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Basically, if you don't mind long scanning times and huge file size (and have a powerful enough computer to handle / edit these big files afterwards) you could go as high as you can.
In practice 48 bit is overkill, and I'm fairly sure that 3170 isn't capable of "true" 12800 DPI (it will interpolate).
If I were you I'd scan the same image at different resolutions (say 3600, 5400, 7200..), and compare the results.
I heard that Epson software is pretty shit, but check out whether you have the option of multi-pass scanning - with my scanner this gives more of an improvement to image quality than increasing DPI regarding colour & noise..
salad
MrDrem
Looking for a little bit of advice, and I think here is likely to get the best replies :)
I've just started to scan a load of old film negatives using an Epsom Perfection 3170 Photo scanner. It theoretically lets me scan up to $silly number (12800) DPI at 48 bit colour.
Given that I don't want to scan these again, what's the ideal DPI for me to be using?
Cheers!