1sane-canon_dr(5) SANE Scanner Access Now Easy sane-canon_dr(5)
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6 sane-canon_dr - SANE backend for Canon DR-series scanners
7
10 The sane-canon_dr library implements a SANE (Scanner Access Now Easy)
11 backend which provides access to some Canon DR-series scanners.
12 This document describes backend version 51, which shipped with SANE
14 1.0.25.
15
18 This version has only been tested with a few scanner models. Please see
19 http://www.sane-project.org/sane-supported-devices.html for the most
20 recent list.
21 This backend may support other Canon scanners. The best way to deter‐
23 mine level of support is to test the scanner directly, or to collect a
24 trace of the windows driver in action. Please contact the author for
25 help or with test results.
26 In general, the larger machines (DR-4000 and up) which have been tested
28 use a fairly complete protocol, with hardware support for many modes,
29 resolutions and features. The smaller machines have many limitations,
30 like missing horizontal resolutions, missing binary mode, always scan‐
31 ning full-width, etc. There is code in the backend to address these
32 problems, but there seems to be no way to detect if they are required,
33 so they must be hard-coded.
34
37 Effort has been made to expose most hardware options, including:
38 source s
40 Selects the source for the scan. Options may include "Flatbed",
41 "ADF Front", "ADF Back", "ADF Duplex".
42 mode m
44 Selects the mode for the scan. Options may include "Lineart",
45 "Halftone", "Gray", and "Color".
46 resolution
48 Controls scan resolution.
49 tl-x, tl-y, br-x, br-y
51 Sets scan area upper left and lower right coordinates. These are
52 renamed t, l, x, y by some frontends.
53 page-width, page-height
55 Sets paper size. Used by scanner to determine centering of scan
56 coordinates when using ADF and to detect double feed errors.
57 Other options will be available based on the capabilities of the scan‐
59 ner: enhancement, compression, buttons and sensors, etc.
60 Additionally, several 'software' options are exposed by the backend.
62 These are reimplementations of features provided natively by larger
63 scanners, but running on the host computer. This enables smaller
64 machines to have similar capabilities. Please note that these features
65 are somewhat simplistic, and may not perform as well as the native
66 implementations. Note also that these features all require that the
67 driver cache the entire image in memory. This will almost certainly
68 result in a reduction of scanning speed.
69 swcrop
71 Requests the driver to detect the extremities of the paper
72 within the larger image, and crop the empty edges.
73 swdeskew
75 Requests the driver to detect the rotation of the paper within
76 the larger image, and counter the rotation.
77 swdespeck X
79 Requests the driver to find and remove dots of X diameter or
80 smaller from the image, and fill the space with the average sur‐
81 rounding color.
82 Use 'scanimage --help' to get a list, but be aware that some options
84 may be settable only when another option has been set, and that
85 advanced options may be hidden by some frontend programs.
86
88 The configuration file "canon_dr.conf" is used to tell the backend how
89 to look for scanners, and provide options controlling the operation of
90 the backend. This file is read each time the frontend asks the backend
91 for a list of scanners, generally only when the frontend starts. If the
92 configuration file is missing, the backend will fail to run.
93 Scanners can be specified in the configuration file in 4 ways:
95 "scsi CANON DR"
97 Requests backend to search all scsi busses in the system for a
98 device which reports itself to be a scanner made by 'CANON',
99 with a model name starting with 'DR'.
100 "scsi /dev/sg0" (or other scsi device file)
102 Requests backend to open the named scsi device. Only useful if
103 you have multiple compatible scanners connected to your system,
104 and need to specify one. Probably should not be used with the
105 other "scsi" line above.
106 "usb 0x04a9 0x1603" (or other vendor/product ids)
108 Requests backend to search all usb busses in the system for a
109 device which uses that vendor and product id. The device will
110 then be queried to determine if it is a Canon scanner.
111 "usb /dev/usb/scanner0" (or other device file)
113 Some systems use a kernel driver to access usb scanners. This
114 method is untested.
115 Besides the 'scsi' and 'usb' lines, the configuration file supports the
117 following 'option' lines:
118 "option buffer-size [number of bytes]"
120 Set the number of bytes in the data buffer to something other
121 than the compiled-in default of 4MB. Large values may cause
122 timeouts or hangs, small values may cause slow scans.
123 Note: The backend does not place an upper bound on this value,
125 as some users required it to be quite large. Values above the
126 default are not recommended, and may crash your OS or lockup
127 your scsi card driver. You have been warned.
128 "option vendor-name [string of text]"
130 "option model-name [string of text]"
131 "option version-name [string of text]"
132 These options can be used collectively to override the values
133 provided by the scanner, or to provide the values when the scan‐
134 ner cannot.
135 "option padded-read [0|1]"
137 Some scanners prepend all data transmitted to host with 12
138 bytes. Enable this option if the scanner fails to respond to
139 commands.
140 "option duplex-offset [integer]"
142 Some scanners pad the upper edge of one side of a duplex scan.
143 There is some variation in the amount of padding. Modify this
144 option if your unit shows an unwanted band of image data on only
145 one side.
146 Note: 'option' lines may appear multiple times in the configuration
148 file. They only apply to scanners discovered by the next 'scsi/usb'
149 line.
150
152 The backend uses a single environment variable, SANE_DEBUG_CANON_DR,
153 which enables debugging output to stderr. Valid values are:
154 5 Errors
156 10 Function trace
157 15 Function detail
158 20 Option commands
159 25 SCSI/USB trace
160 30 SCSI/USB detail
161 35 Useless noise
162
165 This backend was entirely reverse engineered from usb traces of the
166 proprietary driver. Various advanced features of the machines may not
167 be enabled. Many machines have not been tested. Their protocol is
168 unknown.
169
172 The various authors of the sane-fujitsu backend provided useful code
173 Yabarana Corp. www.yabarana.com provided significant funding
174 EvriChart, Inc. www.evrichart.com provided funding and loaned equipment
175 Canon, USA. www.usa.canon.com loaned equipment
176 HPrint hprint.com.br provided funding and testing for DR-2510 support
177 Stone-IT www.stone-it.com provided funding for DR-2010 and DR-2050 sup‐
178 port
179 Gerhard Pfeffer provided access and testing for P-208 and P-215
180 Special thanks to: Alejandro Imass, Andre Shimakawa, Martijn van Brum‐
181 melen, Thanos Diacakis and Junren Shi for testing and feedback.
182
185 sane(7), sane-scsi(5), sane-usb(5)
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189 m. allan noah: <kitno455 a t gmail d o t com>
190 31 Aug 2015 sane-canon_dr(5)