Epson Expression 800 User Manual page 72

Prescan area The area in the SilverFast Lite main window where you can preview the
item you're scanning.
Resolution The amount of detail in an image, as measured in dots per inch (dpi) or
dots per centimeter (dpcm)
RGB Refers to red, green, and blue, the basic colors used to create all other
colors on a monitor.
Saturation The strength or intensity of a color based on the degree to which it lacks
its complementary color. For example, a strongly saturated blue would
have little or no yellow (its complementary color). A red with little
saturation would have a lot of cyan (its complementary color) mixed in,
and as a result, would look muddy or dark.
Glossary Page 72