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绿幕抠像 / 换背景 / 合成：把绿幕（或蓝幕/指定色）拍摄的前景人物抠出来，合成到新背景——图片、视频、纯色或前景自身模糊。当用户说 绿幕、抠像、抠图换背景、去绿幕、chromakey、绿幕合成、换背景、蓝幕、把绿幕背景换掉、人物抠出来、绿布 时使用。基于 shared/scripts/chromakey.py（ffmpeg chromakey + despill）。与 video-reframe 区别：reframe 只改画幅不换背景；与 ai-image-gen 区别：那个生成新图，本 SKILL 处理已拍的绿幕素材。

skills/builtin/green-screen/SKILL.md

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Nov 9, 2026

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Nov 9, 2026
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Apache-2.0

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# 绿幕抠像 / 换背景合成

> 把绿幕前景抠出来合成到新背景。全部走 `skills/shared/scripts/chromakey.py`，
> **不要手拼 chromakey/overlay 滤镜**——脚本已处理抠像、溢色抑制(despill)、边缘融合、
> 背景缩放、音轨保留。

> 只改画幅见 **video-reframe**；从零 AI 生成画面见 **ai-video-gen**；通用剪辑见 **video-editing**。

## 输入

| 字段 | 必填 | 说明 |
|------|------|------|
| 前景视频 | 是 | 绿幕/蓝幕拍摄的素材（没给就问） |
| 背景 | 是 | 四选一：图片 / 视频 / 纯色 / 前景自身模糊 |
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