Fourier Transform in Photoshop

Usually referred to as “Fourier Filters”, Fast Fourier Transforms or FFT is a plugin used in Photoshop to remove paper texture when editing a scanned photo. It helps lessen the texture of repeating patterns in a photo without losing the details unlike other tools used in Photoshop.

You basically split an image into frequency components. The filter can remove the “peaks” based on the frequencies that make up repeating patterns. Then an inverse FFt is done to transform the image back.