Canon DR-2580C - Manual (Page 95)

Appendices 91
Chapter 3
Scanning Results Are Not as Expected
If there is a problem with the scanning result (e.g., the scanned image is not
clear, or the image is striped or dirty), the probable causes are incorrect ISIS/
TWAIN driver settings or a problem with the scanning unit inside the scanner.
Scanning results can also become skewed if the ISIS/TWAIN driver has not
been installed correctly, or the application in use does not support ISIS/
TWAIN driver functions.
Symptoms The scanned image is too dark (or faint).
Problem The [Brightness] setting is not set to an appropriate value.
Solution If the image is dark, set a higher [Brightness] setting, or if the
image is faint, set a lower [Brightness] setting.
(See “Software Settings,” on p. 61.)
Symptoms Text or images on the rear side of your document
appear in the scanned image.
Problem The [Brightness] setting is too low, or the paper is too thin.
Solution Set a higher [Brightness] setting. If the paper is too thin, make a
copy of the documents and then scan the copy.
Symptoms Double-sided scanning is not possible.
Problem [Scanning Side] is set to [Simplex].
Solution Set [Scanning Side] to [Double-sided].
Symptoms A black margin appears around the scanned document.
Problem A document smaller than the preset paper size has been
scanned. Or, the loaded document has shifted out of
position.
Solution Set [Paper size] to [Auto-detection]. Or, set [Border Removal] to
on.
Symptoms The scanned image is skewed.
Problem The document has been fed at an angle. (skew)
Solution Use the document guide adapter to prevent document skew, and
set [Deskew] to on. (See “Software Settings,” on p. 61.)