FFT

I just figured out a cool trick in Photoshop. Often my X-ray images from the synchtrotron at NSLS have periodic noise in them, which shows up as fringes. These are annoying and can make the images look bad. After some web searching, I came across this page which uses a fast Fourier transform to remove periodic fringes. It seems to work well. The top image is the original, and the bottom is after filtering three distinct sets of fringes. As you can see, the features of interest are largely untouched and actually appear sharper in the filtered image.