The Chroma key technique is the process by which a specific color is removed from an image, allowing that portion of the image to be replaced. This color can be any solid color, most commonly blue or green. Chroma keying can also be used as a verb for the act of removing a solid color from an image. This means that the sentences, “I used a chroma key on the video,” and “I chroma keyed this video” are both correct. The technique can also be referred to simply as “keying” or “keying out.”