Canon PIXMA iP90 Quick Start Manual page 38

Advanced Printing
To reduce noise from images captured with a digital camera:
Photo Noise Reduction function reduces noise from blue portions such as those
found in the skies and dark portions of images captured with a digital camera.
Note
To use Photo Noise Reduction, select the Photo Noise Reduction check box on the
Effects tab.
To use Photo Noise Reduction, select the Photo Noise Reduction check box under
Special Effects.
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In Windows Me or Windows 98
If Background Printing has been disabled, the Photo Noise Reduction
function is not available.