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+.TH sane\-pint 5 "14 Jul 2008" "@PACKAGEVERSION@" "SANE Scanner Access Now Easy"
+.IX sane\-pint
+.SH NAME
+sane\-pint \- SANE backend for scanners that use the PINT device driver
+.SH DESCRIPTION
+The
+.B sane\-pint
+library implements a SANE (Scanner Access Now Easy) backend that
+provides generic access to hand-held and flatbed scanners using the
+PINT (PINT Is Not Twain) device driver.  The PINT driver is being
+actively developed on the OpenBSD platform, and has been ported to a
+few other *nix-like operating systems.
+.PP
+PINT is designed to provide an
+.BR ioctl (2)
+interface to many different scanner types.  However, this backend has
+only been tested with flatbed single-pass scanners, and more work will
+probably be required to get it to use other scanner types
+successfully.
+.PP
+If have successfully used the PINT driver with your scanner, but it
+does not work using this SANE backend, please let us know.  To do
+this, send a mail with the relevant information for your scanner to
+.IR sane\-devel@lists.alioth.debian.org .
+Have a look at http://www.sane\-project.org/mailing\-lists.html concerning subscription
+to sane\-devel.
+
+.SH "DEVICE NAMES"
+This backend expects device names of the form:
+.PP
+.RS
+.I special
+.RE
+.PP
+Where
+.I special
+is the UNIX path-name for the special device that corresponds to the
+scanner.  The special device name must be a PINT device or a symlink
+to such a device.  For example, under NetBSD or OpenBSD, such a device
+name could be
+.I /dev/ss0
+or
+.IR /dev/scan0 .
+.SH CONFIGURATION
+The contents of the
+.IR pint.conf .
+file is a list of device names that correspond to PINT
+scanners.  Empty lines and lines starting with a hash mark (#) are
+ignored.  A sample configuration file is shown below:
+.PP
+.RS
+/dev/scanner
+.br
+# this is a comment
+.br
+/dev/ss1
+.RE
+.SH FILES
+.TP
+.I @CONFIGDIR@/pint.conf
+The backend configuration file (see also description of
+.B SANE_CONFIG_DIR
+below).
+.TP
+.I @LIBDIR@/libsane\-pint.a
+The static library implementing this backend.
+.TP
+.I @LIBDIR@/libsane\-pint.so
+The shared library implementing this backend (present on systems that
+support dynamic loading).
+.SH ENVIRONMENT
+.TP
+.B SANE_CONFIG_DIR
+This environment variable specifies the list of directories that may
+contain the configuration file.  Under UNIX, 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 @CONFIGDIR@.  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 "tmp/config", ".", and
+"@CONFIGDIR@" being searched (in this order).
+.TP
+.B SANE_DEBUG_PINT
+If the library was compiled with debug support enabled, this
+environment variable controls the debug level for this backend.  E.g.,
+a value of 128 requests all debug output to be printed.  Smaller
+levels reduce verbosity.
+.SH SEE ALSO
+sane(7)
+.SH AUTHOR
+Gordon Matzigkeit, adapted from existing backends written by David
+Mosberger.
+.SH BUGS
+
+There are minor roundoff errors when adjusting the ranges, since
+PINT uses units of 1/1200 of an inch, and SANE normally uses
+millimeters.  Symptoms of these errors are skewed images.  This should
+really be fixed (no pun intended) as soon as possible, but I just
+don't know/care enough about fixed-point representation and roundoff
+errors to do this correctly.  Workaround: use inches as the scanning
+unit, and everything usually works fine.
+
+The PINT 0.5e interface does not provide a way to determine valid
+ranges for DPI, modes, and scan sizes.  So, the SANE backend queries
+the PINT device, and dynamically discovers valid ranges by doing a
+binary search.  This means that the driver takes longer to initialize
+than seems necessary.
+
+Resetting the scanner does not seem to work (at least not on my HP
+ScanJet 4p).  For that reason, the driver sends a SCIOCRESTART, then
+gobbles up any remaining input until it hits EOF.
+
+Not all of the scanners have been identified (i.e. whether they are
+flatbed or handheld).
+
+X and Y resolutions are assumed to be the same.
+
+No testing has been done on three-pass or handheld scanners, or with
+Automatic Document Feeder support.