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Sets the threshold value for the images to be acquired. The device must support setting threshold values. Some devices do not support setting the threshold level. The -verbose option will generate a message that will inform whether setting the threshold value worked successfully or an error was encountered.
The threshold value can be any numeric value between 0 and 255, inclusive.
The threshold setting is an advanced setting that allows the device to determine the "dividing line" between black and white. The -threshold can only be used on black and white (color 0) images.
Example: Acquire a BMP image named test.bmp. The color is monochrome (black and white), and the threshold value used is 100.
twainsave -f test.bmp -color 0 -threshold 100
The threshold value that the device determines as the default. Usually this is 128.