From 20199220b4dca7a8778ac1a6240dc75fb33cc7db Mon Sep 17 00:00:00 2001
From: Turnerj <git@turnerj.com>
Date: Wed, 17 Nov 2021 23:20:18 +1030
Subject: [PATCH] Add missing premultiply

---
 .../Processors/Convolution/Convolution2PassProcessor{TPixel}.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ImageSharp/Processing/Processors/Convolution/Convolution2PassProcessor{TPixel}.cs b/src/ImageSharp/Processing/Processors/Convolution/Convolution2PassProcessor{TPixel}.cs
index 365b2e2dfc..3f4809c115 100644
--- a/src/ImageSharp/Processing/Processors/Convolution/Convolution2PassProcessor{TPixel}.cs
+++ b/src/ImageSharp/Processing/Processors/Convolution/Convolution2PassProcessor{TPixel}.cs
@@ -396,6 +396,8 @@ private void Convolve4(int y, Span<Vector4> span)
 
                     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;