Find images susceptible of being used as wallpaper

wallpapers.sh

#!/bin/bash
min_ratio=$(bc -l <<< 4/3)
max_ratio=$(bc -l <<< 20/9)
min_height=720
images=()
for f in *.png *.jpg; do
  read ratio height <<<$(identify -format '%[fx:w/h] %[fx:h]' "$f")

  if (( $(bc <<< "$ratio >= $min_ratio && $ratio <= $max_ratio \
    && $height >= $min_height") == 1)); then
    echo "$f"
    images+=("$f")
  fi
done
feh --geometry 1366x768 --image-bg black "${images[@]}"