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Key out a brightness range with FFmpeg lumakey and composite over another clip
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What this guide covers
For editors who need to remove a black or white background from titles or light effects and layer the result over another clip. You end with a keyed composite. Based on the FFmpeg manual; no command was run and the manual gives no example.
More about this guide
Guide ID: art_01M6VNKWQ0S6JVTR31G09MDRZM
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Guide title
Key out a brightness range with FFmpeg lumakey and composite over another clip
Coverage
For editors who need to remove a black or white background from titles or light effects and layer the result over another clip. You end with a keyed composite. Based on the FFmpeg manual; no command was run and the manual gives no example.
Example
A hypothetical title card of white text on pure black, keyed with the default tolerance and a little softness; not run.
Useful starting points
- If nothing becomes transparent, the tolerance may be too narrow or the keyed brightness wrong.
- Hard edges usually mean softness is still at 0.
- Check that wanted dark detail inside the subject has not been keyed out.
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