OS X's icon preview doesn't match JPEG

Hi all,
I have a few photos that were passed to me. In the icon preview, they were the original photos. But when I opened them in Preview or iPhoto, they were the Photoshopped versions.
Anyone know what's going on? And how to extract the icon previews?
Thanks!

But when I Get Info on the JPEG, the icon shown is for the modified image.
Additional info that I stumbled upon:
When resizing the icon preview in Finder, after a certain (larger) size, the icons would change to the modified versions. Shrinking the icons would bring back the original unmodified versions.
Really strange behaviour...

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OS X's icon preview doesn't match JPEG

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