GREENSCREEN

                           Greenscreen (Bluescreen)

It's a shoot trick which is the most favourite one. It provides to superimpose two

 different images. So, impossible, expensive or dangerous stages can be filmed. 

Its other name is "chroma key". There are three different chroma key. 

Greenscreen is the most preferred one. This technique is carried out in a studio

 named "greenbox". 

Firstly, Larry Butler used this technique in 1940 in the film "The Thief of 

Bagdad". Almost in every film and advertisement this technology is used. If one 

uses greenbox, he can both make less expense and save time. Moreover, there is 

no danger in this system. For example, one have to shoot a stage that people 

who look at the Eiffel Tower. So he has three choice. First, he can go to Paris 

with the crew or he can desist from this project or he can use the greenscreen

 technology. So he makes profit via this technology. By this technique, he can 

shoot his film in studio, but it seems to be filmed in Paris. So finally I can say 

that , this greenscreen method is both esthetic and gainful.