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Yesterday i was in the police control room, one of the CCTV monitors was showing an office that was being heated by an electric fire / heater. The room was painted white and the glow from the fire / heater made the room appear red.Then a car pulled up to the junction opposite the room, headlights on full beam, shining straight through the window. At this point the CCTV image went green! Why did that happen?
or the room you were monitoring through the CCTV?
It could be a negative post image in the camera itself, because some (posher) cameras do automatic white balancing - this is trying to make a white thing look white electronically, even if it is being illuminated by yellow light from an incandescent bulb. Your eyes do the same thing, but if the room was being lit by a very red heater, this white balanceing is going to be working in overdrive so if something actually white shined in it would look a strange colour.
if the glow of the 'red' heater was in fact magenta