Make transaprent and crop an image

convert.sh

#!/bin/bash

# Display help with -h parameter
function display_help {
    echo "Usage: $0 -i <image-path>"
    echo
    echo "  -h              Display this help message."
    echo "  -i <image-path> Specify the image path for processing."
    echo
    exit 1
}

# No arguments, print help
if [ $# -eq 0 ]; then
    display_help
fi

# Parse arguments
while getopts "hi:" opt; do
    case $opt in
        h)
            display_help
            ;;
        i)
            image_path="$OPTARG"
            ;;
        \?)
            echo "Invalid option: -$OPTARG" >&2
            display_help
            ;;
    esac
done

# Check if image file is provided and exists
if [ -z "$image_path" ]; then
    echo "Error: No image path provided."
    exit 1
fi

if [ ! -f "$image_path" ]; then
    echo "Error: File does not exist."
    exit 1
fi

# Test ImageMagick before execution
if ! convert --version &> /dev/null; then
    echo "Error: ImageMagick is not installed or not in PATH."
    exit 1
fi

# Create a temporary directory
temp_dir=$(mktemp -d)
trap 'rm -rf -- "$temp_dir"' EXIT

# Remove background from image
bg_removed_image="$temp_dir/bg_removed.png"
convert "$image_path" -background none -flatten "$bg_removed_image"

# Convert white pixels to transparent
transparent_image="$temp_dir/transparent.png"
convert "$bg_removed_image" -transparent white "$transparent_image"

# Crop image size to content
cropped_image="$temp_dir/cropped.png"
convert "$transparent_image" -trim "$cropped_image"

# Prepare the new image path with -new suffix
filename=$(basename -- "$image_path")
extension="${filename##*.}"
filename="${filename%.*}"
new_image_path="$(dirname -- "$image_path")/${filename}-new.$extension"

# Move the final image to the same folder as the source image
mv "$cropped_image" "$new_image_path"

echo "Processing complete. Output image located at $new_image_path"