> Ahh!!! Now I get it. It is not the function itself, it is the range
> of the color_map that limits to the 0..1 range. Of course. So Jaimes
> min() makes perfectly sense and your solution overcomes this
> limitation.

   So, this seems to confirm my guess that dot-artifacts are caused by
the image interpolation returning values greater than 1, isn't? Somehow
this doesn't shows on direct usage, but only when the interpolated
images are used in functions... time to file the bug report, I guess.

-- 
Jaime Vives Piqueres
		
La Persistencia de la Ignorancia
http://www.ignorancia.org

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