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.\"
.\" Copyright (c) 2007-2014 Frank DENIS <j at pureftpd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: September 23 2007 $
.Dt PUZZLE-DIFF 1
.Os
.Sh NAME
.Nm puzzle\-diff
.Nd compare pictures with libpuzzle
.Sh SYNOPSIS
.Nm puzzle\-diff
[\-b <contrast barrier for cropping] [\-c] [\-C <max cropping ratio>]
[\-e] [\-E <similarity threshold>] [\-h] [\-H <max height>] [\-l <lambdas>]
[\-n <noise cutoff>] [\-p <p ratio>] [\-t] [\-W <max width>]
<file 1>
<file 2>
.Sh DESCRIPTION
puzzle\-diff compares two pictures and outputs the normalized distance.
.Pp
Try
.Em puzzle\-diff \-h
for more info.
.Sh EXAMPLES
Output distance between two images:
.Bd -literal -offset indent
$ puzzle\-diff pic\-a\-0.jpg pics\-a\-1.jpg
0.102286
.Ed
.Pp
Compare two images, exit with 10 if they look the same, exit with 20 if
they don't (may be useful for scripts):
.Bd -literal -offset indent
$ puzzle\-diff \-e pic\-a\-0.jpg pics\-a\-1.jpg
$ echo $?
10
.Ed
.Pp
Compute distance, without cropping and with computing the average intensity
of the whole blocks:
.Bd -literal -offset indent
$ puzzle\-diff \-p 1.0 \-c pic\-a\-0.jpg pic\-a\-1.jpg
0.0523151
.Ed
.Sh SEE ALSO
.Xr libpuzzle 3
.Xr puzzle_set 3
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