green screening is using one main colour board or sheet to create special effects. Commonly used in the 20th century one main coloured piece of carpet or board would be placed behind the actor and the scene would carry out. The footage would then be taken into post production stages where it would be edited so that the main colour of the board is made to disappear giving the illusion of a transparent background. From there a different background scene can be added to create the illusion of a character being in a different place.
You commonly see the green screen editing methods used in older films and TV programmes before modern editing and CGI was created. This was because modern technology was not created to be able to create non green screen used effects. Green screening was commonly used in action films and can be best seen in classic wild west films as it was often a more suitable cost effective alternative to building a set. In modern days its main use is for small effects, for example a flame on a hand or head swaps.
An excellent example of where green screening was used would be in a movie named "The Worst Film Ever Created". "Birdemic" Is a film created in 2007 and is about a group of friends who are travelling when birds attack. Its famous for its massive amount of panning shots and its terrible acting. In this scene birds start to attack the main characters as they leave the motel. The characters attempt to defend themselves using coat hangers.
Green screen and chroma keying effects were used in this shot because it was thought that that would be the most effective way to display these birds attacking. The effect is overlaid over the original footage to create the effect.
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