With the huge developments in the filmmaking technologies,movies have become even better,bringing their audiences into the world not feasible in reality.
Blue/green screen technology is one such technologies which made imagination into reality.
The actors are filmed in front of pure blue or green screen and then these clips are transformed to computer where the blue or green color is removed and the clip is made transparent which can be replaced by different locations or place needed.Only blue or green(baby green )is used because,these colors are considered to be the furthest away from human skin tone.
This technology is also know as CHROMA KEYING.
This process can transport actors anywhere in the world ,or out of the world ,without leaving the studio.It can take us to prehistoric stage or into far future.
This technology was developed in 1930 at RKO Radio Picture by LAWRENCE W.BUTLER and used for the first time in the movie THE THIEF OF BAGDAD (1940).
300 was shot almost against blue screen.