diff --git a/lib/canvas/generate-image.ts b/lib/canvas/generate-image.ts
index 981dd721a..e29df494e 100644
--- a/lib/canvas/generate-image.ts
+++ b/lib/canvas/generate-image.ts
@@ -206,6 +206,8 @@ const SCALE_ADJUST_RECTANGULAR_SEAM_PAIR_RUN_RATIO = 0.11;
 const SCALE_ADJUST_RECTANGULAR_SEAM_PAIR_TRANSITION_RATIO = 0.18;
 const SCALE_ADJUST_RECTANGULAR_SEAM_STRONG_RUN_RATIO = 0.1;
 const SCALE_ADJUST_RECTANGULAR_SEAM_STRONG_TRANSITION_RATIO = 0.26;
+const SCALE_ADJUST_RECTANGULAR_SEAM_VERY_STRONG_RUN_RATIO = 0.55;
+const SCALE_ADJUST_RECTANGULAR_SEAM_VERY_STRONG_TRANSITION_RATIO = 0.5;
 
 const SUPPORTED_CANVAS_PROVIDER_TYPES = new Set([
   "gemini",
@@ -1147,9 +1149,26 @@ async function getScaleAdjustRectangularSeamStats(params: {
       SCALE_ADJUST_RECTANGULAR_SEAM_STRONG_RUN_RATIO &&
     bestHorizontal.transitionRatio >=
       SCALE_ADJUST_RECTANGULAR_SEAM_STRONG_TRANSITION_RATIO;
+  const verticalVeryStrong =
+    bestVertical &&
+    bestVertical.maxRunRatio >=
+      SCALE_ADJUST_RECTANGULAR_SEAM_VERY_STRONG_RUN_RATIO &&
+    bestVertical.transitionRatio >=
+      SCALE_ADJUST_RECTANGULAR_SEAM_VERY_STRONG_TRANSITION_RATIO;
+  const horizontalVeryStrong =
+    bestHorizontal &&
+    bestHorizontal.maxRunRatio >=
+      SCALE_ADJUST_RECTANGULAR_SEAM_VERY_STRONG_RUN_RATIO &&
+    bestHorizontal.transitionRatio >=
+      SCALE_ADJUST_RECTANGULAR_SEAM_VERY_STRONG_TRANSITION_RATIO;
 
   return {
-    detected: Boolean((verticalPair && horizontalPair) || verticalStrong || horizontalStrong),
+    detected: Boolean(
+      (verticalPair && horizontalPair) ||
+        (verticalStrong && horizontalStrong) ||
+        verticalVeryStrong ||
+        horizontalVeryStrong
+    ),
     horizontal: bestHorizontal,
     lineStep,
     protectedBoxCount: protectedBoxes.length,