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A-63055 December 1999 10
Brightness
This function allows you to adjust the image brightness, making it
lighter or darker. There are two Brightness modes,
Automatic
and
Manual
, and three preset modes,
Darken
,
Norm
, and
Lighten
.
Select the
Manual
radio button in the Brightness group box. You can
adjust the brightness setting by dragging the Brightness sliding control
bar. Select a value from 1-255. The default is 128. The smaller the
number, the darker the image. You also can click on the
Darken
,
Norm
,
and
Lighten
buttons to adjust the brightness setting. Scan the
document and check the brightness.
• Manual—allows you to increase or decrease the brightness
setting.
• Automatic—sets brightness according to the scanning resolution.
NOTE: Refer to the section entitled “Binary Mode Automatic
Threshold” for information about setting automatic
brightness by Binary mode.
• Darken—sets a low brightness value (51), which is better for
scanning light originals.
• Norm—sets an average brightness value (128).
• Lighten—sets a high brightness value (205), which is better for
scanning dark originals.
Brightness 51 Brightness 128 Brightness 205
A darker setting is recommended for blurred character documents.
With a brighter setting, background noise in a color document
disappears.