In stage lighting, actors typically are lit from two sides one "hot" (orange) and one "cool" (teal): http://en.wikipedia.org/wiki/McCandless_Method#McCandless_

In stage lighting, actors typically are lit from two sides one "hot" (orange) and one "cool" (teal): http://en.wikipedia.org/wiki/McCandless_Method#McCandless_Method http://en.wikipedia.org/wiki/McCandless_Method#McCandless_Me... This is hardly a new digital phenomenon, it's done because it works. The digital editors are emulating what's been done using colored light for 90 years.