I have quite a few PDN images I took with my Polaroid PDC3000 digital camera in the late 90's. The accompanying software is hopelessly obsolete, and I am unable to open these files. Several years ago when trying to find a solution, I changed the the suffix/file type from PDN to TIF, and I get a result exactly like your online tool. The image is there, but it is very tiny, and when enlarged, is disarmingly pixelated. Any suggestions on how I might open these files will be greatly appreciated. I am currently using MacOS; on a Mac Studio Ultra.