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/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
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 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
model "Compact Scan USB 19200"
afe 0x20 0x02 0x22 0x03 0x1f 0x04
The backend configuration file (see also description of
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 /etc/sane.d. If the
value of the environment variable ends with the directory sepa-
rator character, then the default directories are searched after
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 <firstname.lastname@example.org>
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 http://www.meier-geinitz.de/sane/gt68xx-backend/. Please contact
us if you find a bug or missing feature:
<email@example.com>. Please send a debug log if your
scanner isn't detected correctly (see SANE_DEBUG_GT68XX above).
13 Jul 2008 sane-gt68xx(5)
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