Green-screen technology refers to the process of mixing together of two images. This technique removes the color of an image to reveal another image behind. Green is often used as a backdrop for other colors because the image sensors in digital cameras sensitive to color. For this reason, the green camera channel, the least “noise” and can produce a clean mask. In addition, less light is needed to light up green, because of greater sensitivity to the color image sensors. The technology provides results in terms of effects you see in everything from weather forecasts to blockbuster movies.