diff --git a/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs b/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs
index d9e9bd9d5..389a3cdb7 100644
--- a/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs
+++ b/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs
@@ -41,28 +41,25 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             nameof(KnownResamplers.Welch),
         };
 
-        public static readonly TheoryData<TaperSide, TaperCorner> TaperMatrixData =
-            new TheoryData<TaperSide, TaperCorner>
-                {
-                    { TaperSide.Bottom, TaperCorner.Both },
-                    { TaperSide.Bottom, TaperCorner.LeftOrTop },
-                    { TaperSide.Bottom, TaperCorner.RightOrBottom },
-
-                    { TaperSide.Top, TaperCorner.Both },
-                    { TaperSide.Top, TaperCorner.LeftOrTop },
-                    { TaperSide.Top, TaperCorner.RightOrBottom },
+        public static readonly TheoryData<TaperSide, TaperCorner> TaperMatrixData = new TheoryData<TaperSide, TaperCorner>
+        {
+            { TaperSide.Bottom, TaperCorner.Both },
+            { TaperSide.Bottom, TaperCorner.LeftOrTop },
+            { TaperSide.Bottom, TaperCorner.RightOrBottom },
 
-                    { TaperSide.Left, TaperCorner.Both },
-                    { TaperSide.Left, TaperCorner.LeftOrTop },
-                    { TaperSide.Left, TaperCorner.RightOrBottom },
+            { TaperSide.Top, TaperCorner.Both },
+            { TaperSide.Top, TaperCorner.LeftOrTop },
+            { TaperSide.Top, TaperCorner.RightOrBottom },
 
-                    { TaperSide.Right, TaperCorner.Both },
-                    { TaperSide.Right, TaperCorner.LeftOrTop },
-                    { TaperSide.Right, TaperCorner.RightOrBottom },
+            { TaperSide.Left, TaperCorner.Both },
+            { TaperSide.Left, TaperCorner.LeftOrTop },
+            { TaperSide.Left, TaperCorner.RightOrBottom },
 
-                };
+            { TaperSide.Right, TaperCorner.Both },
+            { TaperSide.Right, TaperCorner.LeftOrTop },
+            { TaperSide.Right, TaperCorner.RightOrBottom },
 
-        
+        };
 
         public ProjectiveTransformTests(ITestOutputHelper output)
         {
@@ -98,9 +95,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
 
                 string testOutputDetails = $"{taperSide}-{taperCorner}";
                 image.DebugSave(provider, testOutputDetails);
-
-                // TODO: Review ProjectiveTransformHelper API before adding assertion
-                // image.CompareFirstFrameToReferenceOutput(TolerantComparer, provider, testOutputDetails);
+                image.CompareFirstFrameToReferenceOutput(TolerantComparer, provider, testOutputDetails);
             }
         }
 
@@ -138,4 +133,4 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             return (IResampler)property.GetValue(null);
         }
     }
-}
+}
\ No newline at end of file
diff --git a/tests/Images/External b/tests/Images/External
index 558729ec8..f641620eb 160000
--- a/tests/Images/External
+++ b/tests/Images/External
@@ -1 +1 @@
-Subproject commit 558729ec87bcf52f22362175842f88a81ccfc483
+Subproject commit f641620eb5378db49d6153bbf1443ad13bda2379