I love image FFT! Quite some time ago I implemented it (just a wrapped FFTW) as a plugin for the 'Shake' compositing software that we were using at the time at

I love image FFT! Quite some time ago I implemented it (just a wrapped FFTW) as a plugin for the 'Shake' compositing software that we were using at the time at RSP. It was tricky but incredible fun and like a mini-superpower! People were hand-painting full-colour bokeh images for very fancy defocus effects, among other things. Then Apple bought Shake, and we swapped to Nuke, which also has an FFT built-in which is cool, although last time I looked it didn't do the complex-to-magnitude/phase transformation-and-back which is very handy when working with FTs of pixels.