What's with the diagonal line through Finder's video preview thumbnail?

I recently upgraded to Snow Leopard, and while I really like the ability to play video files right from the icon in Finder, the thumbnail icon and subsequent video is split diagonally by a line. The video quality on the upper left portion looks to be the original, and the part to the lower right looks like it has increased contrast (see attached image—look in face and also the wall on the lower left to see what I'm talking about).
This question has been asked on the iPad forum without a satisfactory answer. It appears that it may just be a "stylistic" thing with Finder, but I just like to know these things definitively! Thanks for any input you have!

The effect is a visual effect applied to icons and previews, to give the illusion that you are watching a screen-within-a-screen. It's the same visual effect that's applied to icons in iOS if the developer doesn't specify that it shouldn't (and, in OS X, I believe the developer has the option to do this too when they make a QuickLook plugin for Finder). The effect in only applied to previews, never to opening / viewing the item in an application.

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MacPro bought in 2010
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MacBookPro7,1
Intel Core 2 Duo
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Nombre total de cœurs :          2
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Version de la ROM de démarrage :          MBP71.0039.B0B
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Identifiant de révision :          0x00a2
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Is that what you asked ? Do you need other data ?
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What's with the diagonal line through Finder's video preview thumbnail?

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