Canon 2921B002 On-Screen Manual page 526

Correcting Images (Unsharp Mask, Reduce Dust and Scratches, Fading Co...
Sharpening slightly out-of-focus images
Set Unsharp Mask to ON.
OFF
Reducing gradations and stripe patterns
Set Descreen to ON.
OFF
Note
Moire is an uneven gradation or stripe pattern that appears in parts of a scanned image where the
dots have interfered with each other. Descreen is the function for reducing this moire effect.
Reducing dust and scratches
Set Reduce Dust and Scratches to Low, Medium or High according to the degree of dust and scratches.
None
Correcting photos that have faded with time or due to colorcast
Set Fading Correction to Low, Medium or High according to the degree of fading or colorcast.
None
ON
ON
Medium
Medium
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