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Sets the highlight value for the images to be acquired. The device must support setting highlight values. Some devices do not support setting the highlight level. The -verbose option will generate a message that will inform whether setting the highlight value worked successfully or an error was encountered.
The highlight value can be any numeric value between 0 and 255, inclusive.
The highlight setting is an advanced setting that allows the device to set a minimum "light" color that the image will use. Any color that would be lighter than the highlight is equal to the highlight value. See also -shadow to set the darkest color to use in the image.
Example: Acquire a BMP image named test.bmp. The color is RGB, and the highlight value used is 70.
twainsave -f test.bmp -color 2 -highlight 70
The highlight value that the device determines as the default.