Keyer

A keyer, also known as a chroma keyer or green screen keyer, is a tool used in video production and editing to remove a specific color from a video or image. This technique allows the user to replace the removed color with a different background or overlay, creating the illusion that the subject is in a different location or environment.

Keyers are commonly used in film and television production, as well as in live streaming and video conferencing. They are especially useful when shooting scenes that are difficult or impractical to film on location, as they allow for the creation of virtual sets or backgrounds.

There are different types of keyers available, including hardware-based keyers and software-based keyers. Hardware keyers are standalone devices that are connected to the video production equipment, while software keyers are integrated into video editing software.

Keyers typically work by analyzing the color values of the video or image and removing pixels that match a specific color range. The most commonly used color for keying is green, hence the term "green screen." However, other colors such as blue or even specific shades of gray can also be used.

Overall, keyers are a powerful tool in video production that allow for creative and visually appealing effects by removing and replacing specific colors in a video or image.