Merge branch 'SixLabors:master' into master

src/ImageSharp/Processing/Processors/Convolution/Convolution2PassProcessor{TPixel}.cs

@@ -396,6 +396,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
 
                     PixelOperations<TPixel>.Instance.ToVector4(this.configuration, sourceRow, sourceBuffer);
 
+                    Numerics.Premultiply(sourceBuffer);
+
                     ref Vector4 sourceBase = ref MemoryMarshal.GetReference(sourceBuffer);
                     ref Vector4 sourceEnd = ref Unsafe.Add(ref sourceBase, sourceBuffer.Length);
                     ref Vector4 targetStart = ref targetBase;

tests/ImageSharp.Tests/Processing/Processors/Convolution/Basic1ParameterConvolutionTests.cs

@@ -17,10 +17,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
         public static readonly TheoryData<int> Values = new TheoryData<int> { 3, 5 };
 
         public static readonly string[] InputImages =
-            {
-                TestImages.Bmp.Car,
-                TestImages.Png.CalliphoraPartial
-            };
+        {
+            TestImages.Bmp.Car,
+            TestImages.Png.CalliphoraPartial,
+            TestImages.Png.Blur
+        };
 
         [Theory]
         [WithFileCollection(nameof(InputImages), nameof(Values), PixelTypes.Rgba32)]

tests/Images/External/ReferenceOutput/Convolution/BoxBlurTest/InBox_Rgba32_blur_3.png

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tests/Images/External/ReferenceOutput/Convolution/BoxBlurTest/InBox_Rgba32_blur_5.png

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tests/Images/External/ReferenceOutput/Convolution/BoxBlurTest/OnFullImage_Rgba32_blur_3.png

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tests/Images/External/ReferenceOutput/Convolution/GaussianBlurTest/InBox_Rgba32_blur_3.png

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tests/Images/External/ReferenceOutput/Convolution/GaussianBlurTest/InBox_Rgba32_blur_5.png

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tests/Images/External/ReferenceOutput/Convolution/GaussianSharpenTest/InBox_Rgba32_blur_3.png

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