diff --git a/Utilities/Python/scripts/make_smv_images.py b/Utilities/Python/scripts/make_smv_images.py
index 34aa04e32d..0306408ecb 100644
--- a/Utilities/Python/scripts/make_smv_images.py
+++ b/Utilities/Python/scripts/make_smv_images.py
@@ -14,26 +14,30 @@
 from PIL import Image
 import numpy as np
 
-def compare_images(image1_path, image2_path):
-
-    img1 = Image.open(image1_path).convert('RGB')
-    img2 = Image.open(image2_path).convert('RGB')
+def compare_images(image1_path, image2_path, threshold=10):
+    img1 = Image.open(image1_path).convert("RGB")
+    img2 = Image.open(image2_path).convert("RGB")
 
     if img1.size != img2.size:
-        print(f"Warning: Images have different sizes. Resizing {image2_path} to match {image1_path}")
-        img2 = img2.resize(img1.size, Image.LANCZOS)
+        raise ValueError("Images must have the same dimensions")
 
-    arr1 = np.array(img1, dtype=np.float64)
-    arr2 = np.array(img2, dtype=np.float64)
+    arr1 = np.array(img1, dtype=np.int16)
+    arr2 = np.array(img2, dtype=np.int16)
 
-    # Calculate Mean Squared Error (MSE)
-    mse = np.mean((arr1 - arr2) ** 2)
+    diff = np.abs(arr1 - arr2)
+    pixel_diff = np.max(diff, axis=2)
+
+    changed_pixels = np.sum(pixel_diff > threshold)
+    total_pixels = pixel_diff.size
 
-    # Calculate normalized similarity percentage (0-100%)
-    max_mse = 255.0 ** 2
-    similarity_percentage = (1 - (mse / max_mse)) * 100
+    difference_percentage = (changed_pixels / total_pixels) * 100
+
+    mse = np.mean((arr1 - arr2) ** 2)
 
-    return { 'mse': mse, 'similarity_percentage': similarity_percentage }
+    return {
+        "mse": mse,
+        "difference_percentage": difference_percentage
+    }
 
 
 parser = argparse.ArgumentParser(description="A script to generate Smokeview images")
@@ -72,9 +76,9 @@ def compare_images(image1_path, image2_path):
     try:
         if os_name == "Linux":
             subprocess.run(['xvfb-run','-w','2','-s','-fp /usr/share/X11/fonts/misc -screen 0 1280x1024x24','-a',smokeview_path,
-                    '-bindir',bindir,'-runscript', case[i] ], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                    '-bindir',bindir,'-runscript', '-render_overwrite', case[i] ], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
         else:
-            subprocess.run([smokeview_path,'-bindir',bindir,'-runscript',case[i]], 
+            subprocess.run([smokeview_path,'-bindir',bindir,'-runscript','-render_overwrite', case[i]], 
                            check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
     except subprocess.CalledProcessError as e:
         print(f"Error: Smokeview failed with return code {e.returncode}")
@@ -100,8 +104,8 @@ def compare_images(image1_path, image2_path):
 
         try:
             results = compare_images(directory+png_file.name, refdir+png_file.name)
-            if results['similarity_percentage'] < 98:
-                print('Warning: ',png_file.name,f"{results['similarity_percentage']:.2f}%")
+            if results['difference_percentage'] > 1:
+                print('Warning: ',png_file.name,' changed ',f"{results['difference_percentage']:.2f}%")
         except FileNotFoundError as e:
             print(f"Error: Could not find image file - {e}")
             sys.exit(1)