diff --git a/pixel_mask_analysis.py b/pixel_mask_analysis.py
index b263e55..0049ce1 100755
--- a/pixel_mask_analysis.py
+++ b/pixel_mask_analysis.py
@@ -89,7 +89,7 @@ plot(mask, "mask")
 
 reasons = make_reasons()
 for val in values:
-    selected = (image & val) == 0
+    selected = (image & val) != 0
     reason = reasons[val]
     plot(selected, f"{val} | {val:b} | {reason}")