diff --git a/scripts/tests.py b/scripts/tests.py
index 63d34bd..fed4c20 100644
--- a/scripts/tests.py
+++ b/scripts/tests.py
@@ -35,6 +35,8 @@ from colorama import Fore
 
 w = 4096
 h = w
+threshold = 20  # Image comparison allowed number of different pixels
+fuzz = 10       # Image comparison allowed percentage error in pixel value
 
 def do_cmd(cmd, output = sys.stdout):
     for arg in cmd:
@@ -42,17 +44,28 @@ def do_cmd(cmd, output = sys.stdout):
     print()
     return subprocess.call(cmd, stdout = output, stderr = output)
 
+def compare_images(a, b, c):
+    if not os.path.isfile(a):
+        return -1
+    log_name = 'magick.log'
+    with open(log_name, 'w') as output:
+        do_cmd(("magick compare -metric AE -fuzz %d%% %s %s %s" % (fuzz, a, b, c)).split(), output = output)
+    with open(log_name, 'r') as f:
+        pixels = int(f.read().strip())
+    os.remove(log_name)
+    return pixels
+
 def update_image(tmp_name, png_name):
     """Update an image only if different, otherwise just change the mod time"""
-    with open(os.devnull, 'w') as null:
-        diff_name = png_name.replace('.png', '_diff.png')
-        if not os.path.isfile(png_name) or do_cmd(("magick compare -metric AE %s %s %s" % (png_name, tmp_name, diff_name)).split(), output = null):
-            shutil.copyfile(tmp_name, png_name)
-            print(Fore.GREEN + png_name + " updated" + Fore.WHITE)
-        else:
-            os.utime(png_name, None)
-            os.remove(diff_name)
-        os.remove(tmp_name)
+    diff_name = png_name.replace('.png', '_diff.png')
+    pixels = compare_images(png_name, tmp_name, diff_name)
+    if pixels < 0 or pixels > threshold:
+        shutil.copyfile(tmp_name, png_name)
+        print(Fore.YELLOW + png_name + " updated" + Fore.WHITE, pixels if pixels > 0 else '')
+    else:
+        os.utime(png_name, None)
+        os.remove(diff_name)
+    os.remove(tmp_name)
 
 
 def depluralise(name):
diff --git a/scripts/views.py b/scripts/views.py
index 60d3a7d..0577286 100644
--- a/scripts/views.py
+++ b/scripts/views.py
@@ -149,10 +149,10 @@ def views(target, do_assemblies = None):
                                             png_name = png_name.replace('_assembly', '_assembled')
                                         changed = check_deps(mtime(png_name), dname)
                                         changed = times.check_have_time(changed, png_name)
+                                        tmp_name = 'tmp.png'
                                         if changed:
                                             print(changed)
                                             t = time.time()
-                                            tmp_name = 'tmp.png'
                                             openscad.run("-D$pose=1", "-D$explode=%d" % explode, "--projection=p", "--imgsize=4096,4096", "--autocenter", "--viewall", "-d", dname, "-o", tmp_name, png_maker_name);
                                             times.add_time(png_name, t)
                                             do_cmd(["magick", tmp_name, "-trim", "-resize", "1004x1004", "-bordercolor", "#ffffe5", "-border", "10", tmp_name])