Most movies nowadays that we watched on screens have special effects like The Matrix, Superman, Pirates of the Carribean and e.g.. The stunning display of unique environment and mind boggling effects could drop the jaws of any viewers who finds it fascinating. Of course though, most of the scenes in the movies are not real in reality because we know it is made up. The falling of a man into a massive ravine, or leaping from buildings to buildings are literally impossible but virtually possible. Now the question is, how did they made the special scenes come to real in the movies? They couldn't have actually screened a man leaping from buildings to buildings. Its just not possible because of the risk involved whether stunt-man or not. The not-so-secret secret lies in 'using green screens and blue screens' when filming these scenes.
There isn't any difference between green and blue screen actually. The methodology and techniques are the same. The illusion is created by a special effects technique known as traveling matte or blue screen. This technique allows actors and scale models to find themselves in totally imaginary situations -- in space ships, dangling from rope bridges over gorges, flying through the air (a la Superman) -- and have it look completely real in the theater. The technique is used so often now that you don't even realize it. News reporters are made to look like they are on location when they are not, and complete segments in TV shows can be created this way to make it look like the segment was filmed on location.
With computers, blue screen shots are even easier because the computer can create the mattes and combine the shots automatically. Many of the links on the next page describe different digital techniques.
The next time you go to a movie, you'll understand how they make some of these impossible shots -- but you can still be amazed at how real they look.
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