imgae-compress（图像压缩）

TinyCompress — Smart Image Compression

<description> Use when: compressing images, optimizing image file size, reducing image size, tinypng, tinify, compress image, compress png, compress jpeg, compress webp, image optimization, shrink image, 压缩图片, 图片压缩, 图片优化, 图片瘦身, 减小图片体积 NOT for: image resizing/cropping, format conversion, image editing, video compression </description>

Overview

TinyCompress uses TinyPNG/Tinify's free web API to perform high-quality lossy compression on PNG, JPEG, and WebP images. No API key, no login, no payment required.

Key Features:

• Free — no API key or registration needed
• Supports PNG, JPEG, WebP formats
• Max 5MB per image, up to 20 images per batch
• Supports global server (tinypng.com) and China server (tinify.cn)
• Auto retry with exponential backoff on failure
• Rate-limit friendly with built-in request delays
• Typical compression: 50%~80% size reduction with near-zero visual quality loss

Prerequisites

• Python 3.6+ must be installed
• requests library: pip install requests
• Network access to tinypng.com or tinify.cn

Usage

1. Single Image Compression

When a user uploads or specifies one image:

python "{SKILL_DIR}/scripts/tiny_compress.py" compress "<image_path>"

Use China server for faster speed in China:

python "{SKILL_DIR}/scripts/tiny_compress.py" compress "<image_path>" --server cn

Output: generates <filename>_compressed.<ext> in the same directory.

2. Batch Compression

When a user provides multiple images:

python "{SKILL_DIR}/scripts/tiny_compress.py" compress "<file1>" "<file2>" ... --output-dir "<output_dir>"

3. Directory Compression

When a user specifies a directory:

python "{SKILL_DIR}/scripts/tiny_compress.py" compress-dir "<dir_path>" --output-dir "<output_dir>"

Add --recursive to include subdirectories.

4. Overwrite Mode

When user explicitly wants to replace original files:

python "{SKILL_DIR}/scripts/tiny_compress.py" compress "<file>" --overwrite

⚠️ Warning: Overwriting is irreversible. Always warn the user and suggest backup first.

Script Reference

scripts/tiny_compress.py

How it works:

• Upload endpoint: POST https://tinypng.com/backend/opt/shrink (or tinify.cn/backend/opt/shrink)
• Uploads raw image binary → server returns compression info + download URL → downloads compressed image
• Uses randomized User-Agent and X-Forwarded-For headers
• Serial processing with 1.5s delay between requests to avoid rate limiting
• Auto retry up to 3 times with exponential backoff

Output format (per image):

{
  "success": true,
  "file": "original_path",
  "output": "output_path",
  "original_size": 1234567,
  "compressed_size": 345678,
  "saved_bytes": 888889,
  "saved_percent": 72.0
}

Examples

User: "Compress this image" (uploads photo.png)
Agent: runs compress on photo.png → returns photo_compressed.png with stats

User: "Compress all images in ./screenshots"
Agent: runs compress-dir ./screenshots → returns compressed versions

User: "Use China server, compress these 3 photos"
Agent: runs compress with --server cn on all 3 files

Limitations

• Max 5MB per image (TinyPNG web limit)
• Max 20 images per batch
• This uses TinyPNG's web frontend endpoint (not official API), may change without notice
• High-frequency requests may be temporarily rate-limited
• Does not support AVIF, GIF, BMP formats
• Uploaded images are auto-deleted from TinyPNG servers after 48 hours

Important Notes

• Privacy: Images are uploaded to TinyPNG servers for processing. Do NOT upload images containing sensitive/personal information.
• Fair Use: This method simulates web browser access. Use responsibly, avoid excessive automated calls.
• Network: Requires access to tinypng.com or tinify.cn.
• Alternative: For heavy batch processing, consider registering for TinyPNG's official API key (500 free compressions/month).