diff --git a/generate-icns.sh b/generate-icns.sh
index 32f712e..e122137 100755
--- a/generate-icns.sh
+++ b/generate-icns.sh
@@ -4,12 +4,12 @@ abs() {
   [[ $[ $@ ] -lt 0 ]] && echo "$[ ($@) * -1 ]" || echo "$[ $@ ]"
 }
 
-DIMS=( $(identify "${1}" | cut -d\  -f3 | sed "s/x/ /g") )
-PWRS=( 16 32 128 256 512 1024 )
+DIMENSIONS=( $(identify "${1}" | cut -d\  -f3 | sed "s/x/ /g") )
+POWERS=( 16 32 64 128 )
 
-for PWR in ${PWRS[@]}; do
-  WIDEDIFS+=( $(abs "${DIMS[0]}-${PWR}")  )
-  HITEDIFS+=( $(abs "${DIMS[1]}-${PWR}")  )
+for POWER in ${POWERS[@]}; do
+  WIDEDIFS+=( $(abs "${DIMENSIONS[0]}-${POWER}")  )
+  HITEDIFS+=( $(abs "${DIMENSIONS[1]}-${POWER}")  )
 done
 
 IFS=$'\n'
@@ -17,7 +17,7 @@ WIDESORT=( $(sort -n <<<"${WIDEDIFS[*]}"))
 HITESORT=( $(sort -n <<<"${HITEDIFS[*]}"))
 unset IFS
 
-for SIZE in $((DIMS[0] - WIDESORT[0])) $((DIMS[0] + WIDESORT[0])); do
+for SIZE in $((DIMENSIONS[0] - WIDESORT[0])) $((DIMENSIONS[0] + WIDESORT[0])); do
   (( SIZE > 0 && (SIZE & (SIZE - 1)) == 0 )) && RESIZE=${SIZE}
 done