Minimum? 72dpi is the minimum. They would look fine in iMovie so long as they're at least the same size as the iMovie window (720 x 480 pixels I think), and make for rather poor prints unless you have a realy expensive pplotter (in which case, they'll look great ). For a decent print, start at 150 dpi, but 300 dpi is best for most consumer printers I think.
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