Reset; Focus - Epson Expression 1680 Reference Manual

Gray Balance Intensity
The Gray Balance Intensity setting removes unwanted color casts
and tints by balancing color saturation.
Click the eyedropper button beneath the slider. The mouse
pointer changes to an eyedropper. Then click the color you want
to represent as gray. The eyedropper "picks up" the color and
displays it in the box beside the eyedropper button. You can then
correct the cast level for that color from 0 to 100 by moving the
slider. The corrected color appears in the box on the right, and the
effect shows up immediately in the previewed image. Click
Cancel to restore the original image.
Note:
You can use the Auto Exposure feature to automatically adjust Gray
Balance Intensity when Document is selected as the Auto Exposure
Option in the Image Type dialog box. To change the Auto Exposure
Option setting, see "Auto Exposure Option" on page 2-7.
Saturation
Saturation is the property that defines color depth. Select a
saturation level from -100 (less color) to 100 (more color) by
moving the slider.

Reset

Click the Reset button to return any Adjust button settings you
made to their default settings. If you did not alter any settings,
this button is not available.

Focus

Click the
0.0. The current setting is indicated under the button.
Focus button to set the focus position to either 2.5 or
Understanding EPSON TWAIN Pro Features
2-43