Which term specifically refers to the technique of isolating and removing a color to composite imagery?

• A. Color key
• B. Chroma key
• C. Depth of field
• D. Video editing

Answer: (A)

Chroma keying is the technique of isolating a specific color in a scene—typically green or blue—and removing that color so another image or video can be composited behind or in place of the subject. The process works by selecting a color range and making those pixels transparent, then layering the replacement background in its place. This approach is what makes the subject appear as if they are in a different environment, which is exactly what compositing aims to achieve. While some people may casually refer to it as a color key, the standard term used in production is chroma key because it specifically describes color-based isolation for compositing imagery. The other terms don’t capture this targeted color removal: depth of field relates to focus range in a shot, and video editing is a broad workflow rather than a specific color-based compositing technique.