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-shadow value        


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


Default Setting:

The shadow value that the device determines as the default.