generate.sh

#!/bin/sh

set -ue

IMAGE_WIDTH=692
IMAGE_HEIGHT=692
WIDTH=28
HEIGHT=21
COUNT=$(($WIDTH * $HEIGHT))

echo "Using $COUNT random images for image ${WIDTH}x${HEIGHT}"

rm -f generated/*


for i in $(seq 1 9); do
    IMAGES=$(ls -1 *.jpg | shuf | head -n $COUNT)
    echo -n "Creating $i... "
    montage $IMAGES -tile ${WIDTH}x${HEIGHT} -geometry ${IMAGE_WIDTH}x${IMAGE_HEIGHT}+0+0 -border 10 -bordercolor black -background black miff:- | convert - -bordercolor black -border 25 generated/$i.jpg;
    echo "DONE"
done