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The images that were obtained at sea are indeed soft-focus due to the motion of the camera. The images that were obtained with the Nikon on land don't have this problem. However, some of them do show the tracks of aircraft, but I wouldn't try to filter those out. Thanks for the detailed information on using the filter. As a mathematician, I would have thought that this type of filter would be based on recognizing a 1-D scratch or a 0-D speck of dust embedded in a 2-D image and using the information in the pixels surrounding the scratch or speck of dust to fill it in. Thanks again for the help! I have been on four Arctic sea trips, but I might not get another chance. It meant a lot to me to be able to salvage these photos!