Provided by: libsane_1.0.20-4ubuntu3_i386 bug


       sane-canon_dr - SANE backend for Canon DR-series scanners


       The  sane-canon_dr  library implements a SANE (Scanner Access Now Easy)
       backend which provides access to some Canon DR-series scanners.

       This document describes backend version 26,  which  shipped  with  SANE


       This version has only been tested with a few scanner models. Please see  for   a   more
       recent list.

       This  backend  may  support  other  Canon  scanners.  The  best  way to
       determine level of support is to  test  the  scanner  directly,  or  to
       collect  a  trace  of the windows driver in action.  Please contact the
       author for help or with test results.


       Effort has been made to expose most hardware options, including:

       source s
              Selects the source for the scan. Options may include  "Flatbed",
              "ADF Front", "ADF Back", "ADF Duplex".

       mode m
              Selects  the  mode  for the scan. Options may include "Lineart",
              "Halftone", "Gray", and "Color".

       resolution, y-resolution
              Controls  scan  resolution.  Setting  --resolution   also   sets
              --y-resolution,  though  this  behavior  is  overridden  by some

       tl-x, tl-y, br-x, br-y
              Sets scan area upper left and lower right coordinates. These are
              renamed t, l, x, y by some frontends.

       page-width, page-height
              Sets  paper size. Used by scanner to determine centering of scan
              coordinates when using ADF and to detect double feed errors.

       Other options will be  available  based  on  the  capabilities  of  the
       scanner: enhancement, compression, buttons and sensors, etc.

       Use  ’scanimage  --help’  to get a list, but be aware that some options
       may be settable only  when  another  option  has  been  set,  and  that
       advanced options may be hidden by some frontend programs.


       The  configuration file "canon_dr.conf" is used to tell the backend how
       to look for scanners, and provide options controlling the operation  of
       the backend.  This file is read each time the frontend asks the backend
       for a list of scanners, generally only when the frontend starts. If the
       configuration file is missing, the backend will fail to run.

       Scanners can be specified in the configuration file in 4 ways:

       "scsi CANON DR"
              Requests  backend  to search all scsi busses in the system for a
              device which reports itself to be a  scanner  made  by  ’CANON’,
              with a model name starting with ’DR’.

       "scsi /dev/sg0" (or other scsi device file)
              Requests  backend  to open the named scsi device. Only useful if
              you have multiple compatible scanners connected to your  system,
              and  need  to  specify one. Probably should not be used with the
              other "scsi" line above.

       "usb 0x04a9 0x1603" (or other vendor/product ids)
              Requests backend to search all usb busses in the  system  for  a
              device  which  uses  that vendor and product id. The device will
              then be queried to determine if it is a Canon scanner.

       "usb /dev/usb/scanner0" (or other device file)
              Some systems use a kernel driver to access  usb  scanners.  This
              method is untested.

       Besides the ’scsi’ and ’usb’ lines, the configuration file supports the
       following ’option’ lines:

       "option buffer-size [number of bytes]"
              Set the number of bytes in the data buffer  to  something  other
              than  the  compiled-in  default  of  4MB. Large values may cause
              timeouts or hangs, small values may cause slow scans.

              Note: The backend does not place an upper bound on  this  value,
              as  some  users  required it to be quite large. Values above the
              default are not recommended, and may crash  your  OS  or  lockup
              your scsi card driver. You have been warned.

       "option vendor-name [string of text]"
       "option model-name [string of text]"
       "option version-name [string of text]"
              These  options  can  be used collectively to override the values
              provided by the scanner, or  to  provide  the  values  when  the
              scanner cannot.

       "option padded-read [0|1]"
              Some  scanners  prepend  all  data  transmitted  to host with 12
              bytes. Enable this option if the scanner  fails  to  respond  to

       Note:  ’option’  lines  may  appear multiple times in the configuration
       file.  They only apply to scanners discovered by  the  next  ’scsi/usb’


       The  backend  uses  a single environment variable, SANE_DEBUG_CANON_DR,
       which enables debugging output to stderr. Valid values are:

              5  Errors
              10 Function trace
              15 Function detail
              20 Option commands
              25 SCSI/USB trace
              30 SCSI/USB detail
              35 Useless noise


       This backend was entirely reverse engineered from  usb  traces  of  the
       proprietary  driver.  Various advanced features of the machines may not
       be enabled. Many machines have  not  been  tested.  Their  protocol  is


       The  various  authors  of the sane-fujitsu backend provided useful code
       Corcaribe Tecnología C.A.  provided  significant  funding
       EvriChart, Inc. provided funding and loaned equipment
       Canon, USA. loaned equipment


       sane(7), sane-scsi(5), sane-usb(5)


       m. allan noah: <kitno455 a t gmail d o t com>

                                  20 Apr 2009                 sane-canon_dr(5)