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Sets the brightness level of the image that is being acquired. The device must support setting brightness values. Some devices do not support setting the brightness level. The -verbose option will generate a message that will inform whether setting the brightness worked successfully or an error was encountered.
The brightness value can range from -1000 to 1000. The lower the number, the less "bright" the image will be when acquired. Also see the -contrast command to set the contrast of the image.
To set the brightness to a middle value:
To set the brightness to the higheset level:
The brightness value that the device determines as the default. Usually this is a value of 0.