That image was put there using a chroma key effect. You've probably watched the news on TV and seen someone talk about the weather while a giant map behind them illustrates what they're saying. Or you could create an environment entirely out of computer graphics! Some of these techniques are also used outside of filmmaking. You can edit almost anything into the background: footage from other locations, artificial sets, paintings, or even close-up footage of miniature sets placed in the background to make it look like the actors are in a full-sized version of the model.
This is where the versitality of the effect comes in. By using a function to make everything that is the colour of the background screen invisible, you can then replace it by editing it the footage of something else. This screen is usually blue or green, hence chroma key is often referred to as a 'blue screen' or 'green screen' effect.ĭuring editing, computer programs are used to remove and replace parts of the footage.
They can't all be real places or constructed sets, right?Ĭhances are, they used a technology called chroma key.Ĭhroma key involves filming actors and objects in front of a flat screen of a single colour. Ever watched a movie and wondered how they got the actors in those fantastic and otherworldly locations? Or how they put them in life-threatening situations?
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