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Cleaning up JPGs

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Anyone know of any good techniques / tools for cleaning up compression artifacts in jpgs? In particular the ghosting next to sharp edges. Thanks, T.

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Simplest way: DON`T use Jpeg ;)

There is no easy way besides cleaning up pixel by pixel. Jpeg is a lossy compression format. And creates artifacts by this. Lost informations cannot be restored. And that's why you better avoid Jpeg when you need a clean chroma keying.

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