Moiré No More
reviewed how fft works because of this, and made this demo for image fft (picture cropped from original passage): <a href="https://gist.github.com/mikelty/4553938523f0d1b0f4ee575a6241e76c" rel="nofollow">https://gist.github.com/mikelty/4553938523f0d1b0f4ee575a6241...</a><p>turns out skimage can do this, not just the 'special piece of software' mentioned in the article.