In this series of lessons we’ll learn how to use the tracker built in to After Effects to analyze real life footage and find the movement of objects. This is an important technique for matching an image or animation’s position, rotation, scale and perspective skewing to footage.
We’ll begin this project by doing a simple one point track using some easy footage and how to apply that movement information to other layers. We’ll then learn how to do a two point track on real footage and create a black-bar effect over someone’s eyes. Lastly, we’ll track the four corners of a television screen to replace the image on the screen. We’ll then learn some tips for getting a track from difficult footage using color correct techniques.

http://www.digitaltutors.com/09/training.php?cid=29&pid=206

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