It seems POV-Ray has problems reading ppm-files it has generated itself.

- ppm-files generated with +fp commandline-switch and a value between 0 
and 13 cannot be used in an imagemap. It results is an error:

   Parse Error: Unsupported number of colors (0) in PPM image.


- If the value for +fp is in the range 14-16, it can be used in an 
imagemap, but the result is garbled.

More info, demo scene and confirmation can be found in the tread:

Newsgroups: povray.general
Subject: ppm troubles
From: ingo <ing### [at] tagpovrayorg>
Message-ID: <Xns### [at] povrayorg>
Date: 26 Dec 2002 13:15:36 -0500
Xref: news.povray.org povray.general:44242
and/or
http://news.povray.org/povray.general/29449/

Ingo

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