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+.TH sane\-canon630u 5 "11 Jul 2008"  "" "SANE Scanner Access Now Easy"
+.IX sane\-canon630u
+.SH NAME
+sane\-canon630u \- SANE backend for the Canon 630u USB flatbed scanner
+.SH DESCRIPTION
+The
+.B sane\-canon630u
+library implements a SANE (Scanner Access Now Easy) backend that
+provides access to the following Canon flatbed scanners:
+.PP
+.RS
+CanoScan 630u
+.br
+CanoScan 636u
+.br
+.RE
+.PP
+Color scanning is supported at 75, 150, 300, and 600 dpi, and gamma and
+analog gain are adjustable.
+.PP
+TESTERS ARE WELCOME. Send your bug reports and comments to
+Nathan Rutman
+.IR <nthn1@yahoo.com> .
+.PP
+.SH CONFIGURATION
+The contents of the
+.I canon630u.conf
+file is a list of device names that correspond to Canon
+USB scanners.  Empty lines and lines starting with a hash mark (#) are
+ignored.  Only one device name can be listed in
+.IR canon630u.conf .
+The program
+.BR sane\-find\-scanner (1)
+helps to find out the correct device. Under Linux, such a device name
+could be
+.I /dev/usb/scanner0
+for example.  See
+.BR sane\-usb (5)
+for details.
+.PP
+This product-specific scanner driver uses the lower-level kernel USB driver
+"scanner".  Check for "Driver=usbscanner" under
+.IR /proc/bus/usb/devices .
+If "Driver=(none)", try forcing it with
+.I "insmod scanner vendor=0x04a9 product=0x2204"
+.SH NOTES
+.PP
+Due to Canon's unwillingness to provide scanner documentation, this
+software was developed by analyzing the USB traffic of the Windows
+2000 driver.  So things like the calibration procedure I kind of made up;
+it seems to work for my scanner.  If you have complaints, let me know.
+.PP
+This driver requires the ability to send USB Control Messages, available in
+kernel 2.4.12 or later.
+.PP
+Some users have reported that this driver doesn't work at all.  This seems
+to be a hardware specific issue, although I dsane\-uson't know what exactly the
+problem is.  If you are having problems, please send me the info in
+.IR /proc/bus/usb/devices ,
+.IR /proc/pci ,
+the kernel
+.I scanner.c
+driver version from
+.IR /var/log/messages ,
+and the output from
+.I "SANE_DEBUG_CANON630U=12 scanimage > /dev/null"
+.PP
+.SH FILES
+.TP
+.I /etc/sane.d/canon630u.conf
+The backend configuration file (see also description of
+.B SANE_CONFIG_DIR
+below).
+.TP
+.I /usr/lib64/sane/libsane\-canon630u.a
+The static library implementing this backend.
+.TP
+.I /usr/lib64/sane/libsane\-canon630u.so
+The shared library implementing this backend (present on systems that
+support dynamic loading).
+.TP
+.I /tmp/canon.cal
+The calibration file used to normalize pixel brightness.  This is
+calculated every time the scanner is first used after it has lost power.
+Deleting this file will force recalibration.
+.SH ENVIRONMENT
+.TP
+.B SANE_CONFIG_DIR
+This environment variable specifies the list of directories that may
+contain the configuration file. On *NIX systems, the directories are
+separated by a colon (`:'), under OS/2, they are separated by a
+semi-colon (`;').  If this variable is not set, the configuration file
+is searched in two default directories: first, the current working
+directory (".") and then in
+.IR /etc/sane.d .
+If the value of the environment variable ends with the directory
+separator character, then the default directories are searched after
+the explicitly specified directories.  For example, setting
+.B SANE_CONFIG_DIR
+to "/tmp/config:" would result in directories
+.IR tmp/config ,
+.IR . ,
+and
+.I /etc/sane.d
+being searched (in this order).
+.TP
+.B SANE_DEBUG_CANON630U
+If the library was compiled with debug support enabled, this
+environment variable controls the debug level for this backend.  Higher
+debug levels increase the verbosity of the output.
+
+Example:
+.br
+SANE_DEBUG_CANON630U=12 scanimage > /dev/null
+.SH "SEE ALSO"
+.BR sane (7),
+.BR sane\-usb (5),
+.BR sane\-find\-scanner (1)
+.br
+.I http://canon-fb630u.sourceforge.net/
+.br
+.SH AUTHOR
+Nathan Rutman