How do I configure the brightness, contrast and colour settings of the built-in HD Camera on iMac?

I have recently purchased an iMac after making the switch from PC.
I am struggling to find an app, or settings configuration where I can modify the brightness, contrast, color and white balance settings for the built-in HD camera. The online manuals didnt give me any answers so I thought I would turn to the communities pages for some help.
The room where the iMac is situated has a light behind me and I am facing the wall so not much light in front of me except the ambient light from the screen. Friends on FaceTime, Skype etc. say that the picture from the built-in camera is too dark and difficult to make out my face clearly. How can I fix this?
Any and all help is most welcome.
Thanks
UKRichard

I would move it if it weren't the main room light that is fixed to the ceiling. Not remodelling my house just for the iMac camera. On my old PC all the webcams came with utilities to adjust these settings, I am surprised Apple dont have something similar for free.
I did see another post about iGlasses here, but not sure I want to pay $10 just to adjust my camera settings
Message was edited by: ukrichard

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