Fourier Image Filtering
This is very cool and impressive, really good job!Image filtering is a popular subject these days thanks partly to Instagram, and this subject is on the boundary between art and science, which is nice for a change of pace sometimes.Anyway, to master image filtering in photoshop/GIMP for example requires learning a (very) large number of words and concepts which seemingly have no organizational structure.  These words/concepts exist for historical reasons, and not because they represent some sort of cohesive or unified approach to filtering in general.  The exact same problem exists for simulating effects pedals for guitars in programs like Pro Tools, interestingly.Only Fourier methods can possibly unify this type of filtering, for a number of reasons which are actually obvious to anyone who is familiar with the fundamental role played by these methods in analysis.The problem seems to be that the people who actually use this stuff all the time do not know Fourier methods and are not in a position to learn it; and this has created a massive inertia against re-formulating the entire UI/UX for image filtering based on the only possible unified approach.It might be thought that Fourier methods are too hard for a graphic designer to understand, but I believe that it is up to people like us who do understand these things to redo the entire approach to filtering from square one, based on Fourier methods. In fact, I believe such an approach will make this subject much more accessible to everyone, and will be significantly easier for power users as well.