Canon 2925B002 On-Screen Manual page 211

Image Settings
dots may interfere with each other and cause uneven gradation and a stripe pattern in the image.
Descreen is the function for reducing this moire effect. This setting is OFF by default.
Note
Even if Descreen is set to ON, some moire effects may remain if Unsharp Mask is set to ON. In
that case, set Unsharp Mask to OFF.
Selecting Magazine(Color) in Select Source in Basic Mode has the same effect as setting
Descreen to ON in Advanced Mode.
Reduce Dust and Scratches
Scanned photos and film may contain white dots caused by dust or scratches. Use this function to
reduce such noise. This setting is None by default.
None
Dust and scratches will not be reduced.
Low
Select this to reduce small dust particles and scratches. Large ones may remain.
Medium
It is recommended that you normally select this setting.
High
Select this to reduce small/large dust particles and scratches. Evidence of the reduction process
may remain and may also remove delicate parts of the image.
Important
This function may not be effective for some types of photos.
Note
It is recommended that you select None when scanning printed materials.
Fading Correction
Use this function to correct photos and film that have faded with time or have a colorcast. Colorcast is
a phenomenon where a specific color affects the entire picture due to the weather or ambient strong
colors. This setting is None by default.
None
Fading correction will not be applied.
Low
Select this to correct a small amount of fading and colorcast.
Medium
It is recommended that you normally select this setting.
High
Select this to correct a large amount of fading and colorcast. This can affect the tone of the image.
Important
You can set Fading Correction after preview.
Fading Correction may not be effective if the scan area is too small.
You can set this setting when Recommended is selected on the Color Settings tab of the
Preferences dialog box.
When you click Multi-Crop, this setting turns to None and you cannot change it.
Grain Correction
Use this function to reduce graininess (roughness) in photos taken with high-speed or sensitized film.
This setting is None by default.
None
Graininess will not be reduced.
Low
Select this when the photo is slightly grainy.
Medium
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