# Hue & Saturation — 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://hue-saturation.yeezhan.com
Skill definition: https://hue-saturation.yeezhan.com/skill/SKILL.md
API documentation: https://hue-saturation.yeezhan.com/api/docs

## What this tool does
Rotate hue, boost or mute saturation, lift or drop lightness — quick colour grading without a editor.

## Typical user problems
- Product shots arrive slightly off-brand, footage turns orange under tungsten light, or a design just needs a different colourway — hue rotation and saturation control fix all three without reinstalling an editor.

## Parameters
- hue: number (range -360-360°), required. 色相旋转
- saturation: number (range 0-2), required. 饱和度
- lightness: number (range -100-100%), optional. 亮度. 映射为亮度系数 1 + lightness/100

## 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