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+#!/bin/sh
+
+# Copyright 2017 jstpcs <jstpcs at protonmail dot com>
+# Copyright 2017 moviuro <moviuro at gmail dot com>
+
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -e
+
+usage() {
+  cat << EOH
+Generate wallpapers to a specified size, given a base picture
+
+$0 [-vs] width height [picture [picture [...]]]
+$0 -h
+
+-h : displays this help message
+-s : use a "safer" and slower method to get the background color
+-v : be verbose (set -x)
+
+Example: $0 1920 1080 coolimage.png
+
+The following syntax also works:
+find . -type f -name '*.png' | $0 1080 1920
+EOH
+  exit ${1:-0}
+}
+
+die() {
+  echo "$1" && exit "${2:-1}"
+}
+
+while getopts ":hvs" _opt; do
+  case "$_opt" in
+    h) usage       ;;
+    s) _slow=1     ;;
+    v) set -x      ;;
+    *) usage 1 >&2 ;;
+  esac
+done
+
+shift $((OPTIND-1))
+
+if [ -n "$_slow" ]; then
+  getbg() {
+    # We get all hexa codes of all pixels in the picture, and pick the most
+    # frequent one... which should be the background color?
+    convert "$1" -format %c +dither -depth 5  histogram:info: |
+      sort -nr | head -1 | grep -Eo '#[A-F0-9]{6}'
+  }
+else
+  getbg() {
+    # We get the color of the top-left pixel.
+    convert "$1" -crop 1x1+0+0 -depth 8 txt: | grep -Eo '#[A-F0-9]{6}'
+  }
+fi
+
+# We require width & height
+# TODO: maybe auto-detect? seems tricky with dual screen
+if [ $# -lt 2 ]; then
+  usage 1 >&2
+fi
+width="$1"
+height="$2"
+shift 2
+
+{ if [ -z "$1" ]; then
+  # No arguments, we read stdin
+  cat -
+else
+  for _file in "$@"; do
+    printf '%s\n' "$_file"
+  done
+fi } |
+while IFS= read -r inpfile; do
+  outfile="$(basename "$inpfile")"
+  bgcolor="$(getbg "$inpfile")"
+
+  # We use the `-resize ..x..\>` syntax to only shrink pictures. Enlarging is
+  # asking for trouble (artifacting, etc.)
+  convert "$inpfile" -gravity center -resize "${width}x${height}>" \
+    -background "$bgcolor" -extent "${width}x${height}" \
+    "${outfile%.*}-${width}x${height}.${outfile##*.}"
+done