diff --git a/src/stitching_scanner.py b/src/stitching_scanner.py
index d5866e3..e3fef1a 100644
--- a/src/stitching_scanner.py
+++ b/src/stitching_scanner.py
@@ -271,8 +271,8 @@ class StitchingScanner:
             frame_top = frame[:vertical_overlap, :]
             
             # Get the X range - centered on where transition strips are
-            x_start = x_offset
-            x_end = min(x_offset + fw, mw)
+            x_end = x_offset
+            x_start = min(x_offset - fw, mw)
             compare_width = x_end - x_start
             
             if transition_compare_y_start >= 0 and compare_width >= min_overlap: