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

NAME

       sane-gt68xx - SANE backend for GT-68XX based USB flatbed scanners

DESCRIPTION

       The  sane-gt68xx library implements a SANE (Scanner Access Now Easy) backend that provides
       access to USB flatbed scanners based on the Grandtech GT-6801 and GT-6816 chips.   A  list
       of    supported    scanners    can    be   found   on   the   gt68xx   backend   homepage:
       http://www.meier-geinitz.de/sane/gt68xx-backend/.

       This is BETA software. Especially 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 on the gt68xx homepage 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 sane-find-scanner or syslog) to me. Even if the
       scanner's name is only slightly different from the models  already  listed  as  supported,
       please let me know.

       If  you  own  a  scanner  that  isn't  detected by the gt68xx backend but has a GT-6801 or
       GT-6816 chipset, you can try to add it to the backend. Have a look at  the  following  web
       page: http://www.meier-geinitz.de/sane/gt68xx-backend/adding.html

LIBUSB ISSUES

       Please  use  libusb-0.1.8 or later. Without libusb or with older libusb versions all kinds
       of trouble can be expected. The scanner  should  be  found  by  sane-find-scanner  without
       further actions. For setting permissions and general USB information looks at sane-usb(5).

FIRMWARE FILE

       You  need  a  firmware file for your scanner. That's a small file containing software that
       will be uploaded to the scanner's memory. It's usually named *.usb, e.g.   PS1fw.usb.   It
       comes on the installation CD that was provided by the manufacturer, but it may be packaged
       together with the installation program in an .exe file. For Mustek scanners, the file  can
       be  downloaded from the gt68xx backend homepage. For other scanners, check the CD for .usb
       files. If you only find *.cab files, try cabextract to unpack. If everything  else  fails,
       you  must  install  the  Windows  driver  and  get the firmware from there (usually in the
       windows/system   or   system32    directories).    Put    that    firmware    file    into
       /usr/share/sane/gt68xx/.  Make sure that it's readable by everyone.

CONFIGURATION

       The  contents of the gt68xx.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 gt68xx.conf.   "vendor_id"
       and "product_id" are hexadecimal numbers that identify the scanner.

       The  override,  firmware, vendor, model, and afe options must be placed after the usb line
       they refer to.

       Option override is used to override the default model  parameters.  That's  necessary  for
       some  scanners  that use the same vendor/product ids but are different. For these scanners
       there are already commented out  override  lines  in  the  configuration  file.   override
       mustek-scanexpress-1200-ub-plus  is necessary for the Mustek Scanexpress 1200 UB Plus, the
       Medion/Lifetec/Tevion  LT  9452,  and  the  Trust  Compact  Scan  USB   19200.    override
       artec-ultima-2000  is  used  for the Artec Ultima 2000, the Boeder SmartScan Slim Edition,
       the Medion/ Lifetec/ Tevion/ Cytron MD/LT 9385, the Medion/ Lifetec/ Tevion MD  9458,  and
       the  Trust  Flat  Scan  USB  19200.   override mustek-bearpaw-2400-cu is necessary for the
       Mustek BearPaw 2400 CU and the Fujitsu 1200CUS. The override option must be the first  one
       after the usb line.

       Option firmware selects the name and path of the firmware file. It's only necessary if the
       default   (or   override)   doesn't   work.   The   default    firmware    directory    is
       /usr/share/sane/gt68xx/.   You may need to create this directory. If you want to place the
       firmware files at a different path, use a firmware line.

       The vendor and model options are not absolutely necessary but for convenience. Quite a lot
       of  scanners from different manufacturers share the same vendor/product ids so you can set
       the "correct" name here.

       The afe option allows to set custom offset and gain values for the Analog FrontEnd of  the
       scanner.  This  option  can  be  either  used to select the AFE values if automatic coarse
       calibration is disabled, or to make automatic coarse calibration faster.  For  the  latter
       usage, enable debug level 3 (see below), scan an image and look for debug line string with
       "afe". Copy this line to gt68xx.conf.  The option has  six  parameters:  red  offset,  red
       gain, green offset, green gain, blue offset, and blue gain.

       A sample configuration file is shown below:

              usb 0x05d8 0x4002
              override "mustek-scanexpress-1200-ub-plus"
              firmware "/opt/gt68xx/SBfw.usb"
              vendor "Trust"
              model "Compact Scan USB 19200"
              afe 0x20 0x02 0x22 0x03 0x1f 0x04

FILES

       /etc/sane.d/gt68xx.conf
              The backend configuration file (see also description of SANE_CONFIG_DIR below).

       /usr/lib/arch_triplet/sane/libsane-gt68xx.a
              The static library implementing this backend.

       /usr/lib/arch_triplet/sane/libsane-gt68xx.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.   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).

       SANE_DEBUG_GT68XX
              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.

              Example: export SANE_DEBUG_GT68XX=4

SEE ALSO

       sane(7),     sane-usb(5),    sane-artec_eplus48u(5)    sane-plustek(5),    sane-ma1509(5),
       sane-mustek_usb(5), sane-mustek(5), sane-mustek_pp(5)
       /usr/share/doc/libsane/gt68xx/gt68xx.CHANGES
       http://www.meier-geinitz.de/sane/gt68xx

AUTHOR

       Henning Meier-Geinitz <henning@meier-geinitz.de>
       The original gt68xx driver was  written  by  Sergey  Vlasov,  Andreas  Nowack,  and  David
       Stevenson.  Thanks  for  sending patches and answering questions to them and all the other
       contributors.

BUGS

       The first few lines of the image are garbage for the 2400 TA Plus.

       Interpolation should be used instead of just copying data, when the  X-  and  Y-resolution
       differ.

       Support for buttons is missing.

       More   detailed   bug   information   is   available   at   the  gt68xx  backend  homepage
       http://www.meier-geinitz.de/sane/gt68xx-backend/.  Please contact us if you find a bug  or
       missing  feature:  <sane-devel@lists.alioth.debian.org>.  Please  send a debug log if your
       scanner isn't detected correctly (see SANE_DEBUG_GT68XX above).

                                           13 Jul 2008                             sane-gt68xx(5)