diff --git a/generate-icns.sh b/generate-icns.sh
new file mode 100755
index 0000000..5f5d262
--- /dev/null
+++ b/generate-icns.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+abs() {
+  [[ $[ $@ ] -lt 0 ]] && echo "$[ ($@) * -1 ]" || echo "$[ $@ ]"
+}
+
+DIMS=( $(identify "${1}" | cut -d\  -f3 | sed "s/x/ /g") )
+PWRS=( 16 32 128 256 512 1024 )
+
+for PWR in ${PWRS[@]}; do
+  WIDEDIFS+=( $(abs "${DIMS[0]}-${PWR}")  )
+  HITEDIFS+=( $(abs "${DIMS[1]}-${PWR}")  )
+done
+
+IFS=$'\n'
+WIDESORT=( $(sort -n <<<"${WIDEDIFS[*]}"))
+HITESORT=( $(sort -n <<<"${HITEDIFS[*]}"))
+unset IFS
+
+for SIZE in $((DIMS[0] - WIDESORT[0])) $((DIMS[0] + WIDESORT[0])); do
+  (( SIZE > 0 && (SIZE & (SIZE - 1)) == 0 )) && RESIZE=${SIZE}
+done
+
+set -x
+convert "${1}" -resize ${RESIZE}x${RESIZE} /tmp/tmp.png
+png2icns ${1/%png/icns} /tmp/tmp.png
+rm /tmp/tmp.png