菜单
Convert and manipulate images with ImageMagick. Covers format conversion, resizing, batch processing, quality adjustment, and image transformations. Use when user mentions image conversion, resizing images, ImageMagick, magick command, batch image processing, or thumbnail generation.
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
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| created | "2025-12-16T00:00:00.000Z" |
| modified | "2025-12-16T00:00:00.000Z" |
| reviewed | "2025-12-16T00:00:00.000Z" |
| name | imagemagick-conversion |
| description | Convert and manipulate images with ImageMagick. Covers format conversion, resizing, batch processing, quality adjustment, and image transformations. Use when user mentions image conversion, resizing images, ImageMagick, magick command, batch image processing, or thumbnail generation. |
Project: Project-independent Gitignored: Yes
Use this skill when users request image manipulation tasks including:
ImageMagick is a powerful command-line tool for image processing. This skill provides guidance for using the magick command to perform common image conversion and manipulation tasks.
Key Command Pattern:
magick input-file [options] output-file
Basic format conversion:
magick image.jpg image.png
magick photo.png photo.webp
Batch convert all JPEGs to PNG:
magick mogrify -format png *.jpg
Convert with specific output directory:
mkdir -p output
magick mogrify -format webp -path output/ *.jpg
Resize by percentage:
magick image.jpg -resize 50% output.jpg
Resize to specific width (maintain aspect ratio):
magick image.jpg -resize 800x output.jpg
Resize to specific height (maintain aspect ratio):
magick image.jpg -resize x600 output.jpg
Resize to fit within dimensions (maintain aspect ratio):
magick image.jpg -resize 800x600 output.jpg
Resize to exact dimensions (ignore aspect ratio):
magick image.jpg -resize 800x600! output.jpg
Resize only if larger:
magick image.jpg -resize '800x600>' output.jpg
Resize only if smaller:
magick image.jpg -resize '800x600<' output.jpg
Set JPEG quality (1-100, default 92):
magick image.jpg -quality 85 output.jpg
Optimize PNG compression:
magick image.png -quality 95 output.png
Create high-quality WebP:
magick image.jpg -quality 90 output.webp
Generate thumbnail (fast, lower quality):
magick image.jpg -thumbnail 200x200 thumb.jpg
Generate thumbnail with padding:
magick image.jpg -thumbnail 200x200 -background white -gravity center -extent 200x200 thumb.jpg
Resize all images in directory:
magick mogrify -resize 800x600 -path resized/ *.jpg
Convert and resize in one operation:
magick mogrify -resize 1200x -format webp -quality 85 -path output/ *.jpg
Process specific file types:
magick mogrify -resize 50% -path smaller/ *.{jpg,png,gif}
Display image information:
magick identify image.jpg
Detailed image information:
magick identify -verbose image.jpg
Rotate image:
magick image.jpg -rotate 90 rotated.jpg
Flip horizontally:
magick image.jpg -flop flipped.jpg
Flip vertically:
magick image.jpg -flip flipped.jpg
Crop to specific region:
magick image.jpg -crop 800x600+100+100 cropped.jpg
Auto-orient based on EXIF:
magick image.jpg -auto-orient output.jpg
Strip metadata (reduce file size):
magick image.jpg -strip output.jpg
magick mogrify: Modifies files in-place or writes to specified path
-path option to preserve originalsmagick convert (or just magick): Creates new files
-thumbnail for thumbnails: Faster than -resize for small previews-strip to remove metadata: Reduces file size significantlymogrify commandAlways test commands on copies first:
# Create test directory
mkdir -p test-output
# Test on single file
magick original.jpg -resize 50% test-output/test.jpg
# Verify result before batch processing
Use -path with mogrify to preserve originals:
# This preserves originals in current directory
magick mogrify -resize 800x -path resized/ *.jpg
Quote wildcards in shell:
# Prevents premature shell expansion
magick mogrify -resize '800x600>' -path output/ '*.jpg'
# Create optimized versions for web
mkdir -p web-optimized
# Convert to WebP with quality 85, resize to max 1920px width
magick mogrify -resize 1920x -quality 85 -format webp -path web-optimized/ *.jpg
# Strip metadata to reduce size
magick mogrify -strip web-optimized/*.webp
# Create thumbnail directory
mkdir -p thumbnails
# Generate 300x300 thumbnails with white padding
for img in *.jpg; do
magick "$img" -thumbnail 300x300 -background white -gravity center -extent 300x300 "thumbnails/${img%.jpg}_thumb.jpg"
done
# Export to multiple formats for compatibility
mkdir -p exports/{png,webp,jpg}
for img in source/*.png; do
name=$(basename "$img" .png)
magick "$img" -quality 90 "exports/png/$name.png"
magick "$img" -quality 85 "exports/webp/$name.webp"
magick "$img" -quality 85 "exports/jpg/$name.jpg"
done
Check ImageMagick version:
magick -version
Verify supported formats:
magick identify -list format
Test command on single file first:
# Always test before batch operations
magick test-image.jpg -resize 50% test-output.jpg
✓ Use this skill for:
✗ Don't use this skill for:
This skill complements other development workflows:
The magick command is typically available via Homebrew (brew install imagemagick) or system package managers.