Q:
How should I choose among the available resolution settings?
A:
Use the following guidelines about scan resolution:
1 - Low res scans are for quickly preserving a bit of information, like a note you might jot down. They are human readable but not machine readable, and they can be emailed quickly.
2 - Medium res scans are for small documents (like business cards). They have enough resolution to do very good quality OCR (optical character recognition).
3 - High or Ultra res scans are for full page documents that will be used for OCR or reprinting.