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+.TH sane\-canon_dr 5 "16 Sep 2013" "@PACKAGEVERSION@" "SANE Scanner Access Now Easy"
+.IX sane\-canon_dr
+
+.SH NAME
+sane\-canon_dr \- SANE backend for Canon DR-series scanners
+
+.SH DESCRIPTION
+The 
+.B 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 41, which shipped with SANE 1.0.24.
+
+.SH 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 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.
+
+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 scanning 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.
+
+.SH OPTIONS
+Effort has been made to expose most hardware options, including:
+.PP
+source s 
+.RS
+Selects the source for the scan. Options
+may include "Flatbed", "ADF Front", "ADF Back", "ADF Duplex".
+.RE
+.PP
+mode m 
+.RS
+Selects the mode for the scan. Options
+may include "Lineart", "Halftone", "Gray", and "Color".
+.RE
+.PP
+resolution 
+.RS
+Controls scan resolution.
+.RE
+.PP
+tl\-x, tl\-y, br\-x, br\-y
+.RS
+Sets scan area upper left and lower right coordinates. These are renamed 
+t, l, x, y by some frontends.
+.RE
+.PP
+page\-width, page\-height
+.RS
+Sets paper size. Used by scanner to determine centering of scan
+coordinates when using ADF and to detect double feed errors.
+.RE
+.PP
+Other options will be available based on the capabilities of the scanner:
+enhancement, compression, buttons and sensors, etc.
+.PP
+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.
+.PP
+swcrop 
+.RS
+Requests the driver to detect the extremities of the paper within the larger 
+image, and crop the empty edges. 
+.RE
+.PP
+swdeskew 
+.RS
+Requests the driver to detect the rotation of the paper within the larger 
+image, and counter the rotation.
+.RE
+.PP
+swdespeck X 
+.RS
+Requests the driver to find and remove dots of X diameter or smaller from the 
+image, and fill the space with the average surrounding color.
+.RE
+
+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.
+.PP
+.SH 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.
+.PP
+Scanners can be specified in the configuration file in 4 ways:
+.PP
+"scsi CANON DR"
+.RS
+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'. 
+.RE
+.PP
+"scsi /dev/sg0" (or other scsi device file)
+.RS
+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.
+.RE
+.PP
+"usb 0x04a9 0x1603" (or other vendor/product ids)
+.RS
+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.
+.RE
+.PP
+"usb /dev/usb/scanner0" (or other device file)
+.RS
+Some systems use a kernel driver to access usb scanners. This method is untested.
+.RE
+.PP
+Besides the 'scsi' and 'usb' lines, the configuration file supports the 
+following 'option' lines:
+.PP
+"option buffer-size [number of bytes]"
+.RS
+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.
+.PP
+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.
+.RE
+.PP
+"option vendor-name [string of text]"
+.br
+"option model-name [string of text]"
+.br
+"option version-name [string of text]"
+.RS
+These options can be used collectively to override the values provided by the 
+scanner, or to provide the values when the scanner cannot.
+.RE
+.PP
+"option padded-read [0|1]"
+.RS
+Some scanners prepend all data transmitted to host with 12 bytes. Enable this option if the scanner fails to respond to commands.
+.RE
+.PP
+"option duplex-offset [integer]"
+.RS
+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.
+.RE
+.PP
+Note: 'option' lines may appear multiple times in the configuration file.
+They only apply to scanners discovered by the next 'scsi/usb' line.
+.PP
+
+.SH ENVIRONMENT
+The backend uses a single environment variable, SANE_DEBUG_CANON_DR, which
+enables debugging output to stderr. Valid values are:
+.PP
+.RS
+5  Errors
+.br
+10 Function trace
+.br
+15 Function detail
+.br
+20 Option commands
+.br
+25 SCSI/USB trace
+.br
+30 SCSI/USB detail
+.br
+35 Useless noise
+.RE
+
+.SH 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.
+
+.SH CREDITS
+  
+The various authors of the sane\-fujitsu backend provided useful code
+.br
+Yabarana Corp. www.yabarana.com provided significant funding
+.br
+EvriChart, Inc. www.evrichart.com provided funding and loaned equipment
+.br
+Canon, USA. www.usa.canon.com loaned equipment
+.br
+HPrint hprint.com.br provided funding and testing for DR-2510 support
+.br
+Stone-IT www.stone-it.com provided funding for DR-2010 and DR-2050 support
+.br
+Gerhard Pfeffer provided access and testing for P-208 and P-215
+.br
+Special thanks to: Alejandro Imass, Andre Shimakawa, Martijn van Brummelen, Thanos Diacakis and Junren Shi for testing and feedback.
+
+.SH "SEE ALSO"
+sane(7),
+sane\-scsi(5),
+sane\-usb(5)
+
+.SH AUTHOR
+m. allan noah: <kitno455 a t gmail d o t com>
+