Canon PIXMA MP560 - Manual (Page 433)

if you want to accentuate the outline of the scanned data.
3. Descreen*
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
Some moire effects may remain if Unsharp mask ON and Descreen ON are selected at
the same time. In that case, change Unsharp mask ON to Unsharp mask OFF.
4. Show-through*
Characters on the back may show through when scanning a thin document such as a
newspaper. Select Show-through ON if characters seem to show through on the scanned
document.
* Not available when scanning a photo.
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