-threshold

-threshold value        

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

Default Setting:

The threshold value that the device determines as the default.  Usually this is 128.