Though the "down and dirty" (one side only) is quick and easy, the little details is what either convinces or not, and people are really used to very good video and will pick up on that, even if subliminally. It was very obvious to me, and I don't even have the best eyesight. Just my 2c and worth every dime.
Aloha karma17, (and our favorite Latin lurker; et al.)
Those sure remind me of the Koolau Mountains... (wink)
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I love that technique... I'll have to give it a try...
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Taking it a step further ... I could actually use a piece of video as the background image...
and an alpha channel still image (.png) for the foreground and give it double the whammy IF I zoom one in and zoom the other image out...
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Until that time. . .