What does a calibration sheet look like?
Doxie comes with a plastic sheet that helps you calibrate your scanner.If you haven't used your calibration sheet for a while, make sure that it is free of smudges or extra markings before feeding it through the scanner. A dirty calibration sheet can result in lines, dots, or other quality issues on your scans.
This image shows a calibration sheet that has a smudge on it. This image shows a scan from a Doxie calibrated with a dirty sheet.