What does "green screen" technology enable filmmakers to do?

"Green screen" technology allows filmmakers to replace backgrounds with digital images or videos. This technique, also known as chroma keying, involves filming a subject in front of a bright green or blue screen, which can then be digitally removed in post-production. The green or blue color is chosen because it is distinct from human skin tones and most wardrobe colors, making it easier to isolate the subject.

After the background is keyed out, filmmakers can layer in any desired background, ranging from realistic landscapes to abstract graphics, enhancing the storytelling by creating immersive environments that would be difficult or impossible to achieve with physical sets alone. This method is commonly utilized in science fiction, fantasy films, and various television productions, allowing for a range of creative possibilities that can transport audiences to different worlds.

The other options describe processes or techniques that do not align with what green screen technology specifically offers. For example, creating live backgrounds for scenes pertains more to traditional set design rather than digital manipulation. Editing audio tracks relates to sound production rather than visual effects, and using physical props pertains to practical effects, which differ significantly from the digital enhancements provided by green screen technology.