Canon 2921B002 On-Screen Manual page 365

Setting Items
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 Descreen ON if you notice any uneven
shades or a striped pattern on the scanned image.
Note
Even if Descreen is set to ON, some moire effects may remain if Unsharp Mask is set to
ON. In that case, set Unsharp Mask to OFF.
4.
Hide show-through*1
Characters on the back may show through when scanning a thin document such as a
newspaper. Select Hide show through If characters seem to show through on the scanned
document.
*1 Not available when scanning a photo.
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