Image colors are patchy at the edges, Ripple patterns appear in an image, Streaks appear in all scanned images – Epson WorkForce Pro WF-7820 All-in-One Inkjet Printer User Manual
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• Select
Settings
>
Scan Settings
and try adjusting these settings and scanning again:
• On the
Main Settings
tab, make sure you select the correct
Image Type
for your original.
• On the
Main Settings
tab, try increasing the
Resolution
setting.
• On the
Advanced Settings
tab, select
Text Enhancement
and choose a setting.
Note:
The
Text Enhancement
setting depends on the selected
Image Type
.
• If the
Image Type
is set to
Black & White
, adjust the
Threshold
setting on the
Advanced Settings
tab. (The
Image Option
must be set to
None
.)
Parent topic:
Solving Scanned Image Quality Problems
Image Colors are Patchy at the Edges
If you are scanning a thick or warped original, cover its edges with paper to block external light as you
scan it.
Parent topic:
Solving Scanned Image Quality Problems
Ripple Patterns Appear in an Image
You may see a ripple pattern (called a moiré) in scanned images of printed documents. This is caused
by interference from differing pitches in the scanner's screen and your original's halftone screen. To
reduce this effect, adjust these Epson Scan 2 settings (if available) and try scanning again:
• Select the
Descreening
setting on the Advanced Settings tab.
• Select a lower
Resolution
setting.
• Place the original at a slightly different angle.
Parent topic:
Solving Scanned Image Quality Problems
Related references
Additional Scanning Settings - Main Settings Tab
Additional Scanning Settings - Advanced Settings Tab
Streaks Appear in All Scanned Images
If streaks appear in all your scanned images, try these solutions:
• Clean the scanner glass with a soft, dry, lint-free cloth or use a small amount of glass cleaner on the
cloth, if necessary. Paper towels are not recommended.