reviewed how fft works because of this, and made this demo for image fft (picture cropped from original passage): https://gist.github.com/mikelty/4553938523f0d1

reviewed how fft works because of this, and made this demo for image fft (picture cropped from original passage): https://gist.github.com/mikelty/4553938523f0d1b0f4ee575a6241e76c https://gist.github.com/mikelty/4553938523f0d1b0f4ee575a6241... turns out skimage can do this, not just the 'special piece of software' mentioned in the article.