image-manipulation-image-magick
Process and manipulate images using ImageMagick. Supports resizing, format conversion, batch processing, and retrieving image metadata. Use when working with images, creating thumbnails, resizing wallpapers, or performing batch image operations.
Installation
Details
Usage
After installing, this skill will be available to your AI coding assistant.
Verify installation:
npx agent-skills-cli listSkill Instructions
name: image-manipulation-image-magick
description: Process and manipulate images using ImageMagick. Supports resizing, format conversion, batch processing, and retrieving image metadata. Use when working with images, creating thumbnails, resizing wallpapers, or performing batch image operations.
compatibility: Requires ImageMagick installed and available as magick on PATH. Cross-platform examples provided for PowerShell (Windows) and Bash (Linux/macOS).
Image Manipulation with ImageMagick
This skill enables image processing and manipulation tasks using ImageMagick across Windows, Linux, and macOS systems.
When to Use This Skill
Use this skill when you need to:
- Resize images (single or batch)
- Get image dimensions and metadata
- Convert between image formats
- Create thumbnails
- Process wallpapers for different screen sizes
- Batch process multiple images with specific criteria
Prerequisites
- ImageMagick installed on the system
- Windows: PowerShell with ImageMagick available as
magick(or atC:\Program Files\ImageMagick-*\magick.exe) - Linux/macOS: Bash with ImageMagick installed via package manager (
apt,brew, etc.)
Core Capabilities
1. Image Information
- Get image dimensions (width x height)
- Retrieve detailed metadata (format, color space, etc.)
- Identify image format
2. Image Resizing
- Resize single images
- Batch resize multiple images
- Create thumbnails with specific dimensions
- Maintain aspect ratios
3. Batch Processing
- Process images based on dimensions
- Filter and process specific file types
- Apply transformations to multiple files
Usage Examples
Example 0: Resolve magick executable
PowerShell (Windows):
# Prefer ImageMagick on PATH
$magick = (Get-Command magick -ErrorAction SilentlyContinue)?.Source
# Fallback: common install pattern under Program Files
if (-not $magick) {
$magick = Get-ChildItem "C:\\Program Files\\ImageMagick-*\\magick.exe" -ErrorAction SilentlyContinue |
Select-Object -First 1 -ExpandProperty FullName
}
if (-not $magick) {
throw "ImageMagick not found. Install it and/or add 'magick' to PATH."
}
Bash (Linux/macOS):
# Check if magick is available on PATH
if ! command -v magick &> /dev/null; then
echo "ImageMagick not found. Install it using your package manager:"
echo " Ubuntu/Debian: sudo apt install imagemagick"
echo " macOS: brew install imagemagick"
exit 1
fi
Example 1: Get Image Dimensions
PowerShell (Windows):
# For a single image
& $magick identify -format "%wx%h" path/to/image.jpg
# For multiple images
Get-ChildItem "path/to/images/*" | ForEach-Object {
$dimensions = & $magick identify -format "%f: %wx%h`n" $_.FullName
Write-Host $dimensions
}
Bash (Linux/macOS):
# For a single image
magick identify -format "%wx%h" path/to/image.jpg
# For multiple images
for img in path/to/images/*; do
magick identify -format "%f: %wx%h\n" "$img"
done
Example 2: Resize Images
PowerShell (Windows):
# Resize a single image
& $magick input.jpg -resize 427x240 output.jpg
# Batch resize images
Get-ChildItem "path/to/images/*" | ForEach-Object {
& $magick $_.FullName -resize 427x240 "path/to/output/thumb_$($_.Name)"
}
Bash (Linux/macOS):
# Resize a single image
magick input.jpg -resize 427x240 output.jpg
# Batch resize images
for img in path/to/images/*; do
filename=$(basename "$img")
magick "$img" -resize 427x240 "path/to/output/thumb_$filename"
done
Example 3: Get Detailed Image Information
PowerShell (Windows):
# Get verbose information about an image
& $magick identify -verbose path/to/image.jpg
Bash (Linux/macOS):
# Get verbose information about an image
magick identify -verbose path/to/image.jpg
Example 4: Process Images Based on Dimensions
PowerShell (Windows):
Get-ChildItem "path/to/images/*" | ForEach-Object {
$dimensions = & $magick identify -format "%w,%h" $_.FullName
if ($dimensions) {
$width,$height = $dimensions -split ','
if ([int]$width -eq 2560 -or [int]$height -eq 1440) {
Write-Host "Processing $($_.Name)"
& $magick $_.FullName -resize 427x240 "path/to/output/thumb_$($_.Name)"
}
}
}
Bash (Linux/macOS):
for img in path/to/images/*; do
dimensions=$(magick identify -format "%w,%h" "$img")
if [[ -n "$dimensions" ]]; then
width=$(echo "$dimensions" | cut -d',' -f1)
height=$(echo "$dimensions" | cut -d',' -f2)
if [[ "$width" -eq 2560 || "$height" -eq 1440 ]]; then
filename=$(basename "$img")
echo "Processing $filename"
magick "$img" -resize 427x240 "path/to/output/thumb_$filename"
fi
fi
done
Guidelines
- Always quote file paths - Use quotes around file paths that might contain spaces
- Use the
&operator (PowerShell) - Invoke the magick executable using&in PowerShell - Store the path in a variable (PowerShell) - Assign the ImageMagick path to
$magickfor cleaner code - Wrap in loops - When processing multiple files, use
ForEach-Object(PowerShell) orforloops (Bash) - Verify dimensions first - Check image dimensions before processing to avoid unnecessary operations
- Use appropriate resize flags - Consider using
!to force exact dimensions or^for minimum dimensions
Common Patterns
PowerShell Patterns
Pattern: Store ImageMagick Path
$magick = (Get-Command magick).Source
Pattern: Get Dimensions as Variables
$dimensions = & $magick identify -format "%w,%h" $_.FullName
$width,$height = $dimensions -split ','
Pattern: Conditional Processing
if ([int]$width -gt 1920) {
& $magick $_.FullName -resize 1920x1080 $outputPath
}
Pattern: Create Thumbnails
& $magick $_.FullName -resize 427x240 "thumbnails/thumb_$($_.Name)"
Bash Patterns
Pattern: Check ImageMagick Installation
command -v magick &> /dev/null || { echo "ImageMagick required"; exit 1; }
Pattern: Get Dimensions as Variables
dimensions=$(magick identify -format "%w,%h" "$img")
width=$(echo "$dimensions" | cut -d',' -f1)
height=$(echo "$dimensions" | cut -d',' -f2)
Pattern: Conditional Processing
if [[ "$width" -gt 1920 ]]; then
magick "$img" -resize 1920x1080 "$outputPath"
fi
Pattern: Create Thumbnails
filename=$(basename "$img")
magick "$img" -resize 427x240 "thumbnails/thumb_$filename"
Limitations
- Large batch operations may be memory-intensive
- Some complex operations may require additional ImageMagick delegates
- On older Linux systems, use
convertinstead ofmagick(ImageMagick 6.x vs 7.x)
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