Shrink PNGs, fix sieve animation bug

iron_age/gravelsieve.lua

@@ -128,11 +128,11 @@ for idx = 0,3 do
 
 	minetest.register_node("techage:sieve"..idx, {
 		description =  S("TA1 Gravel Sieve"),
-		tiles = tiles_data,
+		tiles = table.copy(tiles_data),
 		drawtype = "nodebox",
 		node_box = {
 			type = "fixed",
-			fixed = nodebox_data,
+			fixed = table.copy(nodebox_data),
 		},
 		selection_box = {
 			type = "fixed",

textures/shrink.py

@@ -1,13 +1,13 @@
 import os, fnmatch
 
 
-print ">>> Convert"
+print(">>> Convert")
 for filename in os.listdir("./"):
     if fnmatch.fnmatch(filename, "*.png"):
         print(filename)
-        os.system("pngquant --skip-if-larger --quality=8-32 --output ./%s.new  ./%s" % (filename, filename))
+        os.system("pngquant --skip-if-larger --quality=20-40 --strip --output ./%s.new  ./%s" % (filename, filename))
 
-print "\n>>> Copy"
+print("\n>>> Copy")
 for filename in os.listdir("./"):
     if fnmatch.fnmatch(filename, "*.new"):
         print(filename)