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diff --git a/mods/xpanes/textures/xpanes_trapdoor_steel_bar.png b/mods/xpanes/textures/xpanes_trapdoor_steel_bar.png
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diff --git a/utils/optimize_textures.sh b/utils/optimize_textures.sh
new file mode 100644
index 000000000..2f9a6da57
--- /dev/null
+++ b/utils/optimize_textures.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Colors with 0 alpha need to be preserved, because opaque leaves ignore alpha.
+# For that purpose, the use of indexed colors is disabled (-nc).
+
+find -name '../*.png' -print0 | xargs -0 optipng -o7 -zm1-9 -nc -strip all -clobber