Yes, there are a lot of things broken about ppm/pgm support in 3.5.  Until
now i found:

- comments are not allowed *before* the width and height values in either
pgm or ppm.  
- ppm reading support strongly broken (problems with the 'depth' value)
- continued trace of ppm does not work
- 16 bit binary pgm not supported although allowed in pgm specs (this has
never been supported though)

Parts of it have already been reported in:

Subject: ppm bug
Date: 28 Dec 2002 10:16:11 -0500
From: ingo <ing### [at] tagpovrayorg>
Reply-To: ing### [at] tagpovrayorg
To: bug### [at] povrayorg
Newsgroups: povray.bugreports

Christoph

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