Applies different macOS Finder colours to images of specific sizes

image_tag.sh

#!/usr/bin/env zsh

# Function to tag files with specified dimensions and color
tag_dimension_files() {
    local width="$1"
    local height="$2"
    local color="$3"

    # Color label mapping
    local label_index
    case "$color" in
        none)    label_index=0 ;;
        orange)  label_index=1 ;;
        red)     label_index=2 ;;
        yellow)  label_index=3 ;;
        blue)    label_index=4 ;;
        purple)  label_index=5 ;;
        green)   label_index=6 ;;
        gray)    label_index=7 ;;
        *)       echo "Invalid color. Use: none, orange, red, yellow, blue, purple, green, or gray"
                 return 1
                 ;;
    esac

    # Validate numeric inputs
    if [[ ! "$width" =~ ^[0-9]+$ || ! "$height" =~ ^[0-9]+$ ]]; then
        echo "Width and height must be numeric"
        return 1
    fi

    # Counter for tagged files
    local tagged_count=0

    # Find and tag files
    find . -type f \( -name "*.jpg" -o -name "*.png" -o -name "*.jpeg" -o -name "*.webp" \) -print0 | \
    while IFS= read -r -d '' file; do
        # Get image dimensions using sips
        dimensions=$(sips -g pixelHeight -g pixelWidth "$file" 2>/dev/null)
        file_width=$(echo "$dimensions" | awk '/pixelWidth:/{print $2}')
        file_height=$(echo "$dimensions" | awk '/pixelHeight:/{print $2}')

        # Check if dimensions match
        if [[ $file_width -eq $width && $file_height -eq $height ]]; then
            # Set color label using AppleScript
            osascript -e "tell application \"Finder\" to set label index of (POSIX file \"$file\" as alias) to $label_index" > /dev/null 2>&1
            
            echo "Tagged: $file (${width}x${height}, $color)"
            ((tagged_count++))
        fi
    done

    echo "Total files tagged: $tagged_count"
}

tag_dimension_files "160" "64" "green"
tag_dimension_files "192" "64" "yellow"
tag_dimension_files "256" "65" "blue"

#tag_dimension_files "193" "64" "red"

by Matt Sephton, March 2025, MIT