Canon MG8100 series On-Screen Manual page 551

5.
Reduce show-thru*1*2 (Reducing show-through)
Characters on the back may show through when scanning a thin document such as a newspaper.
Select ON if characters seem to show through on the scanned document.
6.
Descreen*1*2
A printout consists of minute dots to make characters or graphs. Interfering with each dot may result
in uneven shades or a striped pattern. Select ON if you notice any uneven shades or a striped
pattern on the scanned image.
Note
Even if ON is selected for this setting, some moire effects may remain if Unsharp mask is set
to ON. In that case, select OFF for Unsharp mask.
7.
Unsharp mask
The outline of small characters or thin objects can be accentuated. Select ON if you want to
accentuate the outline of the scanned data.
*1 Not available when scanning a film.
*2 Not available when scanning a photo.
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