Setting brightness and gamma with highui functions

Hello,

I use the highgui-functions cvCaptureFromCam(..) and cvQueryFrame(..) for
grabing pictures from my Labtec webcams (module: spca5xx).It works fine with
up to 5 cams.

Is it possible to set some settings like brightness, gamma, constrast,
...???

Would be very thankfull for every help.
Paul

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