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Originally Posted by torifile
I think that you should scan at as high a resolution as your scanner can handle. If you're archiving, you want to be getting the best possible image so that down the road you can do as much as possible with the image. You never know and you can't go back once the pic has deteriorated. It's just a few extra kb but you might appreciate it later.
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That's good advice in general... but scanning at full resolution is so dog-gone slow! And, I've scanned 1200 and 2400 dpi photos before - the resulting file is so exorbitantly large that no program can handle it without 8GB of RAM. I mean, if you're scanning a 4x6 at 1200 dpi, you're looking at 4800x7200 pixels... that's absolutely unnecessary for general archiving IMO. Of course, with slides and film, it's a different story, since you're starting with such a small image you'd want a very good resolution.