reduce toleance values

tests/ImageSharp.Tests/Processing/Processors/Dithering/DitherTests.cs

@@ -75,7 +75,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         }
 
         [Theory]
-        [WithFile(TestImages.Png.Bike, CommonNonDefaultPixelTypes)]
+        [WithFile(TestImages.Png.Filter0, CommonNonDefaultPixelTypes)]
         public void DitherFilter_ShouldNotDependOnSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
@@ -87,7 +87,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         }
 
         [Theory]
-        [WithFile(TestImages.Png.Bike, CommonNonDefaultPixelTypes)]
+        [WithFile(TestImages.Png.Filter0, CommonNonDefaultPixelTypes)]
         public void DiffusionFilter_ShouldNotDependOnSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {

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

@@ -8,6 +8,7 @@ using Xunit;
 namespace SixLabors.ImageSharp.Tests.Processing.Processors.Filters
 {
     using SixLabors.ImageSharp.Processing.Filters;
+    using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
 
     [GroupOutput("Filters")]
     public class BlackWhiteTest
@@ -17,7 +18,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Filters
         public void ApplyBlackWhiteFilter<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            provider.RunValidatingProcessorTest(ctx => ctx.BlackWhite());
+            provider.RunValidatingProcessorTest(ctx => ctx.BlackWhite(), comparer: ImageComparer.TolerantPercentage(0.002f));
         }
     }
 }

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

@@ -16,6 +16,8 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Filters
     [GroupOutput("Filters")]
     public class FilterTest
     {
+        private static readonly ImageComparer ValidatorComparer = ImageComparer.TolerantPercentage(0.02f);
+
         // Testing the generic FilterProcessor with more than one pixel type intentionally.
         // There is no need to do this with the specialized ones.
         [Theory]
@@ -25,7 +27,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Filters
         {
             Matrix4x4 m = CreateCombinedTestFilterMatrix();
 
-            provider.RunValidatingProcessorTest(x => x.Filter(m));
+            provider.RunValidatingProcessorTest(x => x.Filter(m), comparer: ValidatorComparer);
         }
 
         [Theory]
@@ -35,7 +37,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Filters
         {
             Matrix4x4 m = CreateCombinedTestFilterMatrix();
 
-            provider.RunRectangleConstrainedValidatingProcessorTest((x, b) => x.Filter(m, b));
+            provider.RunRectangleConstrainedValidatingProcessorTest((x, b) => x.Filter(m, b), comparer: ValidatorComparer);
         }
 
         private static Matrix4x4 CreateCombinedTestFilterMatrix()

tests/ImageSharp.Tests/TestUtilities/TestUtils.cs

@@ -167,7 +167,7 @@ namespace SixLabors.ImageSharp.Tests
         {
             if (comparer == null)
             {
-                comparer = ImageComparer.Tolerant(0.5f / 100);
+                comparer = ImageComparer.TolerantPercentage(0.001f);
             }
 
             using (Image<TPixel> image = provider.GetImage())
@@ -195,7 +195,7 @@ namespace SixLabors.ImageSharp.Tests
         {
             if (comparer == null)
             {
-                comparer = ImageComparer.Tolerant(0.5f / 100);
+                comparer = ImageComparer.TolerantPercentage(0.001f);
             }
 
             using (Image<TPixel> image = provider.GetImage())