A bash script to watermark all the photos in a folder. ImageMagick is required.

watermarker.sh

#!/bin/bash

SRC_DIR="${1}"
MARK="${2}"

if [[ "$#" -lt "2" ]] ; then
  	echo "A small script for adding watermark to images."
 	echo "Usage: $0 INPUT_IMAGE_FOLDER WATER_MARK_FILE"
 	exit 1
fi

OUT_DIR="${1}.marked"
mkdir -p "${OUT_DIR}"

# MARK_SIZE=$(identify ${MARK} | cut -d " " -f3)
# MARK_WIDTH=$(echo ${MARK_SIZE} | cut -d "x" -f1)
# MARK_HEIGHT=$(echo ${MARK_SIZE} | cut -d "x" -f2)

find "${SRC_DIR}" -type f -print0 | while IFS= read -r -d '' IMG; do
    FULLNAME=`basename "${IMG}"`
    FNAME="${FULLNAME%.*}"
	# EXT="${FULLNAME##*.}"
	echo "Processing $FNAME"
    # read line </dev/tty # waite for enter
    convert "${IMG}" -auto-orient       \
        "${MARK}" -gravity SouthEast    \
        -composite "${OUT_DIR}/${FULLNAME}"
done

echo "Finished"
echo "Opening output folder"
open "${OUT_DIR}"

exit 0