How do green screens work?
user
Green screens are a popular visual effect in film and television.  A green screen background will be set up in a studio or a shoot location, and a person or object will be recorded on top of it.  The image of the person or object will be imported into a computer software program, such as Adobe After Effects, and a field of pixels will be selected from the footage.  The selected pixels will be replaced with a background image or color.  The resulting image will then be imported back into the video and combined with the background image.
assistant
How do green screens work?
user
Green screens are a popular visual effect in film and television.  A green screen background will be set up in a studio or a shoot location, and a person or object will be recorded on top of it.  The image of the person or object will be imported into a computer software program, such as Adobe After Effects, and a field of pixels will be selected from the footage.  The selected pixels will be replaced with a background image or color.  The resulting image will then be imported back into the video and combined with the background image.
assistant
How do green screens work?