Epson Expression 1680 Reference Manual page 118

Place a transparent sheet between the document and
document table to defocus the image.
Move or angle the document slightly on the document table.
Select Off from the Unsharp Mask list in the Destination dialog
box.
Make the image size slightly smaller.
Change the focus setting.
Colors differ from the original.
Make sure the Image Type and Destination settings are
correct. To change these settings, see "Selecting an Image
Type" on page 2-4 and "Selecting a Destination" on page 2-9.
When using the Transparency Unit, make sure the opening
near the hinges on the document table is uncovered, and that
the Transparency Unit is closed when scanning.
Monitor colors
Check the color matching and color management capabilities
of your computer, display adapter, and software. Some
computers can change the color palette to adjust the colors on
your screen. See your software and hardware manuals for
details.
Exact color matching is very difficult. Check your software
and monitor documentation for information on color
matching and calibration.
Maintenance and Troubleshooting
5-17