Epson GT-12000 User Manual page 82

The edges of the document are missing from the scanned output.
The document table has non-readable areas around the edges.
If part of your document extends beyond the maximum limits
marked on the document table edge guides, you may have to
reposition your document so that the image you want to scan
is within the readable area.
Color is patchy or distorted at the edges of the image.
If the document is very thick or warped at the edges, the
edges of the image may be discolored. Cover the edges of the
document with opaque paper to block outside light.
If part of the document extends beyond the document table,
that edge may not be in contact with the document table.
Change the position of the document.
The image is faint or out of focus.
Check that the document is placed flush against the document
table.
Make the brightness setting in your software darker.
The image is too dark.
Adjust the brightness with your software. Also check the
brightness and contrast values of your display screen.
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Troubleshooting and Maintenance