Canon CanoScan FB 630U User Guide - Page 47
Descreen, Procedure
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Descreen STEP 3 Moiré patterns occasionally appear when items printed at low resolutions are scanned. Moiré patterns are dot-like 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. To reduce this phenomenon, scan photographs and other low-resolution prints with the descreen activated. Shut it off to scan higher resolution items. The default setting is "off". Caution • The Descreen cannot be switched on for scanning resolutions higher than 601 dpi. • The previous setting is enabled for the Descreen when Plug-in Module CS-U is opened by a software application operating in the windowless mode. Procedure Open the [Image] menu and select [Descreen]. 47