imagemagick.. magic

go.sh

#!/usr/local/bin/bash 

shopt -s globstar nullglob
in=""
out=""

process () {
    local in=$1
    local out=$2
    convert "$in" -intent relative -black-point-compensation -colorspace RGB -bordercolor white -border 5\% -thumbnail "1000000@>" -gravity center -bordercolor "rgba(64,64,64,0.3)" -border 1 \( +clone -background black -shadow 30x16-10+20 \) +swap -background "#F5F5F5" -layers merge +repage -extent 1350x1350+15+0 "$out"
}


for file in **/*.jpg; do
    [[ -f $file ]] || continue
    [[ $file = *"_P1.jpg"* ]] && continue
    out_file=${file%.jpg}_P1.jpg
    echo "Creating $out_file ..."
    process "$file" "$out_file"
done