Well, after some more surfing I was lucky enough to end up with an article which
shows precisely what I mean. It is actually an article of clipka!

link: http://wiki.povray.org/content/User:Clipka/Gamma

The two grey colored pictures of a ball show the banding on the plane (and also
the ball itself) that I also have in my scene.

Unfortunately the suggestion of clipka to output to OpenEXR in pov-ray 3.7, only
made the banding worse than ever :( (when opening the exr in photoshop cs4)

Since the picture is to appear in a magazine soon I am in desperate need of a
solution!

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