Canon MP980 series On-Screen Manual page 631

Image Settings
It is recommended that you normally select this setting.
High
Select this when the photo is very grainy. This can affect the gradation and sharpness of the
image.
Important
Grain Correction may not be effective if the scan area is too small.
Backlight Correction
Use this function to correct photos and film that have been shot against light.
When you change the Backlight Correction setting, the result will be reflected in the preview image.
None
Backlight correction will not be applied.
Low
Select this to correct slightly backlit photos. This will not affect the image contrast.
Medium
It is recommended that you normally select this setting.
High
Select this to correct strongly backlit photos. This can affect the image contrast.
Important
You can set Backlight Correction after preview.
You can set this setting when Recommended is selected on the Color Settings tab of the
Preferences dialog box.
Backlight Correction may not be effective if the scan area is too small.
When you click Multi-Crop, you cannot change this setting.
Note
Noise patterns may appear when Backlight Correction is applied. Applying Grain Correction and
setting Unsharp Mask to OFF may reduce the noise patterns.
Gutter Shadow Correction
Use this function to correct shadows that appear between pages when scanning open booklets.
When you set the Gutter Shadow Correction setting in the preveiw image, the result will be reflected.
Preview the effects before scanning, as results vary depending on the type of document and how it is
pressed.
Unclear or blurred text/lines caused by curved pages are not corrected.
None
Gutter shadow will not be corrected.
Low
Select this when the effect level is too strong with the medium setting.
Medium
It is recommended that you normally select this setting.
High
Select this when the effect level is too weak with the medium setting.
Important
Do not place items that weigh 4.4 lbs (2.0 kg) or more on the Platen. Also, do not press on the
document with a force exceeding 4.4 lbs (2.0 kg). If you press heavily, the scanner may not work
correctly or you might break the glass.
When you click Multi-Crop, this setting is not available. Click Reset then change the setting.
Align the document with the edge of the Platen. If not, the shadow will not be corrected properly.
Page 631 of 947 pages