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

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

DESCRIPTION
       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 51,  which  shipped  with  SANE
       1.0.25.

SUPPORTED HARDWARE
       This version has only been tested with a few scanner models. Please see
       http://www.sane-project.org/sane-supported-devices.html	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.

OPTIONS
       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
	      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
       machines to have similar capabilities. Please note that these  features
       are  somewhat  simplistic,  and	may  not perform as well as the native
       implementations. Note also that these features  all  require  that  the
       driver  cache  the  entire  image in memory. This will almost certainly
       result in a reduction of scanning speed.

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

       swdeskew
	      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  options
       may  be	settable  only	when  another  option  has  been set, and that
       advanced options may be hidden by some frontend programs.

CONFIGURATION FILE
       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 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
	      commands.

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

ENVIRONMENT
       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

KNOWN ISSUES
       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
       unknown.

CREDITS
       The various authors of the sane-fujitsu backend provided useful code
       Yabarana Corp. www.yabarana.com provided significant funding
       EvriChart, Inc. www.evrichart.com provided funding and loaned equipment
       Canon, USA. www.usa.canon.com loaned equipment
       HPrint hprint.com.br provided funding and testing for DR-2510 support
       Stone-IT www.stone-it.com provided funding for DR-2010 and DR-2050 sup‐
       port
       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.

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

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

				  31 Aug 2015		      sane-canon_dr(5)
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