NUANCE OMNIPAGE PRO 6 - REFERENCE MANUAL FOR WINDOWS Reference Manual page 212

• Manual Brightness: Select this setting if you are scanning high-
quality printed documents with crisp, black text printed on a white
background. This is the only option available if you have a black-
and-white scanner.
If text characters on your document appear to be thick and
overlapping, adjust the brightness slide towards Lighten. If
characters appear to be thin and broken, adjust the setting towards
Darken.
You also can evaluate a document during recognition. See the next section,
"The Character Window."
The Character Window
Sometimes a small manual adjustment to brightness can make a big
difference in recognition accuracy for users who have black-and-white
scanners. Manually adjusting brightness can also be helpful on pages with
especially dark shading.
Rescan any document with numerous recognition errors and observe the
Character window during OCR.
The Character window appears while OmniPage performs text
recognition. It shows samples of the scanned image as OmniPage sees
them. Adjust the Manual Brightness control in the Scanner settings panel as
necessary after you observe characters in the Character window.
Improving Accuracy
The Character window
Improving Performance 212