>   I think that the PPM format is ascii, IIRC.

PPM comes in two variants: Originally it used to be just ascii,
so that pictures could be sent via email in the ancient days (or
something like that). Then people started to get annoyed by file
sizes of 12 bytes per pixel (for 8 bit depth) and the ,,packed''
variant was added. There only the header is pure ascii.

To my knowledge Povray outputs only packed ppm. So you would
have to convert that into unpacked.

If using Linux you should do
  man ppm
  man pnmtoplainpnm
  apropos ppm
  apropos pnm
for further information.

  Mark

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