Hello, When I want to use an adaptive filter to reduce speckle from my SAR imagery, should I input an amplitude or power image? What I did do was input an amplitude image and ran an enhanced lee filter. My result was an image with a "sprinkling" of Nan's. Is anyone familiar with this? I do believe, theoretically, I implemented the correct cutoff values on the filter (and I held the damping factor to 1). RS