User's Guide Scanner GT-2500
Table Of Contents
- Copyright and Trademarks
- Contents
- Safety Instructions
- Overview of Your Scanner Features
- Guide to the Scanner Parts
- Placing Originals on the Scanner
- Scanning Using the Automatic Document Feeder
- Scanning Using the Document Table
- Using the Scanner Features
- Using the Optional Network Image Express Card
- Maintenance
- Troubleshooting
- Reading the Scanner Lights
- Scanner Problems
- Scanning Software Problems
- Scan Quality Problems
- The Edges of Your Document Are Not Scanned
- You See Only a Few Dots in Your Scanned Image
- A Line of Dots Always Appears in Your Scanned Images
- Straight Lines in Your Image Come Out Crooked
- Your Image is Distorted or Blurred
- Colors Are Patchy or Distorted at the Edges of Your Image
- Your Scanned Image is Too Dark
- An Image on the Back of Your Original Appears in Your Scanned Image
- Ripple Patterns Appear in Your Scanned Image
- Characters Are Not Recognized Well When Converted into Editable Text (OCR)
- Scanned Colors Differ from the Original Colors
- Automatic Document Feeder Problems
- Optional Network Image Express Card Problems
- Uninstalling Your Scanning Software
- Where To Get Help
- Technical Specifications
- Index
156 Troubleshooting
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.
If you are scanning with the ADF, see "Selecting Basic Settings"
on page 49 for details.
If you are scanning from the document table, see "Selecting Basic
Settings" on page 79 for details.
Ripple Patterns Appear in Your Scanned Image
A ripple pattern (called moiré) 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.
Original image with
ripple pattern
Descreening Filter applied