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Shrink and grow masks with FFmpeg erosion and dilation
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What this guide covers
For editors cleaning a matte or mask by one pixel step at a time. It explains the 3x3 minimum and maximum behaviour and per-plane limits. Based on the FFmpeg manual and not run, and it uses no real matte.
More about this guide
Guide ID: art_01M6WBG504RFYZB01AT9BXAPBK
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Guide title
Shrink and grow masks with FFmpeg erosion and dilation
Coverage
For editors cleaning a matte or mask by one pixel step at a time. It explains the 3x3 minimum and maximum behaviour and per-plane limits. Based on the FFmpeg manual and not run, and it uses no real matte.
Example
A hypothetical key matte with small speckles: erode once to drop the speckles, then dilate once to restore the main shape. Nothing was run and the manual does not describe this pattern.
Useful starting points
- If nothing changes, check that the plane threshold has not been set to 0.
- Erosion shrinks bright areas and dilation grows them; swapping them gives the wrong direction.
- Keep the neighbour setting at its default of all eight pixels unless you need a directional effect.
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