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10.4: Add Spotlight keywords to images with Preview
Authored by: SeanAhern on Oct 07, '05 02:17:10PM

I think it's likely that it's being recompressed. Recall that JPEG compression involves color manipulation so as to remove colors that the eye "cannot see".

I took your two images that were side by side, brought them into Photoshop, and differenced them. The resultant image was almost black, but not quite. Once I adjusted the contrast to highlight the differences, you can easily see a variation. See here.

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