#!/bin/bash

n=0
c=0
imgarr=()

mkdir ./resized/
for i in ./out/*.jpg;do

  bn="$(basename ${i})"

  if [[ ${n} -eq '6' ]];then
    n=0
    c=$((c+1))
    montage ${imgarr[0]} ${imgarr[1]} ${imgarr[2]} ${imgarr[3]} ${imgarr[4]} ${imgarr[5]} -tile 3x2 -geometry +0+0 "./collages/${c}.jpg"
    imgarr=()
  fi

  echo "${n}: ${i}"

  convert -resize 400x400! "${i}" "./resized/${bn}"

  imgarr+=("./resized/${bn}")

  n=$((n+1))

done

c=$((c+1))
montage ${imgarr[0]} ${imgarr[1]} ${imgarr[2]} ${imgarr[3]} ${imgarr[4]} ${imgarr[5]} -tile 3x2 -geometry +0+0 "./collages/${c}.jpg"
rm -r ./resized/