Glossary Current: K K Keying — The process of compositing https://wikipedia.org/wiki/Compositing multiple images together. There are multiple different forms of keying. The most well-known is chroma-keying https://wikipedia.org/wiki/Chroma_key (“blue screen”, “green screen”). In broadcast, typically various forms of alpha-keying https://wikipedia.org/wiki/Alpha_compositing are used. ×