Examples

This example shows the Fourier transform plug-in can effectively remove a screen pattern from an image while retaining the information. The plug-in will remove all color from the image, but you can give the gray result its color back by:

1. putting it in a layer on top of the colored original;
2. setting the blend mode of the gray top layer to "Luminance";
3. applying a Median filter or Gaussian blur to the colored original layer.

Example courtesy of Robert Silverwood

This is an inked fingerprint on a printed document. Filtering in the Fourier domain was used to remove the diagonal pattern as well as the screen (see "How to"). Click on the image to see the result.