I actually just did try it! I'm finding that random pixels don't really get swapped. Except along comparatively uncommon borders between squares, pixels are alr

I actually just did try it! I'm finding that random pixels don't really get swapped. Except along comparatively uncommon borders between squares, pixels are already very similar to their immediate neighbors. Creating a video with 10000 swaps per frame, I found no successful swaps in 50 frames. That said, I bet there's some other criterion that would have the desired effect.