This is probably what you are looking for. You might even want to try the thread specific version. I don't remember how fast it is, but I cant imagine it being too bad. Quality should be pretty good too, if I understand your description correctly.
Quote:
Originally Posted by Didée
I could imagine that a rather simple chain of bicubicresize (simulating a gauss blur) with mt_lutxy limiting could do a reasonable job, and it would be pretty fast. Could you show a picture or short sample of the problem? It's mostly about how "thick" the bands are, and how "sharp" their transition gradient.
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Didée makes a good point here, the specifics are important in cases like this.