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 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 don'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/arch_triplet/sane/libsane-canon630u.a
              The static library implementing this backend.

       /usr/lib/arch_triplet/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.   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  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)