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Chapter 4
Preference settings 79
Brightness
The brightness setting for scanning a page works like that on a
photocopier. This setting can compensate for variations in paper and
print quality, so it can have a big influence on OCR accuracy.
Click the Manual Brightness check box and move the slider to lighten
or darken the brightness for your scanning.
The following illustrates optimum and unsuitable brightness.
Contrast
The contrast setting for scanning a page works like that on a television
set. This setting is only activated if you have Grayscale or Color
selected in the Scanner settings. It lets you increase or decrease the
difference between light and dark areas on the image. Click the
Manual Contrast check box and move the slider to make a contrast
setting.
Note Some scanners offer only automatic detection for brightness and contrast. Some
require a manual setting. Others offer both methods. In this case, automatic
detection may be better; some scanners do this dynamically, varying the setting for
different parts of the page. If results are disappointing, try using manual
adjustment.
Unsuitable
Tolerable
Good
Best
Good
Tolerable
Unsuitable