Canon Pixma MG3550 Online Manual page 94

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
Auto
ON
ON
ON
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