Final answer:
Chroma-key technology is widely used in television production to replace a single-color background with a different image or video, especially for news weather segments, and in creating special effects for movies and TV shows.
Step-by-step explanation:
Chroma-key is a technology used extensively in television production that allows the replacement of a solid-colored background, often green or blue, with another image or video. This is utilized in various ways, such as placing news presenters in front of a virtual set, allowing weather forecasters to gesture to maps and graphics that are not physically present, or by creating fantastical environments in film and television shows. For a chroma-key setup to be effective, proper lighting is imperative to avoid shadows and to ensure a clean key without spill.
Examples of effective chroma-key uses include weather segments in news broadcasts, where meteorologists stand in front of graphic weather maps, or in special effects-heavy films and television shows like superhero movies or sci-fi series, where actors perform in front of green screens that are later replaced with complex digital landscapes.