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Use r’s M anual
4- 15
Thresh old Used to 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 ation. A high threshold value produces
a darker im age, and can be used to help pick
up faint im ages.
Adjust the t hreshold set t ing by dragging t he
Threshold sliding bar to the left or right to
achieve the desired threshold sett ing.
2 0 0 dpi,
Thresh old:5 0 ,
Br ight ness: 0
2 0 0 dpi,
Thresh old:1 0 0 ,
Br ight ness: 0
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