Interactive FFT filtering. When this option is selected the FFT Stuff control figure pops up. Here hit the button that says Power Spectrum and a new figure, like the example on the left, with the image’s power spectrum is displayed. Next one can draw either a circle or a polygon. The area enclosed by that line will be used to either retain the power values, case in which we are doing a Lowe-pass filtering or the converse (high-pass filtering). To access to choice of Low or High pass filtering simply right-click on the plotted line and select the desired option from the menu the meanwhile was shown. In case of polygonal lines, the filtering options area little bit more buried inside the “ROI Crop tools” sub-menu.
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