Canon PIXMA MG4200 Series On-Screen Manual page 627

Adjusting the image brightness and color tone
Set Image Adjustment to Auto, Photo, Magazine, or Document according to the document type.
None
Reducing show-through in text documents or lightening the base color in recycled paper,
newspapers, etc. when scanning documents
Set Reduce Show-through to ON.
OFF
Sharpening slightly out-of-focus images
Set Unsharp Mask to ON.
OFF
Reducing gradations and stripe patterns
Set Descreen to ON.
OFF
Note
Printed photos and pictures are displayed as a collection of fine dots. "Moire" is a phenomenon where
uneven gradation or a stripe pattern appears when such photos or pictures printed with fine dots are
Auto
ON
ON
ON