Have you considered writing the data out as a mesh2?  Since you're 
writing a C++ program anyway, it's probably a lot easier to write a few 
floating point numbers out in text format than to write out a specific 
image file format.  Plus you get to have a greater degree of precision 
than with a 16 bit image file.  Also you can control the mesh smoothing 
if you calculate a few normal vectors.

I wrote a C++ program (win32 command line) that takes a raw 32bit 
floating point output file from World Machine, calculates the mesh, does 
a non linear transform (cylindrical wrapping), calculates the normal 
vectors, then spits out a mesh.  Email me if you'd like the source and 
you can feel free to use it however you like.

Peter D.

scott wrote:
> I'm writing some code in C++ (on windows) to generate some 16-bit height
> field data.  What is going to be the easiest way for me to export the
> numbers to use in POV?  The PNG file format looks pretty complex (compared
> to BMP which is what I'm used to).
> 
> Is there any way to make POV use red+256*green or something like that from a
> BMP file?  Or some software that will make red+256*green into 16-bit grey
> PNG?
> 
> Thanks
> 
> Scott
> 
>

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