A while ago when I was working with df3s. Both Alain and Clipka 
mentioned that df3s use grey levels not three channels of colour.
Tga2df3.exe creates RGB df3s (The utility Oosawa 4D Volume Viewer, can 
split them using only one of the channels).
How does PovRay's internal workings handle this, mathematically?
If PovRay reads a value of (say) <0.5, 0.7, 0.1> what density value 
would it give it?
Similarly for <0, 0.9, 0> or any other combination of colour components?


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Regards
     Stephen

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