Here's a tool that let's you try the transform interactively: http://www.ejectamenta.com/Imaging-Experiments/fourierimagefiltering.html http://www.ejectamenta.c

Here's a tool that let's you try the transform interactively: http://www.ejectamenta.com/Imaging-Experiments/fourierimagefiltering.html http://www.ejectamenta.com/Imaging-Experiments/fourierimagef...