Epson Expression 1680 Reference Manual page 40

Display Gamma
You can change the gamma value for your monitor by typing a
value in the Display Gamma box, or by clicking the arrows next
to the box. You can choose between values of 1.0 to 3.0 in
increments of 0.1. The default setting is 1.8.
The Display Gamma setting also determines how clicking the
Auto Exposure button affects the Gamma setting.
Continuous Auto Exposure
Select this check box to make the Auto Exposure feature work
whenever you click the Preview button, modify the size of the
preview with the zoom feature, make a marquee, or modify the
size or change the location of a marquee. If this check box is clear,
the Auto Exposure feature will only work when you click the
Auto Exposure button in the Preview window.
Note:
This feature is only available when Color Controls is selected.
ICM (for Windows) or ColorSync (for Macintosh)
Select this setting to reproduce the colors in your image using the
available color management system for your computer: ICM for
Windows, or ColorSync for Macintosh. Selecting this setting
enables you to choose a color profile for your scanner in the Source
(Scanner) list box, and a color profile for your monitor or output
device (such as printer) in the Target list box. After the image is
scanned, it is converted according to these settings before it is sent
to the application.
Note:
The ICM and ColorSync settings are provided for experienced
users. If you are not familiar with color management systems, select
Color Controls to avoid unexpected results.
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Understanding EPSON TWAIN Pro Features