How can I change a white background in a .mov to transparent?

Someone has sent me a .mov that I need to use in a project, but unfortunately the video has a white background and I need it to be transparent. How would I go about doing this using CS5? Thanks.

Depends on the rest of the content. If the forground items do not contain to many bright colors, a simple extraction based on lightness e.g. based on the Shift Channels effect, followed by Invert and Levels adjustments would give the cleanest results. Other than that try the various keying tools (Luma Key, Color Key, Color Difference Key), but don't use Keylight. And of course you can always try Rotobrush in CS5...
Mylenium

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