Provided by: libsane-common_1.1.1-5ubuntu1_all 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, 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/Roadwarrior
              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.

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, 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.  Calibration  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.

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
              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 positive 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 positive 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 selected.

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

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

       --calibration-file
              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.

       --expiration-time
              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 forever 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.

       --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.

       --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.

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/x86_64-linux-gnu/sane/libsane-genesys.a
              The static library implementing this backend.

       /usr/lib/x86_64-linux-gnu/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.   On  *NIX  systems,  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_IMAGE
              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

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, Onetouch 2400

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

       Brian Paavo from Benthic Science Limited for donating a Canoscan LiDE 700F.

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

       Luc Verhaegen for donating a Canoscan LiDE 120.

SEE ALSO

       sane(7), sane-usb(5)

AUTHOR

       Oliver Rauch
       Henning Meier-Geinitz <henning@meier-geinitz.de>
       Gerhard Jaeger <gerhard@gjaeger.de>
       St├ęphane Voltz <stef.dev@free.fr>
       Philipp Schmid <philipp8288@web.de>
       Pierre Willenbrock <pierre@pirsoft.dnsalias.org>
       Alexey Osipov <simba@lerlan.ru> for HP2400 final support

LIMITATIONS

       Powersaving isn't implemented for gl646 based scanner. Dynamic (emulated  from  gray  data
       and  with  dithering)  isn't enabled for gl646 scanners. Hardware lineart is limited up to
       600 dpi for gl847 based scanners, 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.

BUGS

       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)