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