# Chroma Key (Green Screen) — yeezhan.com
> One-time pay-per-task emergency tool to make your file ready for submission.
> No credits, no balance. One payment unlocks one task result, valid for 24 hours.

Tool domain: https://chroma-key.yeezhan.com
Skill definition: https://chroma-key.yeezhan.com/skill/SKILL.md
API documentation: https://chroma-key.yeezhan.com/api/docs

## What this tool does
Knock out a green or blue screen by colour distance — with feathered edges and spill suppression, output transparent PNG.

## Typical user problems
- Green-screen shots need the backdrop gone before compositing. Colour-distance keying with a feather band keeps hair and soft edges natural, and spill suppression pulls the green fringe back to neutral.

## Parameters
- key_color: enum, required. 抠像底色
- tolerance: number (range 5-100), required. 容差

## Pricing
- Watermarked preview: free, no login required
- Final clean output: $0.99 one-time per task
- Require login (email/phone OTP) to complete payment
- Result available for download 24 hours after payment

## Limitations
- Max input 50 MB