diff --git a/script/imgtest.py b/script/imgtest.py
index 922d727..436c389 100644
--- a/script/imgtest.py
+++ b/script/imgtest.py
@@ -30,12 +30,12 @@ class MyFilter(Filter):
         for i in range(256):
             r.append(0)
             g.append(0)
-            b.append(i)        
+            b.append(255-i)        
         set_lut(output_puck, r, g, b)
 
         
-        #op_image(ip, output_puck, "or")
-        ip=output_puck
+        op_image(ip, output_puck, "or")
+        #ip=output_puck
         #invert(output_puck)        
         #invert(output_samples)         
         #op_const(output_puck, "multiply", 0.5)