Why can't I get my calibration coverage above 80%?
Watch our tutorial video at http://www.youtube.com/watch?v=UL1PNmT18Ns.
Make sure that you are moving the calibration board instead of taking several calibration shots at the same location. It's OK to tilt or move the scanner any time during the calibration process. (It's also fine to move it around AFTER calibration.)
We recommend taking between 40 and 60 shots: anything less than that generally does not give a good calibration.