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Depends on what size the photo is. You can probably double the size of the scanned photo for an OK print at 300 dpi. That would make the effective dpi of the enlargement 150 dpi, and to me that's a bare minimum. If you want to be able to do an 8 x 10 or 11 x 16 from a 4 x 6 photo, go up to 600 dpi on the scan. Just my opinion. Some others may disagree. You should experiment using your own equipment and whatever print method you use and do one enlargement--not a tremendous investment if it's not a good result.
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