Canon Pixma MP495 Series On-Screen Manual page 517

Correcting Images (Unsharp Mask, Reduce Dust and Scratches, Fading Correc...
Reducing graininess
Set Grain Correction to Low, Medium or High according to the degree of graininess.
None
Correcting backlit images
Set Backlight Correction to Low, Medium or High according to the degree of backlight.
None
Correcting shadows that appear between pages when scanning open booklets
Set Gutter Shadow Correction to Low, Medium or High according to the degree of shadows.
None
Medium
Medium
Medium
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