Epson 1640SU - Perfection Photo Scanner, Reference Manual

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3-8
Understanding EPSON TWAIN Features
Image Types
Use the Image Type list or button to select the type of image to be
scanned.
Image Type list
The Image Type list provides the following predefined settings.
EPSON recommends you use the predefined settings first, then
later improve the quality of the scanned image manually by
making the detailed settings described in the following pages, if
necessary. Click the arrows on the right to view all of the available
settings.
Color Photo (42-bit):
42-bit color, best quality
This setting is useful when scanning positive or negative film for
further editing.
Color Photo:
24-bit color, best quality
This setting is useful when scanning color photo.
Color Document:
24-bit color and best quality with de-screening to remove moiré
patterns