Epson Perfection 640U Series, Справочное руководство

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Scanning Basics
Note:
A moiré is a cross-hatch pattern that appears on scanned images when
scanning printed material. It is a result of interference that occurs due
to the difference between the pitches of the scanning and the halftone
screens.
Image Location setting
Illustration: 24-bit color scanning with color
smoothing to reduce the colors in an
image to limited number of index colors
Text/Line Art: Black and white scanning
Color Document: 24-bit color scanning with de-screening to
remove moiré patterns
Black & White
Document: 8-bit gray scanning with de-screening
Auto Locate: The scanner automatically locates and
selects the target image. The image
appears without white borders. If the
document type is photo, Auto Locate
applies to each photo; otherwise it covers
the whole area of the image.
Detect Skew Angle: The scanner automatically detects the
skew of the target image. If the document
type is photo, Detect Skew Angle applies
to each photo. If the document type is
Text/Line Art, it covers the whole area of
the image.