As you back off from the target, do any of the lights in the room come in to the camera's field of view?
Do you have auto-exposure and auto-white-balance enabled on the camera?
I uploaded two screenshots in a different thread showing lighting differences. In one you'll see we are far away such that the classroom lights are in the field of view. In the other screenshot, we are much closer, and the classroom lights are no longer in the field of view. When auto-exposure and auto-white-balance are enabled, you'll see a big difference in "lighting" on the camera.
http://www.chiefdelphi.com/forums/sh...98&postcount=2
__________________
In life, what you give, you keep. What you fail to give, you lose forever...