Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIGitHub CopilotGitHub CopilotGemini CLIGemini CLI+20 more

    subject cutout

    1

    Automated chroma keying, AI background removal, and realistic compositing for FableCut projects.

    $7

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    subject cutout

    subject cutout

    Example session with this skill installed

    I have a video of me on a green screen (media_123) and a background of a forest (media_456). Put me in the forest, fix the green fringe, and make it look natural.

    • Read your context and instructions
    • Compiled the subject cutout

    I have composited the green screen footage onto the forest background. I placed the subject on track V2 and the background on V1, applied chroma keying with spill suppression, and added a slight blur to the forest to create depth of field. I also added a contact shadow to help ground the subject.

    Composition Strategy: Green Screen Key & Match

    TrackMedia IDEffectSettings
    V2media_123Chroma Key#00ff00, Tol: 28, Soft: 15, Vol: 0
    V1media_123Contact ShadowY: +40, Opacity: 0.35, Blur: 8, Brightness: 40
    V1media_456Background PlateBlur: 3, Scale: 1.0, Fit: cover
    [
  {
    "op": "addClip",
    "clip": {
      "mediaId": "media_456",
      "kind": "video",
      "track": "V1",
      "start": 0,
      "in": 0,
      "duration": 10,
      "props": { "fit": "cover", "blur": 3, "volume": 1 }
    }
  },
  {
    "op": "addClip",
    "clip": {
      "mediaId": "media_123",
      "kind": "video",
      "track": "V2",
      "start": 0,
      "in": 0,
      "duration": 10,
      "props": {
        "chromaKey": "#00ff00",
        "chromaTolerance": 28,
        "chromaSoftness": 15,
        "scale": 0.65,
        "volume": 0
      }
    }
  }
]

    Next steps

    1. Review the scale in the FableCut preview to ensure your feet align with the forest floor.
    2. If the green fringe is still visible, I can increase the chromaSoftness by 5.
    3. Click Export in the browser to render the final composite.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Key out green screens with spill suppression and feathering.Remove backgrounds from person-based footage using AI segmentation.Composite subjects onto new plates with matched lighting and scale.Generate contact shadows to ground subjects in new environments.

    About this skill

    The problem

    Manual background removal and compositing are tedious, requiring frame-by-frame masking or complex shader adjustments. AI background removal often fails on lighting and scale, leaving subjects looking like flat stickers pasted onto a plate.

    What it does

    • Executes chroma keying for green or blue screens using precise hex-code sampling and tolerance controls.
    • Triggers AI-based person segmentation for background removal without a physical screen.
    • Automates the layering logic by placing subjects on higher tracks and backgrounds on V1.
    • Calculates lighting, temperature, and scale adjustments to match the subject to the new environment.
    • Generates contact shadows by duplicating masked subjects to anchor them to the background.

    Frameworks & tools

    FableCut MCP tools, MediaPipe (for person segmentation).

    Why this beats prompting it yourself

    Basic prompts forget technical details like spill suppression, room tone removal, and Z-axis layering. This skill implements specific video editing heuristics, such as using V1 for backgrounds and applying blur to plates rather than subjects to maintain depth of field.

    Use cases

    • Swapping a webcam background for a cinematic office environment.
    • Keying out green screen studio footage for professional corporate videos.
    • Applying AI background removal for social media clips without using a physical screen.
    • Creating realistic composites with depth of field and contact shadows.

    Known limitations

    AI background removal only supports people. Generative fill for object removal is not supported. Internet access is required for the first run of the AI segmentation model.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

      Free skills download straight away. Paid skills unlock right after purchase.

    2. 2

      Unzip into your skills folder

      Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.

    3. 3

      Ask your agent to use it

      Restart the agent if it was already running. It picks the skill up automatically - no config needed.

    Skills folder by agent

    Click the path to copy it. Create the folder if it does not exist yet.

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    Fresh listing

    Recently published to Agensi

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    Trust & safety

    Security scanned

    Verified clean 13 days ago

    • Passed all security checks, Safe to install

    Listed13 days ago

    What's inside

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