NAME

       sane-canon630u - SANE backend for the Canon 630u USB flatbed scanner

DESCRIPTION

       The  sane-canon630u  library  implements a SANE (Scanner Access Now Easy) backend that provides access to
       the following Canon flatbed scanners:

              CanoScan 630u
              CanoScan 636u

       Color scanning is supported at 75, 150, 300, and 600 dpi, and gamma and analog gain are adjustable.

       TESTERS ARE WELCOME. Send your bug reports and comments to Nathan Rutman <nthn1@yahoo.com>.

CONFIGURATION

       The contents of the canon630u.conf file is a list of device names that correspond to Canon USB  scanners.
       Empty  lines  and lines starting with a hash mark (#) are ignored.  Only one device name can be listed in
       canon630u.conf.  The program sane-find-scanner(1) helps to find out the correct device. Under Linux, such
       a device name could be /dev/usb/scanner0 for example.  See sane-usb(5) for details.

       This product-specific scanner driver uses  the  lower-level  kernel  USB  driver  "scanner".   Check  for
       "Driver=usbscanner"  under /proc/bus/usb/devices.  If "Driver=(none)", try forcing it with insmod scanner
       vendor=0x04a9 product=0x2204

NOTES

       Due to Canon's unwillingness to provide scanner documentation, this software was developed  by  analyzing
       the  USB traffic of the Windows 2000 driver.  So things like the calibration procedure I kind of made up;
       it seems to work for my scanner.  If you have complaints, let me know.

       This driver requires the ability to send USB Control Messages, available in kernel 2.4.12 or later.

       Some users have reported that this driver doesn't work at all.  This seems  to  be  a  hardware  specific
       issue, although I dsane-uson't know what exactly the problem is.  If you are having problems, please send
       me   the   info   in   /proc/bus/usb/devices,   /proc/pci,  the  kernel  scanner.c  driver  version  from
       /var/log/messages, and the output from SANE_DEBUG_CANON630U=12 scanimage > /dev/null

FILES

       /etc/sane.d/canon630u.conf
              The backend configuration file (see also description of SANE_CONFIG_DIR below).

       /usr/lib/x86_64-linux-gnu/sane/libsane-canon630u.a
              The static library implementing this backend.

       /usr/lib/x86_64-linux-gnu/sane/libsane-canon630u.so
              The shared library implementing this backend (present on systems that support dynamic loading).

       /tmp/canon.cal
              The calibration file used to normalize pixel  brightness.   This  is  calculated  every  time  the
              scanner is first used after it has lost power.  Deleting this file will force recalibration.

ENVIRONMENT

       SANE_CONFIG_DIR
              This  environment  variable  specifies  the list of directories that may contain the configuration
              file. On *NIX systems, 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).

       SANE_DEBUG_CANON630U
              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.

              Example:
              SANE_DEBUG_CANON630U=12 scanimage > /dev/null

SEE ALSO

       sane(7), sane-usb(5), sane-find-scanner(1)
       http://canon-fb630u.sourceforge.net/

AUTHOR

       Nathan Rutman

                                                   11 Jul 2008                                 sane-canon630u(5)