diff --git a/src/stitching_scanner.py b/src/stitching_scanner.py
index 0a4d78c..d5866e3 100644
--- a/src/stitching_scanner.py
+++ b/src/stitching_scanner.py
@@ -264,8 +264,8 @@ class StitchingScanner:
             # Transition strips are at Y=0 to Y=transition_height
             # So transition bottom is around Y=(transition_height - overlap) to Y=transition_height
             
-            transition_compare_y_end = transition_height
-            transition_compare_y_start = max(0, transition_height - vertical_overlap)
+            transition_compare_y_start = transition_height
+            transition_compare_y_end = max(0, transition_height + vertical_overlap)
             
             # Frame's TOP should overlap with transition BOTTOM
             frame_top = frame[:vertical_overlap, :]