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<TITLE>sane-canon_dr.5</TITLE>
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<BODY BGCOLOR=#FFFFFF TEXT=#000000><H1 ALIGN=CENTER><IMG SRC="/images/sane.png" HEIGHT=117 WIDTH=346></H1>
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<H1>sane-canon_dr.5</H1>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<B><A HREF="sane-canon_dr.5.html">sane-canon_dr(5)</A></B> SANE Scanner Access Now Easy <B><A HREF="sane-canon_dr.5.html">sane-canon_dr(5)</A></B>
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</PRE>
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<H2>NAME</H2><PRE>
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sane-canon_dr - SANE backend for Canon DR-series scanners
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The <B>sane-canon_dr</B> library implements a SANE (Scanner Access Now Easy)
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backend which provides access to some Canon DR-series scanners.
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This document describes backend version 60, which shipped with SANE
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1.0.32.
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</PRE>
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<H2>SUPPORTED HARDWARE</H2><PRE>
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This version has only been tested with a few scanner models. Please see
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<I>http://www.sane-project.org/sane-supported-devices.html</I> for the most
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recent list.
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This backend may support other Canon scanners. The best way to deter-
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mine level of support is to test the scanner directly, or to collect a
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trace of the windows driver in action. Please contact the author for
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help or with test results.
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In general, the larger machines (DR-4000 and up) which have been tested
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use a fairly complete protocol, with hardware support for many modes,
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resolutions and features. The smaller machines have many limitations,
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like missing horizontal resolutions, missing binary mode, always scan-
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ning full-width, etc. There is code in the backend to address these
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problems, but there seems to be no way to detect if they are required,
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so they must be hard-coded.
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</PRE>
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<H2>OPTIONS</H2><PRE>
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Effort has been made to expose most hardware options, including:
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<B>--source</B> <B>Flatbed|ADF</B> <B>Front|ADF</B> <B>Back|ADF</B> <B>Duplex</B>
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Selects the source for the scan.
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<B>--mode</B> <B>Lineart|Halftone|Gray|Color</B>
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Selects the mode for the scan.
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<B>--resolution</B>
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Controls scan resolution.
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<B>--tl-x,</B> <B>--tl-y,</B> <B>--br-x,</B> <B>--br-y</B>
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Sets scan area upper left and lower right coordinates. These are
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renamed <B>-t</B>, <B>-l</B>, <B>-x</B>, <B>-y</B> by some frontends.
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<B>--page-width,</B> <B>--page-height</B>
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Sets paper size. Used by scanner to determine centering of scan
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coordinates when using the ADF (Automatic Document Feeder) and
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to detect double feed errors.
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Other options will be available based on the capabilities of the scan-
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ner: enhancement, compression, buttons and sensors, etc.
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Additionally, several 'software' options are exposed by the backend.
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These are reimplementations of features provided natively by larger
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scanners, but running on the host computer. This enables smaller
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machines to have similar capabilities. Please note that these features
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are somewhat simplistic, and may not perform as well as the native
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implementations. Note also that these features all require that the
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driver cache the entire image in memory. This will almost certainly
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result in a reduction of scanning speed.
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<B>--swcrop</B>
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Requests the driver to detect the extremities of the paper
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within the larger image, and crop the empty edges.
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<B>--swdeskew</B>
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Requests the driver to detect the rotation of the paper within
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the larger image, and counter the rotation.
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<B>--swdespeck</B> <B>X</B>
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Requests the driver to find and remove dots of X diameter or
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smaller from the image, and fill the space with the average sur-
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rounding color.
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Use 'scanimage --help' to get a list, but be aware that some
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options may be settable only when another option has been set,
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and that advanced options may be hidden by some frontend pro-
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grams.
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</PRE>
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<H2>CONFIGURATION FILE</H2><PRE>
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The configuration file <I>canon</I><B>_</B><I>dr.conf</I> is used to tell the backend how to
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look for scanners, and provide options controlling the operation of the
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backend. This file is read each time the frontend asks the backend for
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a list of scanners, generally only when the frontend starts. If the
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configuration file is missing, the backend will fail to run.
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Scanners can be specified in the configuration file in 4 ways:
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"scsi CANON DR"
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Requests backend to search all scsi buses in the system for a
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device which reports itself to be a scanner made by 'CANON',
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with a model name starting with 'DR'.
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"scsi /dev/sg0" (or other scsi device file)
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Requests backend to open the named scsi device. Only useful if
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you have multiple compatible scanners connected to your system,
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and need to specify one. Probably should not be used with the
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other "scsi" line above.
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"usb 0x04a9 0x1603" (or other vendor/product ids)
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Requests backend to search all usb buses in the system for a
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device which uses that vendor and product id. The device will
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then be queried to determine if it is a Canon scanner.
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"usb /dev/usb/scanner0" (or other device file)
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Some systems use a kernel driver to access usb scanners. This
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method is untested.
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Besides the 'scsi' and 'usb' lines, the configuration file supports the
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following 'option' lines:
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"option buffer-size [number of bytes]"
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Set the number of bytes in the data buffer to something other
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than the compiled-in default of 4MB. Large values may cause
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timeouts or hangs, small values may cause slow scans.
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Note: The backend does not place an upper bound on this value,
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as some users required it to be quite large. Values above the
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default are not recommended, and may crash your OS or lockup
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your scsi card driver. You have been warned.
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"option vendor-name [string of text]"
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"option model-name [string of text]"
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"option version-name [string of text]"
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These options can be used collectively to override the values
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provided by the scanner, or to provide the values when the scan-
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ner cannot.
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"option padded-read [0|1]"
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Some scanners prepend all data transmitted to host with 12
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bytes. Enable this option if the scanner fails to respond to
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commands.
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"option duplex-offset [integer]"
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Some scanners pad the upper edge of one side of a duplex scan.
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There is some variation in the amount of padding. Modify this
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option if your unit shows an unwanted band of image data on only
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one side.
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<B>NOTE</B>: "option" lines may appear multiple times in the configuration
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file. They only apply to scanners discovered by the next 'scsi/usb'
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line.
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</PRE>
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<H2>ENVIRONMENT</H2><PRE>
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The backend uses a single environment variable, <B>SANE_DEBUG_CANON_DR</B>,
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which enables debugging output to stderr. Valid values are:
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5 Errors
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10 Function trace
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15 Function detail
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20 Option commands
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25 SCSI/USB trace
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30 SCSI/USB detail
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35 Useless noise
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</PRE>
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<H2>KNOWN ISSUES</H2><PRE>
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This backend was entirely reverse engineered from usb traces of the
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proprietary driver. Various advanced features of the machines may not
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be enabled. Many machines have not been tested. Their protocol is
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unknown.
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</PRE>
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<H2>CREDITS</H2><PRE>
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The various authors of the <B><A HREF="sane-fujitsu.5.html">sane-fujitsu(5)</A></B> backend provided useful
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code.
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Yabarana Corp. <I>www.yabarana.com</I> provided significant funding.
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EvriChart, Inc. <I>www.evrichart.com</I> provided funding and loaned equip-
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ment.
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Canon, USA. <I>www.usa.canon.com</I> loaned equipment.
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HPrint <I>hprint.com.br</I> provided funding and testing for DR-2510 support.
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Stone-IT <I>www.stone-it.com</I> provided funding for DR-2010 and DR-2050 sup-
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port.
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Gerhard Pfeffer provided access and testing for P-208 and P-215.
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Special thanks to: Alejandro Imass, Andre Shimakawa, Martijn van Brum-
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melen, Thanos Diacakis and Junren Shi for testing and feedback.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<B><A HREF="sane.7.html">sane(7)</A></B>, <B><A HREF="sane-scsi.5.html">sane-scsi(5)</A></B>, <B>sane-usb(5)</B>
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</PRE>
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<H2>AUTHOR</H2><PRE>
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m. allan noah: <I><kitno455</I> <I>a</I> <I>t</I> <I>gmail</I> <I>d</I> <I>o</I> <I>t</I> <I>com></I>.
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13 Feb 2021 <B><A HREF="sane-canon_dr.5.html">sane-canon_dr(5)</A></B>
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</PRE>
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