backend will try to write in
       the current working directory. Flatbed scanners also make  use  of  the
       calibration file as a cache to avoid calibration before each scan. Cal-
       ibration file name is the name of the scanner model if only one scanner
       is detected. In the case of several identical model, the file name will
       be the name of the logical USB device name. The expiration time manages
       the time a calibration is valid in cache.  A value of -1 means forever,
       0 means no cache.


       --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 with brightness below  that  value  will  be
              scanned as black.

       --brightness value
              -100..100 (in steps of 1). Set the brightness enhancement. 0 for
              no enhancement, negative values to decrease brightness, and pos-
              itive values to increase it.

       --contrast value
              -100..100  (in  steps of 1). Set the contrast enhancement. 0 for
              no enhancement, negative values to decrease contrast, and  posi-
              tive values to increase it.

       --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 disabled by this
              option to get real scanned data.

       --disable-dynamic-lineart yes|no
              Disable use of a software adaptive algorithm to generate lineart
              and rely on hardware lineart.

       --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.

              Clear  calibration  cache data, triggering a new calibration for
              the device when the next scan will happen.

              Specify the calibration file name to use. At least the directory
              containing  the file must exist, since it won't be created. This
              option is disabled if the backend is run as root. It maybe  used
              in  case  of  sheet-fed scanners to share a calibration file for
              several users.

              Specify the time (in minutes) a cached calibration is considered
              valid. If older than the given value, a new calibration is done.
              A value of -1 means no expiration and cached value are kept for-
              ever  unless cleared by userwith the calibration clear option. A
              value of 0 means cache is disabled.

       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 sur-
              rounding color.

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

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


       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
       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


              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.  On *NIX systems, the direc-
              tories are separated by a colon (`:'), under OS/2, they are sep-
              arated 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
              /usr/local/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 directo-
              ries.  For example, setting  SANE_CONFIG_DIR  to  "/tmp/config:"
              would    result    in    directories    tmp/config,    .,    and
              /usr/local/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.

              If  the  library  was  compiled with debug support enabled, this
              environment variable enables logging of intermediate image data.
              To enable this mode, set the environmental variable to 1.

              Example (full and highly verbose output for gl646):
              export SANE_DEBUG_GENESYS=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, Onetouch 2400

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

       Brian  Paavo  from Benthic Science Limited for donating a Canoscan LiDE

       Dany Qumsiyeh for donating a Canoscan LiDE 210 and a LiDE 220.

       Luc Verhaegen for donating a Canoscan LiDE 120.


       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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