image-compress
Compress images to reduce file size while preserving quality. Use when images are slowing down builds, uploads, or page loads.
What this skill does
# Image Compression
Compress images to reduce file size with minimal quality loss.
## Supported Formats
- PNG, JPEG, GIF, WebP, AVIF
## Tools
### Command Line
```bash
# Using sharp (Node.js)
npx sharp-cli input.png --resize 800 output.png
# Using magick (ImageMagick)
magick input.jpg -quality 85 -resize 1200 output.jpg
# Using cwebp (WebP)
cwebp -q 80 input.png -o output.webp
# Using avifenc (AVIF)
avifenc input.png -o output.avif
```
### Python
```bash
# Using Pillow
python3 -c "from PIL import Image; i=Image.open('input.png'); i.save('output.jpg', quality=85, optimize=True)"
```
## Common Patterns
### Compress Single Image
```bash
# Reduce to max 1200px width, 85% quality
magick input.png -resize 1200x1200/> -quality 85 output.jpg
```
### Batch Compress
```bash
# All PNGs in directory
for f in *.png; do magick "$f" -quality 85 -resize 1200x1200\> "${f%.png}-compressed.jpg"; done
```
### Convert to WebP
```bash
# WebP with good compression
cwebp -q 80 -resize 1200 0 input.png -o output.webp
```
## Quality Guidelines
| Use Case | Quality | Format |
| -------------------------- | -------- | --------- |
| High quality (screenshots) | 90% | PNG/WebP |
| Photos | 85% | JPEG/WebP |
| Thumbnails | 70% | WebP/AVIF |
| Icons/Logos | Lossless | PNG/WebP |
## Batch Processing
### Find Large Images
```bash
find . -type f \( -iname "*.png" -o -iname "*.jpg" -o -iname "*.jpeg" \) -size +100k -exec ls -lh {} \;
```
### Target Sizes
- Icons: < 10KB
- Thumbnails: < 50KB
- Full images: < 500KB
- Screenshots: < 1MB
## Notes/Inspiration
Inspired by [`opencode-image-compress`](https://www.npmjs.com/package/opencode-image-compress) - Image compression for OpenCode.
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