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)