Image Quality Problems.
Scanning originals that have folds or are crumpled
on CIS scanners is often confused as a defect in
the scanner, where it is actually a limitation of the
technology used. Due to the very short distance
from the sensor to the surface of the original,
referred to as the “Focal Length”, if the document
does not stay in contact with the glass plate then
it is very likely to be out of focus.
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