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Use r’s M anual
4- 15
Threshold Used t o convert a grayscale im age t o a
bi- t onal im age. The value ranges from 0 t o
255. A low t hreshold value produces a
lighter im age, and can be used to subdue
backgrounds and subtle, unneeded
inform at ion. A high t hreshold value produces
a darker im age, and can be used to help pick
up faint im ages.
Adjust the threshold set t ing by dragging the
Threshold sliding bar to the left or right t o
achieve the desired threshold set t ing.
2 0 0 dpi,
Threshold:5 0 ,
Brightness: 0
2 0 0 dpi,
Threshold:1 0 0 ,
Brightness: 0
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