# Image Sharpen (USM) — 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://sharpen.yeezhan.com
Skill definition: https://sharpen.yeezhan.com/skill/SKILL.md
API documentation: https://sharpen.yeezhan.com/api/docs

## What this tool does
Unsharp-mask sharpening with full control over amount, radius and threshold — rescue soft or upscaled photos.

## Typical user problems
- Screens downscale, social platforms recompress, AI upscalers hallucinate — the result is always a soft image. Unsharp masking restores crisp edges, with amount / radius / threshold tuned to your photo.

## Parameters
- amount: number (range 0.5-3), required. 锐化强度
- radius: number (range 0.5-10px), required. 锐化半径
- threshold: number (range 0-255), required. 阈值

## 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