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Agent skill

Green Screen

by ZJU-REAL in ZJU-REAL/Easel

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…

Apache-2.0Auto-check passedMedia & Creative

Install Green Screen

skills CLI
$ npx skills add ZJU-REAL/Easel --skill green-screen -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ZJU-REAL/Easel green-screen --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ZJU-REAL/Easel.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/openclaw/green-screen .claude/skills/green-screen && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
green-screen
GitHub stars
3.4k
Token cost
~468 tokens
SKILL.md length
82 words
Files
1
Skills in repo
114
Repo updated
First seen
Licence
Apache-2.0

At a glance

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…

  • Works in 6 steps: 幕布色默认绿；蓝幕/其它色用 --color 指定。 → 背景四选一（--bg / --bg-color / --bg-blur），互斥。 → 背景自动缩放裁切到前景画幅、视频背景自动循环补足到前景时长。 → …
  • Tasks that involve Video production
  • SKILL.md covers 输入, 输出（outputs/主题名/）, 执行步骤 and 调参（抠不干净时）, plus 2 more sections
  • Calls python

What it does

Green Screen is an agent skill from ZJU-REAL/Easel. 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。

Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Media & Creative, covering Video production and Image generation. It works with FFmpeg. The repository describes itself as: An open-source AI agent for social media — discover trends, create content, publish everywhere, and learn what works across Xiaohongshu, Douyin, Zhihu, Bilibili, and more.🎨一个开源的… The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Video production
  • Tasks that involve Image generation

Example prompts

  • “/green-screen”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. 幕布色默认绿；蓝幕/其它色用 --color 指定。
  2. 背景四选一（--bg / --bg-color / --bg-blur），互斥。
  3. 背景自动缩放裁切到前景画幅、视频背景自动循环补足到前景时长。
  4. 前景音轨自动保留。
  5. 抠像质量取决于素材（幕布纯净度、打光均匀度）；脚本尽力，但拍摄差无法救回。
  6. 产物统一进 outputs/主题名/。

What it can do on your machine

Read from SKILL.md and the folder at commit 278f420. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Green Screen loads about 468 tokens when it runs. Until then it costs about 70 tokens; SKILL.md has 82 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~70
When it runs · the whole SKILL.md, loaded when a task matches
~468

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ZJU-REAL/Easel at commit 278f420, republished under its Apache-2.0 licence (© ZJU-REAL). 82 words, ~468 tokens.

Download SKILL.mdSave it as .claude/skills/green-screen/SKILL.md (or your agent's skills folder).
name
green-screen
description
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。
layer
produce

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
幕布色否默认绿 0x00ff00；蓝幕用 0x0000ff

输出（outputs/主题名/）

  • 合成后视频（*-composited.mp4）
  • 报告：分辨率、抠掉的颜色、所用背景

执行步骤

脚本路径（相对项目根）：skills/shared/scripts/chromakey.py（key -h 看参数）。

bash
# 合成到图片背景
python skills/shared/scripts/chromakey.py key -i <绿幕视频> \
  --bg <背景图> -o outputs/主题名/<名>-composited.mp4

# 合成到视频背景（背景自动循环补足）
python skills/shared/scripts/chromakey.py key -i <绿幕视频> \
  --bg <背景视频> -o outputs/主题名/<名>.mp4

# 合成到纯色背景
python skills/shared/scripts/chromakey.py key -i <绿幕视频> \
  --bg-color white -o outputs/主题名/<名>.mp4

# 背景=前景自身放大模糊（虚化景深感）
python skills/shared/scripts/chromakey.py key -i <绿幕视频> \
  --bg-blur -o outputs/主题名/<名>.mp4

调参（抠不干净时）

  • 绿边残留 / 抠不净：调大 --similarity（默认 0.30，可到 0.4）。
  • 主体边缘被吃 / 镂空：调小 --similarity，或加大 --blend（默认 0.10）柔化边缘。
  • 主体泛绿（溢色）：脚本已自动 despill；仍明显时说明幕布打光不匀，属素材问题。
  • 蓝幕：--color 0x0000ff。

规则

  1. 幕布色默认绿；蓝幕/其它色用 --color 指定。
  2. 背景四选一（--bg / --bg-color / --bg-blur），互斥。
  3. 背景自动缩放裁切到前景画幅、视频背景自动循环补足到前景时长。
  4. 前景音轨自动保留。
  5. 抠像质量取决于素材（幕布纯净度、打光均匀度）；脚本尽力，但拍摄差无法救回。
  6. 产物统一进 outputs/主题名/。

参考来源

绿幕抠像用 ffmpeg chromakey（按颜色距离生成 alpha）+ despill（抑制主体边缘溢色）+ overlay 合成，是标准无 GPU 抠像方案。把颜色阈值、边缘融合、背景适配封装成确定性脚本。

© ZJU-REAL, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/openclaw/green-screen of ZJU-REAL/Easel.

Open the folder on GitHubat commit 278f420

Compare with similar skills

Green Screen next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Green Screen compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Green Screen this skillZJU-REAL/Easel3.4k—~468Automated safety check: PassApache-2.0
Qiaomu Cutjoeseesun/qiaomu-cut-skill372—~6.8kAutomated safety check: NotesMIT
Video Productionspeechlab0210/video-production-skill105—~4.1kAutomated safety check: NotesMIT
Whiteboard Videognipbao/codex-whiteboard-video-skill327—~7.2kAutomated safety check: NotesMIT
Media Productionleon-ai/leon18k—~999Automated safety check: PassMIT
Content To Videoarchitectds/modeldock117—~2.4kAutomated safety check: PassApache-2.0

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Works with

Categories

Questions about Green Screen

What does Green Screen do?

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…. Green Screen is an agent skill from ZJU-REAL/Easel.

When should I use Green Screen?

Green Screen fits situations like: tasks that involve Video production; tasks that involve Image generation.

How do I install Green Screen in Claude Code?

Run `npx skills add ZJU-REAL/Easel --skill green-screen -a claude-code`. Or copy the skill folder (skills/openclaw/green-screen in ZJU-REAL/Easel) into .claude/skills/green-screen in your project. Claude Code loads it when a task matches its description.

How do I install Green Screen in Codex?

Run `npx skills add ZJU-REAL/Easel --skill green-screen -a codex`. Or copy the skill folder (skills/openclaw/green-screen in ZJU-REAL/Easel) into .agents/skills/green-screen in your project. Codex loads it when a task matches its description.

Can I use Green Screen in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ZJU-REAL/Easel --skill green-screen -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/green-screen, .gemini/skills/green-screen, .github/skills/green-screen and .opencode/skills/green-screen in your project.

What does Green Screen need to run?

Going by SKILL.md and its folder, Green Screen needs the command-line tools its instructions call (python). Our summary lists: Python 3.

Does Green Screen access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Green Screen safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Green Screen use?

Green Screen is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Green Screen use?

About 468 tokens (SKILL.md is roughly 1.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Green Screen?

Skills that share tags, products or a category with Green Screen: Qiaomu Cut (joeseesun/qiaomu-cut-skill, 372 stars), Video Production (speechlab0210/video-production-skill, 105 stars), Whiteboard Video (gnipbao/codex-whiteboard-video-skill, 327 stars) and Media Production (leon-ai/leon, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Green Screen?

ZJU-REAL (a GitHub organization) maintains it in ZJU-REAL/Easel, which has 3,376 GitHub stars. The repository holds 114 skills in this directory. The repository was last updated on October 9, 2026.

Source: ZJU-REAL/Easel on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.