add description to install imagemagick

Author: m-reuter

CONTRIBUTING.md

@@ -118,7 +118,14 @@ Optimize images to meet size requirements:
 ./scripts/optimize_images.sh all-pubs
 ```
 
-**Requirements**: ImageMagick (`brew install imagemagick`)
+**Requirements**: ImageMagick
+
+**Installation**:
+- macOS: `brew install imagemagick`
+- Ubuntu/Debian: `sudo apt-get install imagemagick`
+- Fedora/RHEL: `sudo yum install imagemagick` or `sudo dnf install imagemagick`
+- Arch Linux: `sudo pacman -S imagemagick`
+- Windows: Download from [imagemagick.org](https://imagemagick.org/script/download.php#windows) or use `choco install imagemagick`
 
 ### Pre-commit Hook
 

QUICKSTART.md

@@ -99,11 +99,16 @@ rbenv local 3.1.0
 
 ### Images too large
 ```bash
-# Optimize automatically
+# Optimize automatically (requires ImageMagick)
 ./scripts/optimize_images.sh member static/img/members/photo.jpg
 ./scripts/optimize_images.sh pub static/pub/teaser.jpg
 ```
 
+**Install ImageMagick**:
+- macOS: `brew install imagemagick`
+- Linux: `sudo apt-get install imagemagick` or `sudo yum install imagemagick`
+- Windows: [imagemagick.org](https://imagemagick.org/script/download.php#windows)
+
 ## Useful Commands
 
 ```bash

README.md

@@ -69,7 +69,10 @@ See `CONTRIBUTING.md` for detailed contribution guidelines.
 ./scripts/optimize_images.sh pub static/pub/paper_id.jpg
 ```
 
-Requires ImageMagick: `brew install imagemagick`
+**Requirements**: ImageMagick
+- macOS: `brew install imagemagick`
+- Linux: `sudo apt-get install imagemagick` or `sudo yum install imagemagick`
+- Windows: See [imagemagick.org](https://imagemagick.org/script/download.php#windows)
 
 ### Pre-commit Hook
 

scripts/optimize_images.sh

@@ -73,7 +73,29 @@ remove_backup() {
 # Check if ImageMagick is installed
 if ! command -v magick &> /dev/null && ! command -v convert &> /dev/null; then
     echo -e "${RED}Error: ImageMagick is not installed${NC}"
-    echo "Install it with: brew install imagemagick"
+    echo ""
+    echo "Please install ImageMagick for your platform:"
+    echo ""
+    echo "  macOS:"
+    echo "    brew install imagemagick"
+    echo ""
+    echo "  Ubuntu/Debian Linux:"
+    echo "    sudo apt-get update"
+    echo "    sudo apt-get install imagemagick"
+    echo ""
+    echo "  Fedora/RHEL/CentOS Linux:"
+    echo "    sudo yum install imagemagick"
+    echo "    # or on newer systems:"
+    echo "    sudo dnf install imagemagick"
+    echo ""
+    echo "  Arch Linux:"
+    echo "    sudo pacman -S imagemagick"
+    echo ""
+    echo "  Windows:"
+    echo "    Download from: https://imagemagick.org/script/download.php#windows"
+    echo "    Or use Chocolatey: choco install imagemagick"
+    echo "    Or use Scoop: scoop install imagemagick"
+    echo ""
     exit 1
 fi