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Most text I've done was on 300dpi, and worked pretty fine.
300dpi for clean scans, higher if the pages are yellowed out, it has images, or if it uses non-standard letter types.
200dpi works, but you'll have lots more trouble with correcting OCR errors.
72dpi in 3bit (8 tint) greyscale png I'd recommend as smallest scan for reading a book. It's not good enough for OCR though...
The needed DPI also depends on the font size of the printed (original scanned) page.
Last edited by ProDigit; 12-28-2008 at 03:19 PM.
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