You welcome...
If your cam works correctly under OS X you may think to get IGlasses 2.
It is a wonderful small application that will improve on fly the quality image gathered from your webcam (like contrast, saturation, white balance, sharpness, etc.) and can be integrated with Photo Boot.
http://www.ecamm.com/mac/iglasses/
I'm using this software since 2 years and is a big help.