image-manipulation-image-magick

✓ Official★ 36,200

by github · part of github/awesome-copilot

Image processing and manipulation using ImageMagick across Windows, Linux, and macOS. Retrieve image metadata, dimensions, and format information with the identify command Resize single or batch images with aspect ratio control and thumbnail generation Filter and process images based on dimensions or file type criteria Requires ImageMagick installed and available as magick on PATH; includes platform-specific setup for PowerShell (Windows) and Bash (Linux/macOS)

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#git

🧩 One of 7 skills in the github/awesome-copilot package — works on its own, and pairs well with its siblings.

Inspect the full instructions your agent will receiveExpand

This is the exact playbook injected into your agent when the skill activates — shown here so you can audit it before installing. You don't need to read it to use the skill.

by github

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

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

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 $magick for cleaner code
Wrap in loops - When processing multiple files, use ForEach-Object (PowerShell) or for loops (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

Copy & paste — that's it

$magick = (Get-Command magick).Source

Pattern: Get Dimensions as Variables

Copy & paste — that's it

$dimensions = & $magick identify -format "%w,%h" $_.FullName
$width,$height = $dimensions -split ','

Pattern: Conditional Processing

Copy & paste — that's it

if ([int]$width -gt 1920) {
 & $magick $_.FullName -resize 1920x1080 $outputPath
}

Pattern: Create Thumbnails

Copy & paste — that's it

& $magick $_.FullName -resize 427x240 "thumbnails/thumb_$($_.Name)"

Bash Patterns

Pattern: Check ImageMagick Installation

Copy & paste — that's it

command -v magick &> /dev/null || { echo "ImageMagick required"; exit 1; }

Pattern: Get Dimensions as Variables

Copy & paste — that's it

dimensions=$(magick identify -format "%w,%h" "$img")
width=$(echo "$dimensions" | cut -d',' -f1)
height=$(echo "$dimensions" | cut -d',' -f2)

Pattern: Conditional Processing

Copy & paste — that's it

if [[ "$width" -gt 1920 ]]; then
 magick "$img" -resize 1920x1080 "$outputPath"
fi

Pattern: Create Thumbnails

Copy & paste — that's it

filename=$(basename "$img")
magick "$img" -resize 427x240 "thumbnails/thumb_$filename"

Copy & paste — that's it

# 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

Run this in your project — your agent picks the skill up automatically.

Prerequisites

ImageMagick installed on the system
Windows: PowerShell with ImageMagick available as magick (or at C:\Program Files\ImageMagick-*\magick.exe)
Linux/macOS: Bash with ImageMagick installed via package manager (apt, brew, etc.)

Usage Examples

Example 0: Resolve `magick` executable

PowerShell (Windows):

Copy & paste — that's it

# 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):

Copy & paste — that's it

# 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):

Copy & paste — that's it

# 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):

Copy & paste — that's it

# 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):

Copy & paste — that's it

# 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):

Copy & paste — that's it

# 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):

Copy & paste — that's it

# Get verbose information about an image
& $magick identify -verbose path/to/image.jpg

Bash (Linux/macOS):

Copy & paste — that's it

# Get verbose information about an image
magick identify -verbose path/to/image.jpg

Example 4: Process Images Based on Dimensions

PowerShell (Windows):

Copy & paste — that's it

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):

Copy & paste — that's it

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

Image Manipulation with ImageMagick

When to Use This Skill

Core Capabilities

1. Image Information

2. Image Resizing

3. Batch Processing

Guidelines

Common Patterns

PowerShell Patterns

Pattern: Store ImageMagick Path

Pattern: Get Dimensions as Variables

Pattern: Conditional Processing

Pattern: Create Thumbnails

Bash Patterns

Pattern: Check ImageMagick Installation

Pattern: Get Dimensions as Variables

Pattern: Conditional Processing

Pattern: Create Thumbnails

Prerequisites

Usage Examples

Example 0: Resolve magick executable

Example 1: Get Image Dimensions

Example 2: Resize Images

Example 3: Get Detailed Image Information

Example 4: Process Images Based on Dimensions

Limitations

Example 0: Resolve `magick` executable