Calibrating a webcam (CMU Cam)

Hello,
I'm new on this group.
I have a CMU-Cam2 on my robot and I'd like to know if you have tips to calibrate the camera.
I explain: the RVB parameters of an object are very sensible to the illumination and I'd like to know if there is a solution to get the colors more independant of the light.
Thank you very much.
Gremlins.
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