Epson Aculaser CX21N Series, User Manual

Page: 314 / 401

Scanning Problems 314
An Image on the Back of Your Original Appears in Your Scanned
Image
If your original is printed on thin paper, images on the back may be visible to the scanner
and appear in your scanned image. Try scanning the original with a piece of black paper
placed on the back of it. Also make sure the Document Type and Image Type settings are
correct for your original. See "Selecting Basic Settings" on page 142 for details.
Ripple Patterns Appear in Your Scanned Image
A ripple pattern (called moiré) is a pattern that may appear in a scanned image of a printed
document. It is caused by interference from the differing pitches in the scanner’s screen
and the halftone screen in your original.
❏
Select the Descreening Filter check box in Epson Scan’s Home or Professional Mode
window. In Professional Mode, set the Screen Ruling of the Descreening Filter setting
to an appropriate setting for your document and deselect the Unsharp Mask Filter
setting. See "Adjusting the Color and Other Image Settings" on page 153 for
instructions.
❏
Select a lower Resolution setting. See "Selecting the Scan Resolution" on page 147
for instructions.
Note:
You cannot remove ripple patterns when you are scanning using a resolution higher than 601
dpi.
Characters Are Not Recognized Well When Converted Into Editable
Text (OCR)
❏
Make sure the document lies perfectly straight on the document table. Align the vertical
and horizontal lines with the scales at the top and side of the document table.
Original image with
moiré pattern Descreening Filter
applied