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sane-gt68xx(5)		 SANE Scanner Access Now Easy		sane-gt68xx(5)

       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:   http://www.meier-

       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-

       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 permis‐
       sions and general USB information looks at sane-usb(5).

       You need a firmware file for your scanner. That's a small file contain‐
       ing  software  that will be uploaded to the scanner's memory. It's usu‐
       ally 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 win‐
       dows/system or system32 directories). Put that firmware file into /sys‐
       tem/resources/sane-backends/1.0.18/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-scanex‐
       press-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	  /system/resources/sane-back‐
       ends/1.0.18/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  con‐
       venience.  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 Ana‐
       log  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

       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 config‐
	      uration  file is searched in two default directories: first, the
	      current	working	  directory   (".")   and   then   in	 /sys‐
	      tem/resources/sane-backends/1.0.18/etc/sane.d.   If the value of
	      the environment variable ends with the directory separator char‐
	      acter,  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	 "/system/resources/sane-back‐
	      ends/1.0.18/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	 home‐
       page	Please contact
       me 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).

sane-backends 1.0.18	       29 September 2005		sane-gt68xx(5)

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