The word green is associated with environment in the minds of the readers. The word multimedia green screen has nothing to do with environment. This is technique, which is useful in many ways. You have seen the weatherman reporting about the weather ion the TV. There is a presenter, he points towards some objects and the whole background is totally different. This type of multimedia presentation is possible because of the multimedia green screen technology.
For a simple understanding let us make it step by step. In first step the presenter is present in particular pose against the background of green screen. The presenter may be pointing towards some object in the background. The use of green screen is responsible for the name multimedia green screen technique. In the second step you have a background shot. In the third step these two are merged as a composite in to each other, where we get what we always see. What is the procedure followed in the multimedia green screen technique?
First you take a video shooting of a person against the green background. Now use digital editing software like Adobe Premier and make that color transparent. This is necessary as we want to layer a video clip behind it. The background must be evenly lit up. The professionals use special purpose green backgrounds here. You can shoot against green painted wall. Is it necessary to use green color only? No, you can use blue color also.
In fact we can call this multimedia green screen technique as the multimedia blue screen technique also
Now you digitize the movie in the iMovie. Now export the uncompressed movie from iMovie. Now use the Adobe software to pull the green screen effect. The green screen clip is in video2 layer. Now do the transparency effect. At the finger point make a cut in the clip. Now keep background intact and complete the work. Now import the beach video shot to video1 layer. This has to be below green screen as we want it behind it.
Now you can import a still clip if you want to add it, at this stage. Now use hand icon to remove the green background. Make sure that page Curl icon is selected. Now see the video replacing the green screen. You can use magnifying glass feature to fine tune the image. Using transparency box in the effects control panel you can get the desired effect.
Thus a video of a person enjoying the beach walk is produced. We had one movie of a person in green background. We had another movie showing the beach. We merged the two and had an effect of a person on the beach.
The multimedia green screen technique has lot many industrial applications and special studios cater to ever increasing demand of the multimedia green screen technique products.
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