Batch image resize with convert

resize-image.sh

#!/bin/bash
# The script takes 3 args.
# -s for size (default: 1024)
# -i for input folder (default: current dir)
# -o for output folder (default: resized)
#
# For example:
# ./resize-image.sh -i pexels -o output_folder -s 1800

# Default Values
export INPUT_PATH="."
export SIZE="1024"
export OUTPUT="resized"

# Get Option
while getopts ":i:s:o:" opt; do
	case $opt in
		i) INPUT_PATH="$OPTARG"
		;;
		s) SIZE="$OPTARG"
		;;
		o) OUTPUT="$OPTARG"
		;;
		\?) echo "Invalid option -$OPTARG" >&2
		;;
	esac
done

# Create output folder if doesn't exist
if [[ ! -d $OUTPUT ]]; then mkdir $OUTPUT; fi

# Resize function
function convert_files() {
	# Get file Absolute path
	file_path=$(readlink -f $1);

	# Create file name base on path
	# For example:
	# ./folder/subfolder/file.extension -> folder-subfolder-file.extension
	file_name=$1;
	if [[ $file_name = "./"* ]]; then
		file_name=${file_name/.\//};
	fi
	file_name=${file_name//\//-};

	echo "$file_path Goes to $OUTPUT/$file_name";
    convert $file_path -resize "${SIZE}x${SIZE}^>" "$OUTPUT/$file_name";
}

export -f convert_files

printf "\nInput: %s\nSize: %s\nOutput: %s\n\n" $INPUT_PATH $SIZE $OUTPUT

# This is the real magic!
find $INPUT_PATH -type f -exec bash -c 'convert_files "$@"' bash {} \;