watermark.sh

#!/bin/bash

# takes a directory as the first argument and loops through all of the jpg
# images watermarking them into a watermark folder within that directory.
DIRECTORY=$1
WATERMARK=$2

mkdir -p $1/watermark
for filename in $DIRECTORY/*
do
    if [[ ! -d $filename ]]; then
        BASE=$(basename "$filename" .jpg)
        EXT="${filename##*.}"
        if [ "$EXT" = "jpg" ]; then
            OUTPUT="$1/watermark/$BASE.$EXT"
            echo "$filename --> $OUTPUT"
            ww=`convert $filename -format "%[fx:.20*w]" info:`
            hh=`convert $filename -format "%[fx:.20*h]" info:`
            isPortait=`echo $hh'>'$ww | bc -l`
            if [ $isPortait -eq 1 ]; then
                ww=`convert $filename -format "%[fx:.30*w]" info:`
                hh=`convert $filename -format "%[fx:.30*h]" info:`
            fi

            composite -gravity SouthWest -geometry +50+50 \( $WATERMARK -resize ${ww}x${hh} \) $filename $OUTPUT
        fi
    fi
done