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diff --git a/image/wssplash.png b/image/wssplash.png
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diff --git a/image/wssplash_dev.png b/image/wssplash_dev.png
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diff --git a/packaging/macosx/dmg_background.png b/packaging/macosx/dmg_background.png
index f235fee46b..bf5a44a7d0 100644
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diff --git a/packaging/macosx/util_background.png b/packaging/macosx/util_background.png
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diff --git a/tools/compress-pngs.sh b/tools/compress-pngs.sh
index ea93f3d753..c70456e569 100755
--- a/tools/compress-pngs.sh
+++ b/tools/compress-pngs.sh
@@ -28,10 +28,32 @@ if [ -n "$1" ] ; then
     FILE_LIST_CMD="echo $1"
 fi
 
-bash -c "$FILE_LIST_CMD" | while read PNG_FILE ; do
-    echo Compressing $PNG_FILE
-    hash optipng 2>/dev/null  && optipng -o3 -quiet "$PNG_FILE"
-    hash advpng 2>/dev/null   && advpng -z -4 "$PNG_FILE"
-    hash advdef 2>/dev/null   && advdef -z -4 "$PNG_FILE"
-    hash pngcrush 2>/dev/null && pngcrush -q -ow -brute "$PNG_FILE"
-done
+# Other utilities:
+# PNGOUT (http://advsys.net/ken/utils.htm). Closed source.
+# pngquant (https://pngquant.org/). Lossy.
+
+JOBS=8
+export FILE_LIST_CMD
+(
+    echo -n "PNG_FILES ="
+    bash -c "$FILE_LIST_CMD" | while read PNG_FILE ; do
+        echo -e " \\"
+        echo -e -n "\t${PNG_FILE}"
+
+    done
+    cat <<"FIN"
+
+
+all: $(PNG_FILES)
+
+$(PNG_FILES): FORCE
+	@echo Compressing $@
+	@hash optipng 2>/dev/null  && optipng -o3 -quiet "$@"
+	@hash advpng 2>/dev/null   && advpng -z -4 "$@"
+	@hash advdef 2>/dev/null   && advdef -z -4 "$@"
+	@hash pngcrush 2>/dev/null && pngcrush -q -ow -brute -reduce -noforce "$@" pngout.$$$$.png
+
+FORCE:
+FIN
+
+) | make -j $JOBS -f -