Chroma keying is a technique used in video production and post-production to remove a background from the subject of a photo or video. A color, usually green or blue, is made transparent, revealing another image behind. This allows two separate images or video streams to be layered together seamlessly. The technique is commonly used in news, movies, and video games to place subjects in virtual environments without having to physically be there. Proper lighting of both the screen and subject is important to achieve a clean composite.

1. Green Screen
Hannah Knipe

2. About Green Screen
Chroma key compositing, or chroma keying, is a special effects / post-
production
technique for compositing (layering) two images or video streams
together based on
color hues (chroma range). The technique has been used heavily in
many fields to
remove a background from the subject of a photo or video –
particularly the
news casting, motion picture and videogame industries. A color range
in the top layer
is made transparent, revealing another image behind. The chroma
keying technique is
commonly used in video production and post-production. This
technique is also
referred to as color keying, colour-separation overlay (CSO; primarily
by the BBC, or
by various terms for specific color-related variants such as green

3. How did I set up green
screen?
• Make sure there are no crinkles in the
material.
• Then set up the lighitng.

4. How do I light a green
screen?
• You will have two soft boxes lighting the green
screen.
• Then a single light, lighting the model.

5. What is the point in using
green screen in your Web
drama?
• It is cheaper.
• You can use any location you want without
having to actually go there.
• You can exaggerate the size of scenes.

6. Final image

7. What I did
You can see that I have used green screen to edit this
photograph of myself. I started by putting the
photograph on photo shop and I then added another
layer of London I then had to put round to get rid of
the green screen and then merged the two together so
it looked as though I was in front of Big Ben.