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In Wicked, wicked-witch-to-be Elphaba (Cynthia Erivo) is ostracized by her fellow Ozians because of her green skin and her magical powers. But on the set of a big-budget Hollywood studio production that leans heavily on visual effects instead of magic, she has her own viridescent foe: green-screen technology.Vivid green backdrops — often referred to as “chroma green” by digital artists — are used in modern VFX processes, in part, because that tint is so far from the color range of human skin. That makes it far easier for visual effects artists to digitally select anything in an image that’s chroma…

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