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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Pnmmontage User Manual</title></head>
<body>
<h1>pnmmontage</h1>
Updated: 22 November 2012
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
pnmmontage - create a montage of PNM images
<h2 id="synopsis">SYNOPSIS</h2>
<b>pnmmontage</b>
[<b>-header=</b><i>headerfile</i>]
[<b>-quality=</b><i>n</i>]
[<b>-prefix=</b><i>prefix</i>]
[<b>-0</b>|<b>-1</b>|<b>-2</b>|<b>...</b>|<b>-9</b>]
[<b>-data=</b><i>filename</i>]
<i>pnmfile</i>...
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pnmmontage</b> packs images of differing sizes into a minimum-area
composite image.
<p>Areas of the output that cannot be occupied by an image are black.
<h2 id="options">OPTIONS</h2>
<p>In addition to the options common to all programs based on libnetpbm
(most notably <b>-quiet</b>, see <a href="index.html#commonoptions">
Common Options</a>), <b>pnmmontage</b> recognizes the following
command line options:
<dl compact>
<dt><b>-data=</b><i>filename</i>
<dd>This option causes <b>pnmmontage</b> to write a file that describes
in machine-readable form the positions of the original images within
the packed image. Here is an example:
<pre>
<span style="font-family: monospace">
:0:0:227:298
../image1.ppm:0:0:227:149
../image2.ppm:0:149:227:149
</span>
</pre>
<p>There is a line for each component image and one for the composite.
<p>The 5 fields on each line are:
<ol>
<li>source image name (or null string indicating the line for the composite
image)
<li>Column number of upper left corner of the image
<li>Row number of upper left corner of the image
<li>width of the image (columns)
<li>height of the image (rows)
</ol>
<p>This option was new in Netpbm 10.6 (July 2002).
<dt><b>-header=</b><i>filename</i>
<dd>Tells <b>pnmmontage</b> to write a C header file of the locations
of the original images within the packed image. Each original image
generates four #defines within the packed file: xxxX, xxxY, xxxSZX,
and xxxSZY, where xxx is the name of the file, converted to all
uppercase. The output also includes #defines OVERALLX and OVERALLY, which
specifies the total size of the montage image.
<p>Here is an example:
<pre>
<code>
#define OVERALLX 227
#define OVERALLY 298
#define X 0
#define Y 0
#define SZX 227
#define SZY 149
#define X 0
#define Y 149
#define SZX 227
#define SZY 149
</code>
</pre>
<dt><b>-prefix</b>
<dd>Tells <b>pnmmontage</b> to use the specified prefix on all of the
#defines it generates.
<dt><b>-quality</b>
<dd>Before attempting to place the subimages, <b>pnmmontage</b> will
calculate a minimum possible area for the montage; this is either the
total of the areas of all the subimages, or the width of the widest
subimage times the height of the tallest subimage, whichever is
greater. <b>pnmmontage</b> then initiates a problem-space search to
find the best packing; if it finds a solution that is (at least) as
good as the minimum area times the quality as a percent, it will break
out of the search. Thus, <b>-quality=100</b> will find the best possible
solution; however, it may take a very long time to do so. The default
is <b>-quality=200.</b>
<dt><b>-0</b>, <b>-1</b>, ... <b>-9</b>
<dd>These options control the quality at a higher level than
<b>-quality</b>; <b>-0</b> is the worst quality (pick the first
solution found), while <b>-9</b> is the best quality (perform an
exhaustive search of problem space for the absolute best packing).
The higher the number, the slower the computation. The default is
<b>-5</b>.
</dl>
<h2 id="notes">NOTES</h2>
<p>Using <b>-9</b> is very slow on all but the smallest image sets.
<p>The minimum area arrangement is often not a convenient shape. For
example, it might be a tall, thin column of images, when you'd rather
have something more square. To force a minimum width or height, you
can include a strut image - a black image that wide and one pixel high.
Similarly, you can use a vertical strut to force a minimum height.
<h2 id="seealso">SEE ALSO</h2>
<b><a href="pamcat.html">pamcat</a></b>,
<b><a href="pnmindex.html">pnmindex</a></b>,
<b><a href="pnm.html">pnm</a></b>,
<b><a href="pam.html">pam</a></b>,
<b><a href="pbm.html">pbm</a></b>,
<b><a href="pgm.html">pgm</a></b>,
<b><a href="ppm.html">ppm</a></b>
<h2 id="history">HISTORY</h2>
<p><b>pnmmontage</b> was new in Netpbm 9.10 (January 2001).
<h2 id="author">AUTHOR</h2>
Copyright (C) 2000 by Ben Olmstead.
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#notes">NOTES</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#history">HISTORY</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
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