Used to convert a grayscale image to a
bi-tonal image. The value ranges from 0 to 255. A low threshold
value produces a lighter image, and can be used to subdue
backgrounds and subtle, unneeded information. A high threshold
value produces a darker image, and can be used to help pick up
faint images.
Adjust the threshold setting by dragging the Threshold sliding bar to
the left or right to achieve the desired threshold setting.
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