Epson Expression 1680 - Manual (Page 47)

Understanding EPSON TWAIN Pro Features 2-27
To open the Preview window and the Densitometer, click Preview
in the EPSON TWAIN Pro main dialog box.
The Preview window displays the effects of the following
settings.
❏ Image Type: Pixel Depth, Dropout, and Halftone
❏ Destination: Unsharp Mask
❏ Image Controls
❏ Tone Correction
❏ Color Adjustment