Epson Expression 1680 - Manual (Page 27)

Understanding EPSON TWAIN Pro Features 2-7
Pixel Depth
Select the pixel depth from:
48-bit Color, 24-bit Color, 16-bit Gray, 8-bit Gray, and Black &
White .
Note:
❏ Depending on the model of your scanner, the 48-bit Color setting
may be 42 or 36 bits, and the 16-bit Gray setting may be 14 or 12 bits.
❏ The Pixel Depth setting determines which values are displayed in
the Densitometer window. For more information, see “Using the
Densitometer” on page 2-28.
Scanning Mode
Use this setting to select between speed and quality. Best provides
the best quality image, while Draft provides faster scanning with
some loss of quality. Note that you can also change the scanning
mode of the previewed image using the Configuration dialog box.
See “Making Configuration Settings” on page 2-17 for details.
De-screening
Select either On or Off . When On is selected, moiré patterns are
automatically removed from scanned images, but scanning takes
longer.
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.
Auto Exposure Option
Allows you to specify the kinds of adjustments made by the Auto
Exposure feature. When scanning photographs or documents that
contain high quality images, select
Photo . Select Document when
scanning printed text.