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Description
It would be nice to have the option of using a logarithmic (instead of linear) mapping for the color scale. E.g. see map at http://en.wikipedia.org/wiki/Logarithmic_scale#Graphic_representation
A logarithmic scale makes it easier to see and compare ratio relationships (instead of interval relationships) over a large data range.
I think this could be implemented either in the drawing of the alphamap, or in the mapping of the alphamap value to the color map.
I would be willing to do some implementation on this, if I can get over the git hurdles.