Chroma key is the technology used to create a different background for a video. A common example of chroma key is that of the TV weatherman.
The TV weatherman is taped with the weatherman standing in front of a blue or green screen. The blue or green background is then substituted for a weather map background. In order to accomplish this feat, you will need a blue or green background. You can use fabric from a fabric shop or even Wal-mart. You will need a video camcorder, a computer with plenty of memory and hard drive space. You also need chroma key software such as Adobe's Ultra CS3 or Adobe's Premiere Pro. There are others available but in my opinion Ultra is the easiest to use
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