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Elvis Joined Celine Dion While She Performed On Stage, And Everyone Was Stunned

Although what you are about to see appears unbelievable, there is a logical explanation. The technique of rotoscoping has been used by animators for over one hundred years, and involves cutting an object out of a scene to use on a new background. While the process was once only applicable to animations, the advent of green screen technology has made rotoscoping possible with live videos. In this way, modern-day special effects were born. These facts aside, it's rare to see rotoscoping used during a live performance. When Celine Dion took the stage on "American Idol" in 2009, fans of the five-time Grammy winner erupt with joy. However, it's her duet partner, a man who has been dead for over thirty years, who really steals the show.
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