Canon FB630U - Manual (Page 54)

54
S T E P 4
When the scan mode is set to Black & White (Line), the image brightness can be
adjusted. The threshold value setting determines whether a half tone will be expressed as
a black or a white data point. The possible threshold values range between 1 and 255.
Below a given threshold value, all data is converted to black. Likewise, all data with a
value above the threshold is converted to white. Accordingly, higher threshold values
produce darker images while lower threshold values result in brighter images.
To Set the Threshold Value
Set the threshold value in the Control Panel.
The threshold value adjustment categories will only appear when the scan mode is set
to Black & White (Line), the image brightness can be adjusted.
Hint
The changes will be reflected in the preview image.
Brightness Settings for Black & White Images (Threshold Value)
Threshold Value = 128 (Standard) Threshold Value = 70 Threshold Value = 180
Drag the slider left or right or click on the left or right direction arrows to
change the threshold value to the desired setting.
The value in the box will
change as the slider or
direction arrows are moved.
A value may also be input
directly into the box without
moving the slider.
Click the arrow to restore the
default values. (128)