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Printers today need on average between 200 and 300 ppi (dpi) of image resolution information to print a high quality image on high quality paper. And I am going to make the assumption that most of us seldom print out a photograph larger than 8Ã10 inches.
The highest resolution available in an affordable film scanner (around $1000 US) is 4000 dpi. In this page we address the question, How much better could you do at 8000 dpi?, using the techniques developed in parts 1 and 2 of Understanding image sharpness. This is akin to asking, What are the ultimate limits of 35mm detail?