I work in live TV . The cameras that are used connect to a base station , which provides audiovideo interface as well as a remote control panel RCP . The video operator called the SVO or V 1 sits in front of the RCPs for all the cameras and uses the controls for iris , shutter , black level , saturation , color gains , gamma , and much more to make all the cameras match each other , as well as conform to technical standards for video and the director ' s vision for how the shot should look . An example of a Sony RCP , probably the most common one out there <| sep |> Say they get told that a period is the wall of the uterus breaking down , then get shown a video that shows it with blue liquid . How would they know what colour the uterus is ? They ' ve never seen it .