Epson Gt20000 User Guide

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Scanning Problems
You Cannot Scan Using the Thumbnail Preview
❏If you are using Office Mode, the thumbnail preview is not available. Change the scan 
mode to Home Mode or Professional Mode. See “Changing the Scan Mode” on page 
22 for instructions.
❏If you are scanning images with a very dark or bright background, use normal preview 
and create marquees on the areas you want to scan. See “Previewing and Adjusting 
the Scan Area” on page 34 for instructions.
❏If the optional ADF is installed, the thumbnail preview is not available. Use normal 
preview and create marquees on the areas you want to scan. See “Previewing and 
Adjusting the Scan Area” on page 34 for instructions.
❏If you are scanning a large size document, use normal preview and create marquees 
on the areas you want to scan. See “Previewing and Adjusting the Scan Area” on page 
34 for instructions.
❏Make sure the Document Type setting is correct. See “Scanning in Home Mode” on 
page 25 or “Scanning in Professional Mode” on page 27 for instructions.
❏Click Configuration, select the Preview tab, and adjust the thumbnail cropping area 
using the Thumbnail Cropping Area slider in the Preview menu. See Epson Scan 
Help for details.
You Have Trouble Adjusting the Scan Area in the Thumbnail Preview
❏Create a marquee or adjust the existing marquee to select the area you want to scan. 
See “Previewing and Adjusting the Scan Area” on page 34 for instructions.
❏Click Configuration, select the Preview tab, and adjust the thumbnail cropping area 
using the Thumbnail Cropping Area slider in the Preview menu. See Epson Scan 
Help for details.
❏Use the normal preview and create marquees on the areas you want to scan. See 
“Previewing and Adjusting the Scan Area” on page 34 for instructions.
You Cannot Scan Multiple Images at One Time
❏Position photos at least 20 mm (0.8 inch) apart from each other on the document table. 
						

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❏If the optional ADF is installed, you need to create a marquee for each photo on the 
document table. Create a marquee for each photo, click All in the Preview window, then 
click Scan. See “Previewing and Adjusting the Scan Area” on page 34 for instructions.
Scanning Takes a Long Time
❏Try scanning your original at a lower resolution setting to speed up scanning. See 
“Selecting the Scan Resolution” on page 32 for instructions. 
❏Computers with USB 2.0 (high speed) ports can transfer data faster than those with 
USB 1.1 ports. Therefore, the scanning time may be shorter if you use a computer with 
a USB 2.0 port. If you are using a USB 2.0 port with your scanner, make sure it meets 
the system requirements. See “System Requirements” on page 142 for details.
Scan Quality Problems
The Edges of Your Original Are Not Scanned
Move the document or photo about 3 mm (0.12 inch) away from the horizontal and vertical 
edges of the document table to avoid cropping.
You See Only a Few Dots in Your Scanned Image
❏Make sure the document or photo is placed on the document table with the side to be 
scanned facing down. See “Placing Documents or Photos” on page 16 for details.
❏When scanning with the Black & White setting, change the Threshold setting. See 
“Adjusting the Color and Other Image Settings” on page 39 for instructions. 
						

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A Line or Line of Dots Always Appears in Your Scanned Images
The document table may need cleaning. Clean the document table. See “Cleaning the 
Scanner” on page 112. 
If you still have the problem, the document table may be scratched. Contact your dealer for 
assistance. See “Contacting Customer Support” on page 133.
Straight Lines in Your Image Come Out Crooked
Make sure the document lies perfectly straight on the document table.
Your Image Is Distorted or Blurred
❏Make sure the document or photo lies flat on the document table. Also make sure your 
document or photo is not wrinkled or warped.
❏Make sure you do not move the document or photo, or your scanner while scanning.
❏Make sure the scanner is placed on a flat, stable surface.
❏Select Unsharp Mask check box in Office Mode or Professional Mode window. See 
“Adjusting the Color and Other Image Settings” on page 39 for instructions.
❏Adjust the Auto Exposure setting in Professional Mode window. See “Adjusting the 
Color and Other Image Settings” on page 39 for instructions. 
❏Click Configuration, select the Color tab, and select Color Control and Continuous 
auto exposure in the Color menu. See Epson Scan Help for details.
❏Click Configuration, select the Color tab, and click Recommended Value to return 
the Auto Exposure setting to the default. See Epson Scan Help for details.
❏Increase the resolution setting. See “Selecting the Scan Resolution” on page 32 for 
instructions. 
						

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Colors Are Patchy or Distorted at the Edges of Your Image
If your document is very thick or curled at the edges, cover the edges with paper to block 
external light as you scan.
Your Scanned Image Is Too Dark
❏If your original is too dark, try using the Backlight Correction feature in Home Mode or 
Professional Mode. See “Fixing Backlit Photos” on page 58 for instructions.
❏Check the Brightness setting. See Epson Scan Help for details.
❏Click Configuration, select the Color tab, and change the Display Gamma setting to 
match your output device, such as a monitor or printer, in the Color menu. See Epson 
Scan Help for details.
❏Click Configuration, select the Color tab, and select Color Control and Continuous 
auto exposure in the Color menu. See Epson Scan Help for details.
❏Click Configuration, select the Color tab, and click Recommended Value to return 
the Auto Exposure setting to the default. See Epson Scan Help for details.
❏Click the  Histogram Adjustment icon in Professional Mode to adjust the brightness.
❏Check the brightness and contrast settings of your computer monitor. 
						

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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 “Scanning in Office Mode” on page 23, “Scanning in Home 
Mode” on page 25, or “Scanning in Professional Mode” on page 27 for instructions. 
Ripple Patterns Appear in Your Scanned Image
A ripple or cross-hatch 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.
❏Select the Descreening check box. In Professional Mode, select an appropriate 
Screen Ruling for the Descreening and deselect the Unsharp Mask setting. See 
“Adjusting the Color and Other Image Settings” on page 39 for instructions.
❏Select a lower resolution setting. See “Selecting the Scan Resolution” on page 32 for 
instructions.
Note:
You cannot remove ripple patterns when you are scanning using a resolution higher than 600 dpi.
Characters Are Not Recognized Well
❏Make sure the document lies perfectly straight on the document table.
❏In Office Mode or Home Mode, select the Text Enhancement check box.
Original image Descreening applied 
						

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❏Adjust the Threshold setting.
Office Mode: Select Black&White as the Image Type setting and select the 
appropriate Image Option setting. Then try adjusting the Threshold setting. See Epson 
Scan Help for details.
Home Mode: Select Black&White as the Image Type setting. Then try adjusting the 
Threshold setting. See Epson Scan Help for details.
Professional Mode: Select Black & White as the Image Type setting. Click the 
+(Windows) or r(Mac OS X) button next to Image Type and select the appropriate 
Image Option setting. Then try adjusting the Threshold setting. See Epson Scan Help 
for details.
❏Check your OCR software manual to see if there are any settings you can adjust in your 
OCR software.
Scanned Colors Differ From the Original Colors
❏Make sure the Image Type setting is correct. See “Scanning in Office Mode” on page 
23, “Scanning in Home Mode” on page 25, or “Scanning in Professional Mode” on page 
27 for instructions. 
❏Click Configuration, select the Color tab, and change the Display Gamma setting to 
match your output device, such as a monitor or printer, in the Color menu. See Epson 
Scan Help for details.
❏Adjust the Auto Exposure setting in Professional Mode. Also try selecting a different 
Tone Correction setting. See “Adjusting the Color and Other Image Settings” on page 
39 for instructions.
❏Click Configuration, select the Color tab, and select Color Control and Continuous 
auto exposure in the Color menu. See Epson Scan Help for details.
❏Click Configuration, select the Color tab, and click Recommended Value to return 
the Auto Exposure setting to the default. See Epson Scan Help for details.
❏Click Configuration, select the Preview tab, and turn off the Fast Preview setting in 
the Preview menu. See Epson Scan Help for details.
❏Make sure to enable the Embed ICC Profile setting. In the File Save Settings window, 
select JPEG or TIFF as the Type setting. Click Options, then select the Embed ICC 
Profile check box. To access the File Save Settings window, see “Selecting File Save 
Settings” on page 29. 
						

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❏Check the color matching and color management capabilities of your computer, display 
adapter, and software. Some computers can change the palette of colors on your 
screen. See your software and hardware manuals for details.
❏Windows: Use the color management system for your computer, ICM. Add a color 
profile that matches your monitor to improve on-screen color matching. Exact color 
matching is very difficult. Check your software and monitor documentation for 
information on color matching and calibration. 
❏Mac OS X: Use the color management system for your computer, ColorSync. Exact 
color matching is very difficult. Check your software and monitor documentation for 
information on color matching and calibration. 
❏Printed colors can never exactly match the colors on your monitor because printers and 
monitors use different color systems: monitors use RGB (red, green, and blue) and 
printers typically use CMYK (cyan, magenta, yellow, and black).
Images are Rotated Incorrectly
❏Make sure the documents or photos are placed on the document table correctly. See 
“Placing Documents or Photos” on page 16 for instructions.
❏If you are scanning using thumbnail previews, select the image and click the 
rotation icon to rotate it. See “Previewing and Adjusting the Scan Area” on page 34 
for instructions.
❏Try disabling or enabling the Auto Photo Orientation setting. Click Configuration, 
select the Preview tab, and select or deselect Auto Photo Orientation. 
Note:
❏The Auto Photo Orientation feature will not work when you scan newspaper or magazine 
pages, documents, illustrations, or line art. The feature will also not work when you scan 
images that are 5.1 cm (2 inches) or smaller on any side.
❏The Auto Photo Orientation feature may not work correctly if the faces in your image are 
very small or not looking straight ahead, or if the faces are of infants. The feature may also 
not work correctly if you scan an indoor image that contains no faces, an outdoor image in 
which the sky is not at the top, or any image containing bright spots or objects in locations 
other than the top of your image.
Uninstalling Your Scanning Software
You may need to uninstall and then reinstall your scanner software to solve certain 
problems or if you upgrade your operating system.  
						

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Uninstalling Epson Scan
Follow the instructions in the section for your operating system to uninstall Epson Scan.
Uninstalling Epson Scan for Windows
Note:
❏For Windows Vista, you need an administrator account and password if you log on as a 
standard user.
❏For Windows XP, you must log on to a Computer Administrator account.
❏For Windows 2000, you must log on as a user with administrative privileges (belonging to the 
Administrator group).
1. Turn off the scanner.
2. Disconnect the scanner’s interface cable from your computer.
3. Do one of the following.
Windows Vista: Click the start button icon and select Control Panel.
Windows XP: Click Start and select Control Panel.
Windows 2000: Click Start, point to Settings, and select Control Panel.
4. Do one of the following.
Windows Vista: Click Uninstall a program from in the Programs category.
Windows XP: Double-click the Add or Remove Programs icon.
Windows 2000: Double-click the Add/Remove Programs icon.
5. Select EPSON Scan from the list.
6. Do one of the following.
Windows Vista: Click Uninstall/Change, then click Continue in the User Account 
Control window.
Windows XP or 2000: Click Change/Remove.
7. When the confirmation window appears, click Yes.
8. Follow the on-screen instructions to uninstall Epson Scan. 
						

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In some cases, a message may appear to prompt you to restart the computer. If so, 
make sure I want to restart my computer now is selected and click Finish.
Uninstalling Epson Scan for Mac OS X
Note:
You must log on to a Computer Administrator account.
1. Quit all running applications.
2. Insert the scanner software CD-ROM into your Macintosh.
3. Double-click the Mac OS X icon in the Epson folder. You see the CD Installer screen. 
4. Click Custom Install.
5. Select Scanner Driver (EPSON Scan).
Note:
If the Authenticate window appears, enter your password or phrase and click OK.
6. Read the software license agreement and click Accept.
7. Select Uninstall from the menu in the upper left and click Uninstall.
8. Follow the on-screen instructions to uninstall the scanner driver.
Uninstalling the User’s Guide
If you need to uninstall this on-screen User’s Guide, follow the steps here for your 
operating system.
Uninstalling the Online User’s Guide for Windows
Note:
❏For Windows Vista, you need an administrator account and password if you log on as a 
standard user.
❏For Windows XP, you must log on to a Computer Administrator account.
❏For Windows 2000, you must log on as a user with administrative privileges (belonging to the 
Administrator group).
1. Turn off the scanner.
2. Disconnect the scanner’s interface cable from your computer. 
						

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3. Do one of the following.
Windows Vista: Click the start button icon and select Control Panel.
Windows XP: Click Start and select Control Panel.
Windows 2000: Click Start, point to Settings, and select Control Panel.
4. Do one of the following.
Windows Vista: Click Uninstall a program from the Programs category.
Windows XP: Double-click the Add or Remove Programs icon.
Windows 2000: Double-click the Add/Remove Programs icon. 
5. Select your scanner’s Manual from the list.
6. Do one of the following.
Windows Vista: Click Uninstall/Change, then click Continue in the User Account 
Control window.
Windows XP or 2000: Click Change/Remove.
7. When the confirmation window appears, click Yes.
8. Follow the on-screen instructions to uninstall the User’s Guide.
Uninstalling the Online User’s Guide for Mac OS X
Note:
You must log on to a Computer Administrator account.
1. Quit all running applications.
2. Insert the Epson scanner software CD-ROM into your Macintosh.
3. Double-click the Mac OS X icon in the Epson folder. You see the CD Installer screen.
4. Click Custom Install.
5. Select User’s Guide, then click Uninstall.
6. Follow the on-screen instructions to uninstall the User’s Guide.