> Thanks for the suggestion, but I don't think it will work.  I won't have just 3
> channels to combine (RGB).  Instead, I'll have 20 or 30 channels, spaced over
> the visible spectrum.  All 30 channels would have to be combined with
> appropriate weightings for the illumination source and eye responsivity to
> create a single RGB image.

I'm not entirely sure how your input data looks like,
but possibly you can do what you want in SDL by stacking
partially transparent or filtered image_maps on a box
and rendering this with an orthographic camera.

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