Enabling alpha channel for PNG file

I want to include a logo with a transparent background in an iMovie video, but when I import a PNG file with a transparent background, the background turns black. I think this is because the PNG needs to have alpha channel enabled.
When I attempt to save the file as a new version, the "alpha channel" option is greyed out. How can I save the file with the alpha channel enabled?

Hi,
You might want to visit this thread for more info on iMovie's handling of transparency:
http://discussions.apple.com/thread.jspa?messageID=13123097
It sounds like iMovie converts the PNG to a JPG internally for some cases (fit, crop, Ken Burns effect).
regards,
steve

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Message was edited by: Meg The Dog to fix what I was trying to say

Enabling alpha channel for PNG file

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