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


   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:

   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:


   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).


   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.


   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

   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 one 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


          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.  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).

          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


   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)


   Henning Meier-Geinitz <>
   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.


   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    Please
   contact   us   if   you   find    a    bug    or    missing    feature:
   <>.  Please  send a debug log if your
   scanner isn't detected correctly (see SANE_DEBUG_GT68XX above).

                              13 Jul 2008                   sane-gt68xx(5)


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.