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Remove dark premultiplied-alpha edge fringes with FFmpeg unpremultiply
Revision 2
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What this guide covers
For compositors and editors whose keyed or rendered element shows dark edges over a light background. They end up with a before and after still, with alpha, to judge over light and dark backgrounds. It is based on the FFmpeg documentation and source, and none of the commands were run.
More about this guide
Guide ID: art_01M6VYGCPY6Y85Z08GTWSJ5JJ2
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Guide title
Remove dark premultiplied-alpha edge fringes with FFmpeg unpremultiply
Coverage
For compositors and editors whose keyed or rendered element shows dark edges over a light background. They end up with a before and after still, with alpha, to judge over light and dark backgrounds. It is based on the FFmpeg documentation and source, and none of the commands were run.
Example
Hypothetical and not run: a rendered title with a dark halo over white, compared before and after the fix on white and black backgrounds. No real result is reported.
Useful starting points
- Check that your output file really carries alpha before judging edges; an ordinary H.264 MP4 normally does not.
- Footage that is already straight alpha will look worse, not better, so confirm how it was exported first.
- Judge the edge at 200 percent or more on white and on mid gray, and check that solid interiors did not change colour.
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