Avision AV8000S - Manual (Page 34)

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5.10 DESCREEN
Click on the Descreen button to access a drop-down
menu that allows you to specify the type of document you a re
scanning in order to eliminate the moiré pattern* commonly
found in printed matter. You can specify Newspaper,
Magazine, or Catalog.
Before Descreen After Descreen
*Moiré pattern— an undesirable pattern resulting from the
incorrect screen angle of the overprinting halftone.
5.11 SHARPEN
Click on the Sharpen button to access a drop-down
menu that allows you to specify a level to sharpen the
scanned image. You can specify a Sharpen setting of Light,
More, Heavy, or Extra Heavy.