I think this question is on topic. Sure it has overlap with several other stackexhange sites. That in itself is not, and should not be considered a problem.
If that question is off topic then that means most filtering and many texture generation questions are also possibly out of topic. So in a wider scope, computer graphics is often signal processing. Example of a question that is in this category:
Per this discussion I went ahead and cross-posted this in the other two suggested SE forums to acquire their viewpoints and expertise on this matter. So far (it is still a little "early in the day" so to speak) I have received some pretty interesting information in 2 of the 3.
When this is all done (when good answers have been selected) I would appreciate a way to merge these for the benefit of all three SE communities: