e filter parameters.
</p>


<h3><a name="PNM"></a>PNM</h3>

<p>The PNM (portable network map) family of formats are very simple
uncompressed image formats commonly used on unix-like systems. They
are particularly useful for testing or as input to an external conversion
utility.</p>

<p>A wide variety of data formats and depths is supported. Devices include
<tt>pbm
   pbmraw pgm pgmraw pgnm pgnmraw pnm pnmraw ppm ppmraw pkm pkmraw pksm
   pksmraw</tt>.
</p>

<h3><a name="TIFF"></a>TIFF file formats</h3>

<p>