Ran into this before, long time ago, still confused.
'd like to write 16 bit greyscale files from an array[][] to use them in 
a hight-field (in the same scene).
Tried different packages to generate .pgm's, many won't work. Some do 
and it seems POV-Ray can use 16 bit greyscale pgm's for HF's despite 
what the docs say.

What would be the exact form of 16 bit pgm's that POV-Ray supports?

Ingo (...and if somebody has a macro ...)

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