Epson WorkForce Pro WF-4830 Users Guide - Page 336
Image Colors are Patchy at the Edges, Ripple Patterns Appear in an Image, Streaks Appear in All
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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 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. 336