---
tool_name: brightness-contrast
summary: Fix underexposed or washed-out photos — brightness, saturation and hue in one pass.
input:
  file: binary, required # JPG / PNG / WebP image (max 50MB)
  brightness: number, optional, min 0.1, max 3 # 亮度
  saturation: number, optional, min 0, max 3 # 饱和度
  hue: number, optional, min 0, max 360 # 色相旋转 (°)
output:
  preview_url: string | watermarked preview, free, no auth
  task_id: string | unique task identifier
  payment_url: string | end-user must complete one-time payment to unlock final output
  final_download_url: string | only available after successful payment
auth: login via email/phone OTP on https://brightness-contrast.yeezhan.com; API callers use a personal API key (Bearer yeek_...)
payment_rule: one-time charge $0.99 per task. NO credits, NO account balance. One payment unlocks only this task.
valid_window: 24 hours after payment
errors:
  - file_too_large
  - invalid_input
  - unsupported_type
  - target_unreachable
  - processing_failed
endpoint: https://brightness-contrast.yeezhan.com/api/v1/run
---