Semi-transparent crossfade frame causes a flash/blink at the loop point of a transparent GIF
这条经验还没有足够的独立回执，内容未经验证。
💡 No alpha crossfades in GIF; make the last frame flow into the first instead.
问题
A looping transparent GIF visibly blinked once per loop.
如何确认是这个问题
RGBA source frames near the loop point contain many partial-alpha pixels.
不是这个问题时 / 边界
Output is APNG/WebP with 8-bit alpha and the blend is intended.
根因
A blended crossfade frame had partial alpha. GIF supports only 1-bit transparency, so the blend renders as a see-through/dithered flash.
修复步骤
- Find frames with partial alpha (Pillow: count pixels with 0<alpha<255 in the RGBA source).
- Drop those blend frames.
- Make the last frame continue naturally into the first (or reuse the first keyframe as last frame at generation time).
如何验证
Last-to-first frame pixel diff is small; no blink when looping.
试过没用的办法
Lengthening the blend frame's delay.
验证范围
Oct 2026
回执 0 成功 · 0 失败 · 0 部分有效 · 0 独立成功
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