>   From http://povray.org/documentation/view/3.6.1/279/
>
> "The TGA and PPM file formats may be used as a storage device for 16
> bit numbers rather than an image file. These formats use the red and
> green bytes of each pixel to store the high and low bytes of a height
> value."
>
>   The raw TGA file format is extremely simple. It has a 18-byte header
> (which format is fixed) and then the raw image data.

Thanks, raw TGA is exactly what I need.  Cheers.

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