Epson Expression 1680 User Manual Page 20
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- Table of contents
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1-12 Optimizing Scanning
4. Use the Threshold slider to change the threshold value,
monitoring the results of your changes in the Preview
window. Depending on the lightness, darkness, and
complexity of the background on which the text is printed,
increasing or decreasing the threshold value can make it
easier for OCR software to recognize characters.
If you still have problems...
1. In the EPSON TWAIN Pro main dialog box, try increasing the
Resolution value to 400. Be aware that scanning at higher
resolution takes longer and may not greatly increase the
recognition rate.
2. If you still have problems, try using the enhancement tools in
your OCR software to make adjustments.
Potential text recognition problems
The quality of the text in your original document greatly effects
OCR results.
The following types of originals can make recognition difficult
and should be avoided if possible:
❏ Items that have been copied from other copies
❏ Faxes
❏ Text with tightly-spaced characters or line pitch
❏ Text that is in tables or underlined
❏ Cursive or italic fonts, and font sizes less than 8 points
Remember that most OCR software cannot recognize
handwritten characters.
- Reference Guide 1
- Contents 3
- 4 Contents 4
- Chapter 4 Options 5
- 6 Contents 6
- Introduction 7
- Finding More Information 8
- Optimizing Scanning 9
- Making the Highlight setting 10
- Making the Shadow setting 11
- 1-4 Optimizing Scanning 12
- Making the Gamma setting 13
- Applying a preset tone curve 13
- 1-6 Optimizing Scanning 14
- Adjusting Color 15
- Making the Saturation setting 16
- Making tone curve settings 17
- Output values 18
- Optimizing Scanning 1-11 19
- If you still have problems 20
- Features 21
- Selecting a Document Source 23
- Selecting an Image Type 24
- Image Type button 26
- Pixel Depth 27
- Scanning Mode 27
- De-screening 27
- Auto Exposure Option 27
- B/W Options 28
- Selecting a Destination 29
- Destination list 30
- Destination button 31
- Destination Name 32
- Resolution 32
- Unsharp Mask 32
- Setting the Resolution 33
- Storage size indicator 34
- Lock button 35
- Using the Settings Dialog Box 36
- Making Configuration Settings 37
- Fast Preview 38
- Eyedropper Sampling Area 38
- Color menu 39
- Display Gamma 40
- Continuous Auto Exposure 40
- Source (Scanner) 41
- No Color Correction 42
- Densitometer menu 43
- Other menu 44
- Using the Scan Button 45
- Using the Preview Button 45
- Using the Preview Window 46
- Using the Densitometer 48
- Using the Preview Buttons 49
- Using Marquees 50
- Making and modifying marquees 51
- Resizing marquees 52
- Using the Marquee tools 53
- Delete button 53
- Duplicate button 54
- Auto Locate button 54
- Marquee number indicator 55
- All button 55
- Using the Adjust Buttons 56
- Auto Exposure 57
- Image Controls 58
- Exposure 59
- Highlight 59
- Tone Correction 60
- Tone Curve editor 61
- Output options 61
- Channels options 61
- Color Adjustment 62
- Gray Balance Intensity 63
- Saturation 63
- Setting Up the Start Button 65
- 2000 Settings 66
- Making PageManager Settings 68
- Chapter 4 70
- Using the Transparency Unit 70
- Removing the shipping screw 71
- Options 4-3 72
- 4-4 Options 73
- Options 4-5 74
- 35-mm film strips 75
- Options 4-7 76
- Mounted slides 77
- Options 4-9 78
- 120/220 film 79
- Options 4-11 80
- 4 x 5 inch film 81
- Options 4-13 82
- 4-14 Options 83
- Non-standard film sizes 84
- 4-16 Options 85
- Options 4-17 86
- 4-18 Options 87
- Options 4-19 88
- 4-20 Options 89
- Options 4-21 90
- Document Feeder 91
- Options 4-23 92
- Loading documents manually 93
- Options 4-25 94
- Document specifications 95
- Document conditions 96
- Other precautions 96
- 4-28 Options 97
- System requirements 98
- 4-30 Options 99
- Connecting the scanner 100
- 4-32 Options 101
- Chapter 5 102
- Maintenance 102
- Problems and Solutions 105
- Fatal error 106
- Option error 106
- Command error 106
- Interface error 106
- Scanner operation problems 107
- Quality problems 115
- Monitor colors 118
- Printed colors 119
- Software setup problems 120
- Sizing Up Your System 125
- Video cards 126
- Monitors 126
- File compression software 126
- Contacting Customer Support 127
- Technical Specifications 128
- A-2 Technical Specifications 129
- Electrical 130
- Environmental 130
- Standards and Approvals 131
- SCSI Interface 132
- USB Interface 133
- Option Interface Connector 134
- Initialization Methods 134
- Transparency Unit 135
- Automatic Document Feeder 136
- IEEE 1394 Scanner I/F Card 137
- Technical Specifications A-11 138
- Glossary 139
- 2 Glossary 140
- Glossary 3 141
- 4 Glossary 142
- Numerics 143
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