Agent Skills: Optimize Images

Optimize Images

Optimize images in the specified directory for web delivery.

Arguments

• $ARGUMENTS - Directory path containing images to optimize (default: ./public/images)

Process

1. Find all images:

   find ${ARGUMENTS:-./public/images} -type f \( -name "*.jpg" -o -name "*.jpeg" -o -name "*.png" \)
   

2. For each image, generate:
   • WebP versions at 320w, 640w, 1280w, 1920w, 2560w
   • Thumbnail at 150x150, 300x300
   • Blur placeholder (10px width, base64)

Commands

# Install sharp-cli if not present
pnpm add -D sharp-cli

# Optimize single image example
npx sharp -i input.jpg -o output.webp --format webp --quality 80

# Generate srcset for an image
for size in 320 640 1280 1920 2560; do
  npx sharp -i input.jpg -o "output-${size}w.webp" --resize $size --format webp --quality 80
done

# Generate thumbnail
npx sharp -i input.jpg -o thumb-150.webp --resize 150 150 --fit cover --format webp

# Generate blur placeholder
npx sharp -i input.jpg -o blur.webp --resize 10 --format webp --quality 20

Output

Report:

• Number of images processed
• Original total size
• Optimized total size
• Size savings percentage