sane-canon_dr(5)         SANE Scanner Access Now Easy         sane-canon_dr(5)


       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 57,  which  shipped  with  SANE


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

       This  backend  may support other Canon scanners. The best way to deter-
       mine 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.

       In general, the larger machines (DR-4000 and up) which have been tested
       use  a  fairly complete protocol, with hardware support for many modes,
       resolutions and features. The smaller machines have  many  limitations,
       like  missing horizontal resolutions, missing binary mode, always scan-
       ning full-width, etc.  There is code in the backend  to  address  these
       problems,  but there seems to be no way to detect if they are required,
       so they must be hard-coded.


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

       --source Flatbed|ADF Front|ADF Back|ADF Duplex
              Selects the source for the scan.

       --mode Lineart|Halftone|Gray|Color
              Selects the mode for the scan.

              Controls scan resolution.

       --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  scan-
       ner: enhancement, compression, buttons and sensors, etc.

       Additionally,  several  'software'  options are exposed by the backend.
       These are reimplementations of features  provided  natively  by  larger
       scanners,  but  running  on the host computer. This enables smaller ma-
       chines to have similar capabilities. Please note  that  these  features
       are  somewhat simplistic, and may not perform as well as the native im-
       plementations. Note also that  these  features  all  require  that  the
       driver cache the entire image in memory. This will almost certainly re-
       sult in a reduction of scanning speed.

              Requests the driver to  detect  the  extremities  of  the  paper
              within the larger image, and crop the empty edges.

              Requests  the  driver to detect the rotation of the paper within
              the larger image, and counter the rotation.

       --swdespeck X
              Requests the driver to find and remove dots  of  X  diameter  or
              smaller from the image, and fill the space with the average sur-
              rounding color.

              Use 'scanimage --help' to get a list, but be aware that some op-
              tions 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 buses 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 buses in the system for a de-
              vice 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 scan-
              ner 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

       "option duplex-offset [integer]"
              Some scanners pad the upper edge of one side of a  duplex  scan.
              There  is  some  variation in the amount of padding. Modify this
              option if your unit shows an unwanted band of image data on only
              one side.

       NOTE:  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 un-


       The various authors of  the  sane-fujitsu(5)  backend  provided  useful
       Yabarana Corp. provided significant funding.
       EvriChart,  Inc. provided funding and loaned equip-
       Canon, USA. loaned equipment.
       HPrint provided funding and testing for DR-2510 support.
       Stone-IT provided funding for DR-2010 and DR-2050 sup-
       Gerhard Pfeffer provided access and testing for P-208 and P-215.
       Special  thanks to: Alejandro Imass, Andre Shimakawa, Martijn van Brum-
       melen, Thanos Diacakis and Junren Shi for testing and feedback.


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


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

                                  31 Aug 2015                 sane-canon_dr(5)

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