Nuance omnipage direct 2 for windows User Manual

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How to Improve Performance  31
Chapter 4
How to Improve
Performance
You can make Direct run faster and recognize text more accurately by 
learning how to use a few different settings. 
Speed up Direct by de-selecting Auto Intensity and by manually 
adjusting other options instead of using the default Auto settings. 
Improve text-recognition accuracy by using the Character Win-
dow to adjust the Brightness setting and by taking into account 
document quality, scanning angle, and paper transparency.