diff --git a/images/Makefile b/images/Makefile
new file mode 100644
index 0000000..7cd0295
--- /dev/null
+++ b/images/Makefile
@@ -0,0 +1,9 @@
+
+SPRITE_PCENT=15
+
+resize:
+	-mkdir $(SPRITE_PCENT)p
+	for i in fullsize/*; do \
+		convert -resize $(SPRITE_PCENT)% $$i $${i/fullsize/$(SPRITE_PCENT)p}; \
+	done
+