Epson STYLUS SCAN 2500 User Manual page 145

Note:
A moire is a crosshatch 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.
Dropout:
Select a color to subtract from a black and white scan of a
colored original. Proper use of dropout can improve the
quality of your black and white scans. Available dropout
options are:
None , Red, Green, and Blue.
Note:
Dropout is available only when Pixel Depth is set to 8-bit Gray
or Black & White.
Depending on the image you scan, you may need to adjust the
Threshold setting in the Image Controls dialog box to enable
this feature.
B/W Options:
Select from:
Text Enhancement Technology, Auto Area Segmentation,
or None.
Text Enhancement Technology
To improve recognition accuracy during OCR (Optical
Character Recognition) scanning, select this option. This
function eliminates the document background from scans.
Auto Area Segmentation
To make grayscale images clearer and text recognition more
accurate, select this option. This function separates text from
graphics.
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