Image Types; Image Type List - Epson PERFECTION 1640 SU Reference Manual

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
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Understanding EPSON TWAIN Features