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)


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