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


       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 <>


       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"


       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"


              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).

              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.


              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).

              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.

              SANE_DEBUG_CANON630U=12 scanimage > /dev/null


       sane(7), sane-usb(5), sane-find-scanner(1)


       Nathan Rutman

                                  11 Jul 2008                sane-canon630u(5)