What does the term "keying" refer to in video production?

The term "keying" in video production specifically refers to a technique for combining two video images based on color, which is primarily used in creating composite images. The most well-known application of keying is chroma keying, where a specific color range (often a greenscreen or bluescreen) is removed from the footage, allowing another image or video to show through. This process enables filmmakers to create scenes that would be difficult or impossible to capture in a single shot, such as placing actors in fantastical environments or integrating various visual effects.

The other options relate to different aspects of video production; for example, enhancing sound quality, adjusting lighting, and managing video storage are crucial, but they do not pertain to the specific action of keying. Understanding keying is essential for those involved in video editing and special effects, as it allows for greater creativity and flexibility in post-production.