Thanks for the pointers, and the welcome, both of you.

But I'm still floundering: I already have good, correct, 16 bit data, for the
areas I want to render. I need to find software that will convert into the TGA
format or a single channel 16 bit PGM (or, at the very least, extract the most
significant bit and least significant bit, so I can put them into a tga image).

I can work a long, tedious hack that can achieve this, I think, but if there's
software that can do the trick.

What's bothering me at the moment is that I feel that I already have a 16 bit
PGM, and POV is merely taking the least significant bit and rendering that,
leaving me with everything peaking at 256 meters.

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