Canon CanoScan D660U User Manual page 61

Problem: Smudges are appearing on glossy color photo scans
Solution: Photos are adhering to the document glass are causing the light to
refract, creating the striped patterns. Shift the photo to a different
position on the document glass or clean the document glass before
rescanning.
Problem: Coloring of the preview image and the printed image is
different
Solution 1: Insufficient printer toner (ink). Replenish or replace the toner. (printer
manual)
Solution 2: Color balance or gamma value setting in the printer driver doesn't
match the printer. Manually adjust the settings in the printer driver.
(printer manual)
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