Epson FastFoto FF-640 Users Guide - Page 146
Ripple Patterns Appear in an Image, Spots or Lines Appear in All Scanned Images, Image Type
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• If the Image Type is set to Black & White, adjust the Threshold setting. • Select the correct Text Language setting. • Set the Image Type to Grayscale. • Set the scanning resolution between 200 and 600 dpi. • If the original document is in landscape mode, set the Rotate setting to Auto in Epson Scan 2. • If you are using OCR software, check the manual for any additional adjustments. 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. • Select a lower Resolution setting. Parent topic: Solving Scanned Image Quality Problems Spots or Lines Appear in All Scanned Images If spots or lines appear in all your scanned images, follow these steps to clean the scanner glass: 1. Turn off the scanner and unplug the AC adapter. 2. Disconnect any connected cables. 146