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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:

       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 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
       /usr/local/share/sane/gt68xx/.  Make sure that it's readable by	every-

       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 /usr/local/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  /usr/lo-
	      cal/etc/sane.d.  If the value of the environment	variable  ends
	      with  the	directory separator character, then the	default	direc-
	      tories are searched after	the explicitly specified  directories.
	      For example, setting SANE_CONFIG_DIR to "/tmp/config:" would re-
	      sult   in	  directories	"tmp/config",	".",   and   "/usr/lo-
	      cal/etc/sane.d" being searched (in this order).

	      If the library was compiled with debug support enabled, this en-
	      vironment	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
       us  if  you find	a bug or missing feature: <>. Please send a	debug log if your scanner isn't	detected  cor-
       rectly (see SANE_DEBUG_GT68XX above).

				  13 Jul 2008			sane-gt68xx(5)


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