image-manipulation-image-magick

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 at C:\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 $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 $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 convert instead of magick (ImageMagick 6.x vs 7.x)