trying to fine-tune tolerance values

tests/ImageSharp.Tests/Processing/Processors/Filters/FilterTest.cs

@@ -16,7 +16,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Filters
     [GroupOutput("Filters")]
     public class FilterTest
     {
-        private static readonly ImageComparer ValidatorComparer = ImageComparer.TolerantPercentage(0.02f);
+        private static readonly ImageComparer ValidatorComparer = ImageComparer.TolerantPercentage(0.005f, 3);
 
         // Testing the generic FilterProcessor with more than one pixel type intentionally.
         // There is no need to do this with the specialized ones.

tests/ImageSharp.Tests/Processing/Transforms/AffineTransformTests.cs

@@ -18,7 +18,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
     {
         private readonly ITestOutputHelper Output;
 
-        private static readonly ImageComparer ValidatorComparer = ImageComparer.TolerantPercentage(0.005f);
+        private static readonly ImageComparer ValidatorComparer = ImageComparer.TolerantPercentage(0.005f, 3);
 
         /// <summary>
         /// angleDeg, sx, sy, tx, ty

tests/ImageSharp.Tests/TestUtilities/ImageComparison/ImageComparer.cs

@@ -28,8 +28,9 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison
         /// <summary>
         /// Returns Tolerant(imageThresholdInPercents/100)
         /// </summary>
-        public static ImageComparer TolerantPercentage(float imageThresholdInPercents) =>
-            Tolerant(imageThresholdInPercents / 100f);
+        public static ImageComparer TolerantPercentage(float imageThresholdInPercents,
+                                                       int perPixelManhattanThreshold = 0) =>
+            Tolerant(imageThresholdInPercents / 100f, perPixelManhattanThreshold);
 
         public abstract ImageSimilarityReport<TPixelA, TPixelB> CompareImagesOrFrames<TPixelA, TPixelB>(
             ImageFrame<TPixelA> expected,