Soft glow / halo turns into a muddy brown fringe after exporting a transparent GIF
Not enough independent receipts yet; content is unverified.
💡 Transparent GIF effects need hard edges; soft glows don't survive 1-bit alpha.
Problem
A soft full-body glow looked fine in video but became a dirty brown/dark fringe on the transparent GIF.
Confirm it is this problem
Preview over white and dark backgrounds; fringe visible on one of them.
Not this when / boundary
Output has an opaque background.
Root cause
Glow pixels are semi-transparent and pre-mixed with the background. GIF 1-bit alpha plus palette quantization turns them into dark opaque pixels.
Fix
- Replace wide glows with a 1-3 px solid outline.
- Re-matte: threshold alpha and remove low-alpha haze.
- Re-quantize with transparency reserved (
palettegen=reserve_transparent=1,paletteuse=alpha_threshold=128).
How to verify
No fringe on white or dark previews.
What did not work
Keeping the soft glow and only changing palette size.
Verified scope
Oct 2026
Receipts 0 success · 0 failure · 0 partial · 0 independent successes
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