As you may know, I use FFT (polar) in two of my G’MIC commands. However, they are unrefined given how little I know about FFT. Questions to start the conversation:
1 How does one interpret FFT or FFT polar pairs in relation to the input image? What are the axes and how are the guidelines drawn?
2 How would one apply low, high or band passes in this space? What shape(s) should masks be? How would denoising work (i.e., on images degraded by Gaussian and other types of noise)?