> Hello,
>
> This is an old scene with some slight improvements. Getting the rainbow gradient
> right is tricky. Making a mathematically linear gradient doesn't seem to give
> visually linear results. The primary colors appear to dominate the secondary
> colors, causing uneven transitions. This scene uses a partial fix but it's still
> not perfect. I have seen what appear to be perfectly balanced rainbow gradients
> before - does anybody know the trick to getting it just right?
>
> Regards,
> Dave Blandston

A simple way: Add some more intermediate tints to your colour_map.

If you need, say, the green to be visualy narower, shift the neiboring 
entries closer a bit.



Alain

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