Solved: unable to get rid of fringe line around mask edge - Adobe Support Community - 10294315
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Maya Zest: Fix dark or black edge alpha Matte when compositing V-ray renders.
A Beginner's Guide to Alpha & Luma Mattes | After Effects Tutorial - YouTube
Solved: How to remove this edge line - Adobe Support Community - 11347211
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Help with Luma key edges - I've tried softening, blur, eroding, lightwraps, but this edge won't go, it's either white like this, or dark if I erode it. Any advice? : r/vfx