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Sets the shadow value for the images to be acquired. The device must support setting shadow values. Some devices do not support setting the shadow level. The -verbose option will generate a message that will inform whether setting the shadow value worked successfully or an error was encountered.
The shadow value can be any numeric value between 0 and 255, inclusive.
The shadow setting is an advanced setting that allows the device to set a maximum "dark" color that the image will use. Any color that would be darker than the shadow is equal to the shadow value. See also -highlight to set the lightest color to use in the image.
Example: Acquire a BMP image named test.bmp. The color is RGB, and the shadow value used is 100.
twainsave -f test.bmp -color 2 -shadow 100
The shadow value that the device determines as the default.