Canon CanoScan D1230UF User Manual page 38

chapter 4
What is on the
Screen?
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Click this check box if you want ScanGear CS-U to conduct moiré
reduction to improve the overall image quality. Moiré are dot patterns
that interfere with processing images for professional use and are usually
caused by poor dithering resulting from scanning images from
newspapers, books, magazines, etc.
This function is the same as the Descreen function in the Advanced
mode.
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