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




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

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

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

       /opt/local/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.  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
              /opt/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
              directories.  For example, setting SANE_CONFIG_DIR to
              "/tmp/config:" would result in directories tmp/config, ., and
              /opt/local/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>
       Stephane 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)

sane-backends 1.2.1 - Generated Sat Feb 25 11:24:21 CST 2023
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