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Paul SMaybe I'm wrong, and if so someone feel free to correct me, but wouldn't you have to know for certain at which resolution the original scan was made? For instance, I keep my screen resolution at 800x600 pixels, and on my screen that would be accurately (supposedly) translated at 72ppi (pixels per inch) -- in other words, a 72 sq pixel area on my monitor represents 1 sq inch when translated into the real-world. However, the closest I can get my scanner to that is a preset of 75 dots per inch. But how could someone know that for sure if I didn't tell them? (so now you know my dirty secret!) I believe there are other reasons, but since I am often brevity-challenged, this will suffice.