Epson Expression 1680 Setup Manual page 114

Previewing images
To preview an image, click the Preview button in the EPSON
TWAIN Pro main dialog. The Preview window appears.
Use the Preview tools to change the size of the previewed image.
Use the Marquees tools to select one or a number of areas of the
image. Use the Adjust tools to adjust the image quality. For details
on using the Preview window to optimize scanning, see the online
Reference Guide, or EPSON TWAIN Pro's online help.
Note:
Although the image in the Preview window changes as you make
settings, the settings do not affect the actual image until you scan or
rescan the image.
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Using Your Scanner