Canon MX870 Series User Manual page 717

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 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.
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.
You can set this setting when Recommended is selected on the Color Settings tab of the
Preferences dialog box.
Fading Correction may not be effective if the scan area is too small.
Grain Correction
Use this function to reduce graininess (roughness) in photos taken with high-speed or sensitized film.
None
Graininess will not be reduced.
Low
Select this when the photo is slightly grainy.
Medium
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 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.