Canon DR-S130 User Manual page 79

When you want to reduce the color unevenness
Check the check box of [Color unevenness reduction] on the [Image
control] tab to reduce the color unevenness.
You can control the level of color unevenness by enabling the [Setting]
button.
Click [Image processing], and then set [Color Unevenness reduction]
to [ON] in the dialog box that appears. You can adjust the level of color
Unevenness.
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