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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ppmrough User Manual</title></head>
<body>
<h1>ppmrough</h1>
Updated: 20 August 2023
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ppmrough - create PPM image of a single color rectangle with ragged edges on a
different color background
<h2 id="synopsis">SYNOPSIS</h2>
<b>ppmrough</b>
[<b>-left </b><i>pixels</i>]
[<b>-right </b><i>pixels</i>]
[<b>-top </b><i>pixels</i>]
[<b>-bottom </b><i>pixels</i>]
[<b>-width </b><i>pixels</i>]
[<b>-height </b><i>pixels</i>]
[<b>-bg </b><i>colorspec</i>]
[<b>-fg </b><i>colorspec</i>]
[<b>-var </b><i>pixels</i>]
[<b>-randomseed </b><i>seed</i>]
[<b>-verbose</b>]
<p>All options can be abbreviated to their shortest unique prefix.
You may use two hyphens instead of one. You may separate an option
name and its value with white space instead of an equals sign.
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmrough</b> generates a PPM image of the specified width and height.
The image consists of a rectangle of the specified foreground color
surrounded by borders of the specified size and background color, except
that the boundary between the foreground rectangle and the borders is
ragged. The ragged effect is random.
<p><b>ppmrough</b> writes the PPM image to Standard Output.
<p>The maxval of the output image is 255 (You can change this with
<b>pamdepth</b>).
<p>Use the options <b>-left</b> or <b>-right</b>, respectively, to make
vertical borders, and <b>-top</b> or <b>-bottom</b>, respectively, to generate
horizontal borders inside the image. The value of each of these options is
the minimum width of the border on that edge. Beyond that minimum, the width
at any given location on that edge is random, varying along the edge in a
fractal kind of way.
<p>Use the <b>-var</b> option to control the "raggedness" of
the border. The lower its value, the smoother the border is. You
can initialize the pseudo-random generator with the <b>-init</b>
option.
<p>You could use <b>ppmrough</b> with <b>ppmtopgm</b> to create a PGM
transparency mask and use it to roughen up the edges of another image.
<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>ppmrough</b> recognizes the following
command line options:
<dl compact>
<dt><b>-width=</b><i>pixels</i>
<dd>This specifies the width of the image in pixels (default: 100).
<dt><b>-height=</b><i>pixels</i>
<dd>This specifies the height of the image in pixels (default: 100).
<dt><b>-left=</b><i>pixels</i>
<dt><b>-right=</b><i>pixels</i>
<dt><b>-top=</b><i>pixels</i>
<dt><b>-bottom=</b><i>pixels</i>
<dd>This option causes the program to create a left, right, top, or bottom
border, respectively, at least <i>pixels</i> pixels wide, varying randomly
beyond that. You may specify any combination of these.
<dt><b>-bg=</b><i>colorspec</i>
<dd>This is the background color, i.e. the color of the
borders. <i>colorspec</i> is as described for the
<a href="libnetpbm_image.html#colorname">argument of the
<b>pnm_parsecolor()</b> library routine</a>. Default is black.
<dt><b>-fg=</b><i>color</i>
<dd>This specifies the foreground color, i.e. the color of the center of the
mage -- everything but the borders. <i>colorspec</i> is as described for the
<a href="libnetpbm_image.html#colorname">argument of the
<b>pnm_parsecolor()</b> library routine</a>. Default is white.
<dt><b>-var=</b><i>pixels</i>
<dd>This specifies how ragged the borders are -- how much and how quickly its
width varies along the image edge. Its specific meaning is complex, but the
larger it is, the more the border varies. Zero means it does not vary at all
-- the edge of the foreground is straight.
<p>This must be a nonnegative integer. The default is 10.
<dt><b>-randomseed=</b><i>seed</i>
<dd>Use this option to initialize the pseudo-random number generator
with <i>seed</i>.
<p>You can use this to cause the program to produce repeatable output.
<p>Before Netpbm 10.61 (December 2012), this is called <b>-init</b>,
and that still works.
<dt><b>-verbose</b>
<dd>Run <b>ppmrough</b> in verbose mode. It reports all parameters on
Standard Error.
</dl>
<h2 id="seealso">SEE ALSO</h2>
<b><a href="ppmmake.html">ppmmake</a></b>,
<b><a href="pamcat.html">pamcat</a></b>,
<b><a href="ppmtopgm.html">ppmtopgm</a></b>,
<b><a href="ppm.html">ppm</a></b>,
<h2 id="history">HISTORY</h2>
<p>
This program was added to Netpbm in Release 10.9 (September 2002).
<h2 id="author">AUTHOR</h2>
Copyright (C) 2002 by Eckard Specht.
<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="#seealso">SEE ALSO</a>
<li><a href="#history">HISTORY</a>
<li><a href="#author">AUTHOR</a>
</ul>
<hr>
</body>
</html>
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