Brightness Settings For Black & White Images (Threshold Value) - Canon CanoScan FB 1200S User Manual

Brightness Settings for Black & White Images (Threshold Value)
When the scan mode is set to black and white, the image brightness can be adjusted.
The threshold value setting determines whether a halftone will be expressed as a black or
a white data point. The possible threshold values range between 0 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.
Threshold Value = 128 (Standard)
To Set the Threshold Value
When the scan mode is set to black and white, click the [Tone adjustment]
button or pull down the Image menu and select [Tone adjustment].
To restore the threshold setting to its default value, click this [Reset] button.
Hint
The changes will be reflected in the preview image.
Threshold Value = 180
Drag the slidebar left or right to adjust the
threshold setting.
Click the up or down arrow to increase or
decrease the entry in the text box, or enter the
value (0~255) directly from the keyboard.
After adjusting the threshold value, you can
save the setting to a file under a file name and
load the file again whenever you want to use
the setting.
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Threshold Value = 70