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       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 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)