Canon MX870 Series User Manual page 376

When you execute print, the printer corrects the photo coloring and prints out the photos.
Important
Photo Optimizer PRO does not function when:
Background is set in the Stamp/Background dialog box on the Page Setup tab.
Define Stamp... is selected in the Stamp/Background dialog box on the Page Setup tab, and the
bitmapped stamp is configured.
Note
Depending on images, the Photo Optimizer PRO may have no discernible effect.
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