From 4b852e6528e76a8746a7b51d8d12dcd654afcb85 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Fri, 24 Nov 2023 21:58:10 +1000
Subject: [PATCH] Update tests, fix issues

---
 src/ImageSharp/Formats/AnimationUtilities.cs  | 50 +++++++++++++++----
 .../Formats/Gif/MetadataExtensions.cs         |  2 +-
 .../Formats/Png/Chunks/PngPhysical.cs         |  2 +-
 src/ImageSharp/Formats/Png/PngDecoderCore.cs  | 31 +++++++++---
 src/ImageSharp/Formats/Png/PngEncoderCore.cs  | 14 +++++-
 src/ImageSharp/Formats/Png/PngMetadata.cs     |  2 +-
 .../Formats/Webp/Chunks/WebpFrameData.cs      | 14 +++---
 .../Formats/Webp/MetadataExtensions.cs        |  2 +-
 .../Formats/Webp/WebpAnimationDecoder.cs      |  2 +-
 ...bpBlendingMethod.cs => WebpBlendMethod.cs} |  4 +-
 .../Formats/Webp/WebpCommonUtils.cs           |  4 +-
 .../Formats/Webp/WebpEncoderCore.cs           | 25 +++++++++-
 .../Formats/Webp/WebpFrameMetadata.cs         |  4 +-
 .../Formats/GeneralFormatTests.cs             | 14 +++---
 .../Formats/Gif/GifEncoderTests.cs            |  9 ++--
 .../Formats/Png/PngEncoderTests.cs            | 11 ++--
 .../Formats/WebP/WebpEncoderTests.cs          | 10 ++--
 .../TestUtilities/ImagingTestCaseUtility.cs   |  4 +-
 ...de_8BitColor_WithOctreeQuantizer_rgb32.bmp |  2 +-
 ...Encode_8BitColor_WithWuQuantizer_rgb32.bmp |  2 +-
 ...onFilterInBox_Rgba32_CalliphoraPartial.png |  4 +-
 ...erFilterInBox_Rgba32_CalliphoraPartial.png |  4 +-
 ...DependOnSinglePixelType_Bgra32_filter0.png |  4 +-
 ...tDependOnSinglePixelType_Rgb24_filter0.png |  4 +-
 ...DependOnSinglePixelType_Rgba32_filter0.png |  4 +-
 ...ndOnSinglePixelType_RgbaVector_filter0.png |  4 +-
 ...rksWithAllErrorDiffusers_Bike_Atkinson.png |  4 +-
 ..._WorksWithAllErrorDiffusers_Bike_Burks.png |  4 +-
 ...hAllErrorDiffusers_Bike_FloydSteinberg.png |  4 +-
 ...lErrorDiffusers_Bike_JarvisJudiceNinke.png |  4 +-
 ...orksWithAllErrorDiffusers_Bike_Sierra2.png |  4 +-
 ...orksWithAllErrorDiffusers_Bike_Sierra3.png |  4 +-
 ...sWithAllErrorDiffusers_Bike_SierraLite.png |  4 +-
 ...thAllErrorDiffusers_Bike_StevensonArce.png |  4 +-
 ...WorksWithAllErrorDiffusers_Bike_Stucki.png |  4 +-
 ...orDiffusers_CalliphoraPartial_Atkinson.png |  4 +-
 ...ErrorDiffusers_CalliphoraPartial_Burks.png |  4 +-
 ...users_CalliphoraPartial_FloydSteinberg.png |  4 +-
 ...rs_CalliphoraPartial_JarvisJudiceNinke.png |  4 +-
 ...rorDiffusers_CalliphoraPartial_Sierra2.png |  4 +-
 ...rorDiffusers_CalliphoraPartial_Sierra3.png |  4 +-
 ...Diffusers_CalliphoraPartial_SierraLite.png |  4 +-
 ...fusers_CalliphoraPartial_StevensonArce.png |  4 +-
 ...rrorDiffusers_CalliphoraPartial_Stucki.png |  4 +-
 ...DependOnSinglePixelType_Bgra32_filter0.png |  4 +-
 ...tDependOnSinglePixelType_Rgb24_filter0.png |  4 +-
 ...DependOnSinglePixelType_Rgba32_filter0.png |  4 +-
 ...ndOnSinglePixelType_RgbaVector_filter0.png |  4 +-
 ..._WorksWithAllDitherers_Bike_Bayer16x16.png |  4 +-
 ...er_WorksWithAllDitherers_Bike_Bayer2x2.png |  4 +-
 ...er_WorksWithAllDitherers_Bike_Bayer4x4.png |  4 +-
 ...er_WorksWithAllDitherers_Bike_Bayer8x8.png |  4 +-
 ..._WorksWithAllDitherers_Bike_Ordered3x3.png |  4 +-
 ...Ditherers_CalliphoraPartial_Bayer16x16.png |  4 +-
 ...llDitherers_CalliphoraPartial_Bayer2x2.png |  4 +-
 ...llDitherers_CalliphoraPartial_Bayer4x4.png |  4 +-
 ...llDitherers_CalliphoraPartial_Bayer8x8.png |  4 +-
 ...Ditherers_CalliphoraPartial_Ordered3x3.png |  4 +-
 ...zed_Encode_Artifacts_Rgba32_issue_2469.png |  4 +-
 ...InBox_Bike_OctreeQuantizer_ErrorDither.png |  4 +-
 ...ionInBox_Bike_OctreeQuantizer_NoDither.png |  4 +-
 ...Box_Bike_OctreeQuantizer_OrderedDither.png |  4 +-
 ...ke_WebSafePaletteQuantizer_ErrorDither.png |  4 +-
 ..._Bike_WebSafePaletteQuantizer_NoDither.png |  4 +-
 ..._WebSafePaletteQuantizer_OrderedDither.png |  4 +-
 ...ike_WernerPaletteQuantizer_ErrorDither.png |  4 +-
 ...x_Bike_WernerPaletteQuantizer_NoDither.png |  4 +-
 ...e_WernerPaletteQuantizer_OrderedDither.png |  4 +-
 ...tionInBox_Bike_WuQuantizer_ErrorDither.png |  4 +-
 ...izationInBox_Bike_WuQuantizer_NoDither.png |  4 +-
 ...onInBox_Bike_WuQuantizer_OrderedDither.png |  4 +-
 ...oraPartial_OctreeQuantizer_ErrorDither.png |  4 +-
 ...iphoraPartial_OctreeQuantizer_NoDither.png |  4 +-
 ...aPartial_OctreeQuantizer_OrderedDither.png |  4 +-
 ...al_WebSafePaletteQuantizer_ErrorDither.png |  4 +-
 ...rtial_WebSafePaletteQuantizer_NoDither.png |  4 +-
 ..._WebSafePaletteQuantizer_OrderedDither.png |  4 +-
 ...ial_WernerPaletteQuantizer_ErrorDither.png |  4 +-
 ...artial_WernerPaletteQuantizer_NoDither.png |  4 +-
 ...l_WernerPaletteQuantizer_OrderedDither.png |  4 +-
 ...liphoraPartial_WuQuantizer_ErrorDither.png |  4 +-
 ...CalliphoraPartial_WuQuantizer_NoDither.png |  4 +-
 ...phoraPartial_WuQuantizer_OrderedDither.png |  4 +-
 ...david_OctreeQuantizer_ErrorDither_0.25.png |  4 +-
 ..._david_OctreeQuantizer_ErrorDither_0.5.png |  4 +-
 ...david_OctreeQuantizer_ErrorDither_0.75.png |  4 +-
 ...le_david_OctreeQuantizer_ErrorDither_0.png |  4 +-
 ...le_david_OctreeQuantizer_ErrorDither_1.png |  4 +-
 ...vid_OctreeQuantizer_OrderedDither_0.25.png |  4 +-
 ...avid_OctreeQuantizer_OrderedDither_0.5.png |  4 +-
 ...vid_OctreeQuantizer_OrderedDither_0.75.png |  4 +-
 ..._david_OctreeQuantizer_OrderedDither_0.png |  4 +-
 ..._david_OctreeQuantizer_OrderedDither_1.png |  4 +-
 ...bSafePaletteQuantizer_ErrorDither_0.25.png |  4 +-
 ...ebSafePaletteQuantizer_ErrorDither_0.5.png |  4 +-
 ...bSafePaletteQuantizer_ErrorDither_0.75.png |  4 +-
 ..._WebSafePaletteQuantizer_ErrorDither_0.png |  4 +-
 ..._WebSafePaletteQuantizer_ErrorDither_1.png |  4 +-
 ...afePaletteQuantizer_OrderedDither_0.25.png |  4 +-
 ...SafePaletteQuantizer_OrderedDither_0.5.png |  4 +-
 ...afePaletteQuantizer_OrderedDither_0.75.png |  4 +-
 ...ebSafePaletteQuantizer_OrderedDither_0.png |  4 +-
 ...ebSafePaletteQuantizer_OrderedDither_1.png |  4 +-
 ...ernerPaletteQuantizer_ErrorDither_0.25.png |  4 +-
 ...WernerPaletteQuantizer_ErrorDither_0.5.png |  4 +-
 ...ernerPaletteQuantizer_ErrorDither_0.75.png |  4 +-
 ...d_WernerPaletteQuantizer_ErrorDither_0.png |  4 +-
 ...d_WernerPaletteQuantizer_ErrorDither_1.png |  4 +-
 ...nerPaletteQuantizer_OrderedDither_0.25.png |  4 +-
 ...rnerPaletteQuantizer_OrderedDither_0.5.png |  4 +-
 ...nerPaletteQuantizer_OrderedDither_0.75.png |  4 +-
 ...WernerPaletteQuantizer_OrderedDither_0.png |  4 +-
 ...WernerPaletteQuantizer_OrderedDither_1.png |  4 +-
 ...ale_david_WuQuantizer_ErrorDither_0.25.png |  4 +-
 ...cale_david_WuQuantizer_ErrorDither_0.5.png |  4 +-
 ...ale_david_WuQuantizer_ErrorDither_0.75.png |  4 +-
 ...gScale_david_WuQuantizer_ErrorDither_0.png |  4 +-
 ...gScale_david_WuQuantizer_ErrorDither_1.png |  4 +-
 ...e_david_WuQuantizer_OrderedDither_0.25.png |  4 +-
 ...le_david_WuQuantizer_OrderedDither_0.5.png |  4 +-
 ...e_david_WuQuantizer_OrderedDither_0.75.png |  4 +-
 ...cale_david_WuQuantizer_OrderedDither_0.png |  4 +-
 ...cale_david_WuQuantizer_OrderedDither_1.png |  4 +-
 ...ation_Bike_OctreeQuantizer_ErrorDither.png |  4 +-
 ...tization_Bike_OctreeQuantizer_NoDither.png |  4 +-
 ...ion_Bike_OctreeQuantizer_OrderedDither.png |  4 +-
 ...ke_WebSafePaletteQuantizer_ErrorDither.png |  4 +-
 ..._Bike_WebSafePaletteQuantizer_NoDither.png |  4 +-
 ..._WebSafePaletteQuantizer_OrderedDither.png |  4 +-
 ...ike_WernerPaletteQuantizer_ErrorDither.png |  4 +-
 ...n_Bike_WernerPaletteQuantizer_NoDither.png |  4 +-
 ...e_WernerPaletteQuantizer_OrderedDither.png |  4 +-
 ...ntization_Bike_WuQuantizer_ErrorDither.png |  4 +-
 ...Quantization_Bike_WuQuantizer_NoDither.png |  4 +-
 ...ization_Bike_WuQuantizer_OrderedDither.png |  4 +-
 ...oraPartial_OctreeQuantizer_ErrorDither.png |  4 +-
 ...iphoraPartial_OctreeQuantizer_NoDither.png |  4 +-
 ...aPartial_OctreeQuantizer_OrderedDither.png |  4 +-
 ...al_WebSafePaletteQuantizer_ErrorDither.png |  4 +-
 ...rtial_WebSafePaletteQuantizer_NoDither.png |  4 +-
 ..._WebSafePaletteQuantizer_OrderedDither.png |  4 +-
 ...ial_WernerPaletteQuantizer_ErrorDither.png |  4 +-
 ...artial_WernerPaletteQuantizer_NoDither.png |  4 +-
 ...l_WernerPaletteQuantizer_OrderedDither.png |  4 +-
 ...liphoraPartial_WuQuantizer_ErrorDither.png |  4 +-
 ...CalliphoraPartial_WuQuantizer_NoDither.png |  4 +-
 ...phoraPartial_WuQuantizer_OrderedDither.png |  4 +-
 147 files changed, 398 insertions(+), 318 deletions(-)
 rename src/ImageSharp/Formats/Webp/{WebpBlendingMethod.cs => WebpBlendMethod.cs} (92%)

diff --git a/src/ImageSharp/Formats/AnimationUtilities.cs b/src/ImageSharp/Formats/AnimationUtilities.cs
index ee9a85ac43..b66efd7f56 100644
--- a/src/ImageSharp/Formats/AnimationUtilities.cs
+++ b/src/ImageSharp/Formats/AnimationUtilities.cs
@@ -27,15 +27,19 @@ internal static class AnimationUtilities
     /// <param name="currentFrame">The current frame.</param>
     /// <param name="resultFrame">The resultant output.</param>
     /// <param name="replacement">The value to use when replacing duplicate pixels.</param>
+    /// <param name="clampingMode">The clamping bound to apply when calculating difference bounds.</param>
     /// <returns>The <see cref="ValueTuple{Boolean, Rectangle}"/> representing the operation result.</returns>
     public static (bool Difference, Rectangle Bounds) DeDuplicatePixels<TPixel>(
         Configuration configuration,
         ImageFrame<TPixel>? previousFrame,
         ImageFrame<TPixel> currentFrame,
         ImageFrame<TPixel> resultFrame,
-        Vector4 replacement)
+        Vector4 replacement,
+        ClampingMode clampingMode = ClampingMode.None)
         where TPixel : unmanaged, IPixel<TPixel>
     {
+        // TODO: This would be faster (but more complicated to find diff bounds) if we operated on Rgba32.
+        // If someone wants to do that, they have my unlimited thanks.
         MemoryAllocator memoryAllocator = configuration.MemoryAllocator;
         IMemoryOwner<Vector4> buffers = memoryAllocator.Allocate<Vector4>(currentFrame.Width * 3, AllocationOptions.Clean);
         Span<Vector4> previous = buffers.GetSpan()[..currentFrame.Width];
@@ -78,10 +82,11 @@ internal static class AnimationUtilities
                     Vector256<float> c = Unsafe.Add(ref currentBase, x);
 
                     // Compare the previous and current pixels
-                    Vector256<float> neq = Avx.CompareEqual(p, c);
-                    Vector256<int> mask = neq.AsInt32();
+                    Vector256<int> mask = Avx2.CompareEqual(p.AsInt32(), c.AsInt32());
+                    mask = Avx2.CompareEqual(mask.AsInt64(), Vector256<long>.AllBitsSet).AsInt32();
+                    mask = Avx2.And(mask, Avx2.Shuffle(mask, 0b_01_00_11_10)).AsInt32();
 
-                    neq = Avx.Xor(neq, Vector256<float>.AllBitsSet);
+                    Vector256<int> neq = Avx2.Xor(mask.AsInt64(), Vector256<long>.AllBitsSet).AsInt32();
                     int m = Avx2.MoveMask(neq.AsByte());
                     if (m != 0)
                     {
@@ -95,11 +100,7 @@ internal static class AnimationUtilities
                         hasDiff = true;
                     }
 
-                    // Capture the original alpha values.
-                    mask = Avx2.HorizontalAdd(mask, mask);
-                    mask = Avx2.HorizontalAdd(mask, mask);
-                    mask = Avx2.CompareEqual(mask, Vector256.Create(-4));
-
+                    // Replace the pixel value with the replacement if the full pixel is matched.
                     Vector256<float> r = Avx.BlendVariable(c, replacement256, mask.AsSingle());
                     Unsafe.Add(ref resultBase, x) = r;
 
@@ -153,6 +154,37 @@ internal static class AnimationUtilities
             Numerics.Clamp(right, left + 1, resultFrame.Width),
             Numerics.Clamp(bottom, top + 1, resultFrame.Height));
 
+        // Webp requires even bounds
+        if (clampingMode == ClampingMode.Even)
+        {
+            bounds.Width = Math.Min(resultFrame.Width, bounds.Width + (bounds.X & 1));
+            bounds.Height = Math.Min(resultFrame.Height, bounds.Height + (bounds.Y & 1));
+            bounds.X = Math.Max(0, bounds.X - (bounds.X & 1));
+            bounds.Y = Math.Max(0, bounds.Y - (bounds.Y & 1));
+        }
+
         return new(hasDiff, bounds);
     }
+
+    public static void CopySource<TPixel>(ImageFrame<TPixel> source, ImageFrame<TPixel> destination, Rectangle bounds)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        Buffer2DRegion<TPixel> sourceBuffer = source.PixelBuffer.GetRegion(bounds);
+        Buffer2DRegion<TPixel> destBuffer = destination.PixelBuffer.GetRegion(bounds);
+        for (int y = 0; y < destination.Height; y++)
+        {
+            Span<TPixel> sourceRow = sourceBuffer.DangerousGetRowSpan(y);
+            Span<TPixel> destRow = destBuffer.DangerousGetRowSpan(y);
+            sourceRow.CopyTo(destRow);
+        }
+    }
+}
+
+#pragma warning disable SA1201 // Elements should appear in the correct order
+internal enum ClampingMode
+#pragma warning restore SA1201 // Elements should appear in the correct order
+{
+    None,
+
+    Even,
 }
diff --git a/src/ImageSharp/Formats/Gif/MetadataExtensions.cs b/src/ImageSharp/Formats/Gif/MetadataExtensions.cs
index 1b9b6ac58c..16f788e3db 100644
--- a/src/ImageSharp/Formats/Gif/MetadataExtensions.cs
+++ b/src/ImageSharp/Formats/Gif/MetadataExtensions.cs
@@ -83,7 +83,7 @@ public static partial class MetadataExtensions
             ColorTableMode = source.ColorTableMode == GifColorTableMode.Global ? FrameColorTableMode.Global : FrameColorTableMode.Local,
             Duration = TimeSpan.FromMilliseconds(source.FrameDelay * 10),
             DisposalMode = GetMode(source.DisposalMethod),
-            BlendMode = FrameBlendMode.Over,
+            BlendMode = source.DisposalMethod == GifDisposalMethod.RestoreToBackground ? FrameBlendMode.Source : FrameBlendMode.Over,
         };
 
     private static FrameDisposalMode GetMode(GifDisposalMethod method) => method switch
diff --git a/src/ImageSharp/Formats/Png/Chunks/PngPhysical.cs b/src/ImageSharp/Formats/Png/Chunks/PngPhysical.cs
index 7847882484..8af0ac8ca7 100644
--- a/src/ImageSharp/Formats/Png/Chunks/PngPhysical.cs
+++ b/src/ImageSharp/Formats/Png/Chunks/PngPhysical.cs
@@ -61,10 +61,10 @@ internal readonly struct PngPhysical
     /// <returns>The constructed PngPhysicalChunkData instance.</returns>
     public static PngPhysical FromMetadata(ImageMetadata meta)
     {
-        byte unitSpecifier = 0;
         uint x;
         uint y;
 
+        byte unitSpecifier;
         switch (meta.ResolutionUnits)
         {
             case PixelResolutionUnit.AspectRatio:
diff --git a/src/ImageSharp/Formats/Png/PngDecoderCore.cs b/src/ImageSharp/Formats/Png/PngDecoderCore.cs
index b0706b14c7..cb4f599eb8 100644
--- a/src/ImageSharp/Formats/Png/PngDecoderCore.cs
+++ b/src/ImageSharp/Formats/Png/PngDecoderCore.cs
@@ -217,7 +217,7 @@ internal sealed class PngDecoderCore : IImageDecoderInternals
                                 chunk.Length - 4,
                                 currentFrame,
                                 pngMetadata,
-                                this.ReadNextDataChunkAndSkipSeq,
+                                this.ReadNextFrameDataChunk,
                                 currentFrameControl.Value,
                                 cancellationToken);
 
@@ -1719,19 +1719,34 @@ internal sealed class PngDecoderCore : IImageDecoderInternals
     }
 
     /// <summary>
-    /// Reads the next data chunk and skip sequence number.
+    /// Reads the next animated frame data chunk.
     /// </summary>
     /// <returns>Count of bytes in the next data chunk, or 0 if there are no more data chunks left.</returns>
-    private int ReadNextDataChunkAndSkipSeq()
+    private int ReadNextFrameDataChunk()
     {
-        int length = this.ReadNextDataChunk();
-        if (this.ReadNextDataChunk() is 0)
+        if (this.nextChunk != null)
         {
-            return length;
+            return 0;
         }
 
-        this.currentStream.Position += 4; // Skip sequence number
-        return length - 4;
+        Span<byte> buffer = stackalloc byte[20];
+
+        _ = this.currentStream.Read(buffer, 0, 4);
+
+        if (this.TryReadChunk(buffer, out PngChunk chunk))
+        {
+            if (chunk.Type is PngChunkType.FrameData)
+            {
+                chunk.Data?.Dispose();
+
+                this.currentStream.Position += 4; // Skip sequence number
+                return chunk.Length - 4;
+            }
+
+            this.nextChunk = chunk;
+        }
+
+        return 0;
     }
 
     /// <summary>
diff --git a/src/ImageSharp/Formats/Png/PngEncoderCore.cs b/src/ImageSharp/Formats/Png/PngEncoderCore.cs
index 016c422337..7908109e8e 100644
--- a/src/ImageSharp/Formats/Png/PngEncoderCore.cs
+++ b/src/ImageSharp/Formats/Png/PngEncoderCore.cs
@@ -214,6 +214,16 @@ internal sealed class PngEncoderCore : IImageEncoderInternals, IDisposable
                 ImageFrame<TPixel>? prev = previousDisposal == PngDisposalMethod.RestoreToBackground ? null : previousFrame;
                 (bool difference, Rectangle bounds) = AnimationUtilities.DeDuplicatePixels(image.Configuration, prev, currentFrame, encodingFrame, Vector4.Zero);
 
+                if (difference && previousDisposal != PngDisposalMethod.RestoreToBackground)
+                {
+                    if (frameMetadata.BlendMethod == PngBlendMethod.Source)
+                    {
+                        // We've potentially introduced transparency within our area of interest
+                        // so we need to overwrite the changed area with the full data.
+                        AnimationUtilities.CopySource(currentFrame, encodingFrame, bounds);
+                    }
+                }
+
                 if (clearTransparency)
                 {
                     ClearTransparentPixels(encodingFrame);
@@ -258,7 +268,7 @@ internal sealed class PngEncoderCore : IImageEncoderInternals, IDisposable
     {
         if (image.Metadata.TryGetPngMetadata(out PngMetadata? png))
         {
-            return png;
+            return (PngMetadata)png.DeepClone();
         }
 
         if (image.Metadata.TryGetGifMetadata(out GifMetadata? gif))
@@ -282,7 +292,7 @@ internal sealed class PngEncoderCore : IImageEncoderInternals, IDisposable
     {
         if (frame.Metadata.TryGetPngMetadata(out PngFrameMetadata? png))
         {
-            return png;
+            return (PngFrameMetadata)png.DeepClone();
         }
 
         if (frame.Metadata.TryGetGifMetadata(out GifFrameMetadata? gif))
diff --git a/src/ImageSharp/Formats/Png/PngMetadata.cs b/src/ImageSharp/Formats/Png/PngMetadata.cs
index 7f4052846a..128237684c 100644
--- a/src/ImageSharp/Formats/Png/PngMetadata.cs
+++ b/src/ImageSharp/Formats/Png/PngMetadata.cs
@@ -100,7 +100,7 @@ public class PngMetadata : IDeepCloneable
                 if (c == metadata.BackgroundColor)
                 {
                     // Png treats background as fully empty
-                    c = default;
+                    c = Color.Transparent;
                     break;
                 }
             }
diff --git a/src/ImageSharp/Formats/Webp/Chunks/WebpFrameData.cs b/src/ImageSharp/Formats/Webp/Chunks/WebpFrameData.cs
index c8c4a74a00..5ed7aab1ea 100644
--- a/src/ImageSharp/Formats/Webp/Chunks/WebpFrameData.cs
+++ b/src/ImageSharp/Formats/Webp/Chunks/WebpFrameData.cs
@@ -12,7 +12,7 @@ internal readonly struct WebpFrameData
     /// </summary>
     public const uint HeaderSize = 16;
 
-    public WebpFrameData(uint dataSize, uint x, uint y, uint width, uint height, uint duration, WebpBlendingMethod blendingMethod, WebpDisposalMethod disposalMethod)
+    public WebpFrameData(uint dataSize, uint x, uint y, uint width, uint height, uint duration, WebpBlendMethod blendingMethod, WebpDisposalMethod disposalMethod)
     {
         this.DataSize = dataSize;
         this.X = x;
@@ -32,12 +32,12 @@ internal readonly struct WebpFrameData
             width,
             height,
             duration,
-            (flags & 2) == 0 ? WebpBlendingMethod.Over : WebpBlendingMethod.Source,
+            (flags & 2) == 0 ? WebpBlendMethod.Over : WebpBlendMethod.Source,
             (flags & 1) == 1 ? WebpDisposalMethod.RestoreToBackground : WebpDisposalMethod.DoNotDispose)
     {
     }
 
-    public WebpFrameData(uint x, uint y, uint width, uint height, uint duration, WebpBlendingMethod blendingMethod, WebpDisposalMethod disposalMethod)
+    public WebpFrameData(uint x, uint y, uint width, uint height, uint duration, WebpBlendMethod blendingMethod, WebpDisposalMethod disposalMethod)
         : this(0, x, y, width, height, duration, blendingMethod, disposalMethod)
     {
     }
@@ -76,7 +76,7 @@ internal readonly struct WebpFrameData
     /// <summary>
     /// Gets how transparent pixels of the current frame are to be blended with corresponding pixels of the previous canvas.
     /// </summary>
-    public WebpBlendingMethod BlendingMethod { get; }
+    public WebpBlendMethod BlendingMethod { get; }
 
     /// <summary>
     /// Gets how the current frame is to be treated after it has been displayed (before rendering the next frame) on the canvas.
@@ -93,7 +93,7 @@ internal readonly struct WebpFrameData
     {
         byte flags = 0;
 
-        if (this.BlendingMethod is WebpBlendingMethod.Source)
+        if (this.BlendingMethod is WebpBlendMethod.Source)
         {
             // Set blending flag.
             flags |= 2;
@@ -107,8 +107,8 @@ internal readonly struct WebpFrameData
 
         long pos = RiffHelper.BeginWriteChunk(stream, (uint)WebpChunkType.FrameData);
 
-        WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.X / 2);
-        WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Y / 2);
+        WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, (uint)Math.Round(this.X / 2f));
+        WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, (uint)Math.Round(this.Y / 2f));
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Width - 1);
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Height - 1);
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Duration);
diff --git a/src/ImageSharp/Formats/Webp/MetadataExtensions.cs b/src/ImageSharp/Formats/Webp/MetadataExtensions.cs
index 10c72a3d9c..731d3f1ff2 100644
--- a/src/ImageSharp/Formats/Webp/MetadataExtensions.cs
+++ b/src/ImageSharp/Formats/Webp/MetadataExtensions.cs
@@ -63,7 +63,7 @@ public static partial class MetadataExtensions
             ColorTableMode = FrameColorTableMode.Global,
             Duration = TimeSpan.FromMilliseconds(source.FrameDelay),
             DisposalMode = GetMode(source.DisposalMethod),
-            BlendMode = source.BlendMethod == WebpBlendingMethod.Over ? FrameBlendMode.Over : FrameBlendMode.Source,
+            BlendMode = source.BlendMethod == WebpBlendMethod.Over ? FrameBlendMode.Over : FrameBlendMode.Source,
         };
 
     private static FrameDisposalMode GetMode(WebpDisposalMethod method) => method switch
diff --git a/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs b/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs
index d85096c2e8..65f1a4da46 100644
--- a/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs
+++ b/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs
@@ -202,7 +202,7 @@ internal class WebpAnimationDecoder : IDisposable
 
         using Buffer2D<TPixel> decodedImageFrame = this.DecodeImageFrameData<TPixel>(frameData, webpInfo);
 
-        bool blend = previousFrame != null && frameData.BlendingMethod == WebpBlendingMethod.Over;
+        bool blend = previousFrame != null && frameData.BlendingMethod == WebpBlendMethod.Over;
         DrawDecodedImageFrameOnCanvas(decodedImageFrame, imageFrame, regionRectangle, blend);
 
         previousFrame = currentFrame ?? image.Frames.RootFrame;
diff --git a/src/ImageSharp/Formats/Webp/WebpBlendingMethod.cs b/src/ImageSharp/Formats/Webp/WebpBlendMethod.cs
similarity index 92%
rename from src/ImageSharp/Formats/Webp/WebpBlendingMethod.cs
rename to src/ImageSharp/Formats/Webp/WebpBlendMethod.cs
index 482d62cd23..f16f7650c7 100644
--- a/src/ImageSharp/Formats/Webp/WebpBlendingMethod.cs
+++ b/src/ImageSharp/Formats/Webp/WebpBlendMethod.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 namespace SixLabors.ImageSharp.Formats.Webp;
@@ -6,7 +6,7 @@ namespace SixLabors.ImageSharp.Formats.Webp;
 /// <summary>
 /// Indicates how transparent pixels of the current frame are to be blended with corresponding pixels of the previous canvas.
 /// </summary>
-public enum WebpBlendingMethod
+public enum WebpBlendMethod
 {
     /// <summary>
     /// Do not blend. After disposing of the previous frame,
diff --git a/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs b/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs
index bb7dd6f279..49482260bb 100644
--- a/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs
+++ b/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs
@@ -20,7 +20,7 @@ internal static class WebpCommonUtils
     {
         if (image.Metadata.TryGetWebpMetadata(out WebpMetadata? webp))
         {
-            return webp;
+            return (WebpMetadata)webp.DeepClone();
         }
 
         if (image.Metadata.TryGetGifMetadata(out GifMetadata? gif))
@@ -44,7 +44,7 @@ internal static class WebpCommonUtils
     {
         if (frame.Metadata.TryGetWebpFrameMetadata(out WebpFrameMetadata? webp))
         {
-            return webp;
+            return (WebpFrameMetadata)webp.DeepClone();
         }
 
         if (frame.Metadata.TryGetGifMetadata(out GifFrameMetadata? gif))
diff --git a/src/ImageSharp/Formats/Webp/WebpEncoderCore.cs b/src/ImageSharp/Formats/Webp/WebpEncoderCore.cs
index 7357e097c9..db12d7c676 100644
--- a/src/ImageSharp/Formats/Webp/WebpEncoderCore.cs
+++ b/src/ImageSharp/Formats/Webp/WebpEncoderCore.cs
@@ -165,7 +165,18 @@ internal sealed class WebpEncoderCore : IImageEncoderInternals
                     frameMetadata = WebpCommonUtils.GetWebpFrameMetadata(currentFrame);
 
                     ImageFrame<TPixel>? prev = previousDisposal == WebpDisposalMethod.RestoreToBackground ? null : previousFrame;
-                    (bool difference, Rectangle bounds) = AnimationUtilities.DeDuplicatePixels(image.Configuration, prev, currentFrame, encodingFrame, Vector4.Zero);
+
+                    (bool difference, Rectangle bounds) = AnimationUtilities.DeDuplicatePixels(image.Configuration, prev, currentFrame, encodingFrame, Vector4.Zero, ClampingMode.Even);
+
+                    if (difference && previousDisposal != WebpDisposalMethod.RestoreToBackground)
+                    {
+                        if (frameMetadata.BlendMethod == WebpBlendMethod.Source)
+                        {
+                            // We've potentially introduced transparency within our area of interest
+                            // so we need to overwrite the changed area with the full data.
+                            AnimationUtilities.CopySource(currentFrame, encodingFrame, bounds);
+                        }
+                    }
 
                     using Vp8LEncoder animatedEncoder = new(
                         this.memoryAllocator,
@@ -225,7 +236,17 @@ internal sealed class WebpEncoderCore : IImageEncoderInternals
                     frameMetadata = WebpCommonUtils.GetWebpFrameMetadata(currentFrame);
 
                     ImageFrame<TPixel>? prev = previousDisposal == WebpDisposalMethod.RestoreToBackground ? null : previousFrame;
-                    (bool difference, Rectangle bounds) = AnimationUtilities.DeDuplicatePixels(image.Configuration, prev, currentFrame, encodingFrame, Vector4.Zero);
+                    (bool difference, Rectangle bounds) = AnimationUtilities.DeDuplicatePixels(image.Configuration, prev, currentFrame, encodingFrame, Vector4.Zero, ClampingMode.Even);
+
+                    if (difference && previousDisposal != WebpDisposalMethod.RestoreToBackground)
+                    {
+                        if (frameMetadata.BlendMethod == WebpBlendMethod.Source)
+                        {
+                            // We've potentially introduced transparency within our area of interest
+                            // so we need to overwrite the changed area with the full data.
+                            AnimationUtilities.CopySource(currentFrame, encodingFrame, bounds);
+                        }
+                    }
 
                     using Vp8Encoder animatedEncoder = new(
                         this.memoryAllocator,
diff --git a/src/ImageSharp/Formats/Webp/WebpFrameMetadata.cs b/src/ImageSharp/Formats/Webp/WebpFrameMetadata.cs
index 667b8f8f46..422ad6bc7c 100644
--- a/src/ImageSharp/Formats/Webp/WebpFrameMetadata.cs
+++ b/src/ImageSharp/Formats/Webp/WebpFrameMetadata.cs
@@ -29,7 +29,7 @@ public class WebpFrameMetadata : IDeepCloneable
     /// <summary>
     /// Gets or sets how transparent pixels of the current frame are to be blended with corresponding pixels of the previous canvas.
     /// </summary>
-    public WebpBlendingMethod BlendMethod { get; set; }
+    public WebpBlendMethod BlendMethod { get; set; }
 
     /// <summary>
     /// Gets or sets how the current frame is to be treated after it has been displayed (before rendering the next frame) on the canvas.
@@ -49,7 +49,7 @@ public class WebpFrameMetadata : IDeepCloneable
         => new()
         {
             FrameDelay = (uint)metadata.Duration.Milliseconds,
-            BlendMethod = metadata.BlendMode == FrameBlendMode.Source ? WebpBlendingMethod.Source : WebpBlendingMethod.Over,
+            BlendMethod = metadata.BlendMode == FrameBlendMode.Source ? WebpBlendMethod.Source : WebpBlendMethod.Over,
             DisposalMethod = metadata.DisposalMode == FrameDisposalMode.RestoreToBackground ? WebpDisposalMethod.RestoreToBackground : WebpDisposalMethod.DoNotDispose
         };
 }
diff --git a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
index 1d84d6600a..27511f7beb 100644
--- a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
+++ b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
@@ -162,37 +162,37 @@ public class GeneralFormatTests
         foreach (TestFile file in Files)
         {
             using Image<Rgba32> image = file.CreateRgba32Image();
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.bmp")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.bmp")))
             {
                 image.SaveAsBmp(output);
             }
 
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.jpg")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.jpg")))
             {
                 image.SaveAsJpeg(output);
             }
 
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.pbm")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.pbm")))
             {
                 image.SaveAsPbm(output);
             }
 
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.png")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.png")))
             {
                 image.SaveAsPng(output);
             }
 
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.gif")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.gif")))
             {
                 image.SaveAsGif(output);
             }
 
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.tga")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.tga")))
             {
                 image.SaveAsTga(output);
             }
 
-            using (FileStream output = File.OpenWrite(Path.Combine(path, $"{file.FileNameWithoutExtension}.tiff")))
+            using (FileStream output = File.Create(Path.Combine(path, $"{file.FileNameWithoutExtension}.tiff")))
             {
                 image.SaveAsTiff(output);
             }
diff --git a/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs
index ef04a4fbaf..d6d63baabf 100644
--- a/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs
@@ -360,15 +360,16 @@ public class GifEncoderTests
 
     public static string[] Animated => TestImages.Gif.Animated;
 
-    [Theory]//(Skip = "Enable for visual animated testing")]
+    [Theory(Skip = "Enable for visual animated testing")]
     [WithFileCollection(nameof(Animated), PixelTypes.Rgba32)]
     public void Encode_Animated_VisualTest<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel>
     {
         using Image<TPixel> image = provider.GetImage();
 
-        //image.DebugSaveMultiFrame(provider);
-
-        provider.Utility.SaveTestOutputFile(image, "gif", new GifEncoder() { ColorTableMode = GifColorTableMode.Local}, "animated");
+        provider.Utility.SaveTestOutputFile(image, "webp", new WebpEncoder() { FileFormat = WebpFileFormatType.Lossless }, "animated");
+        provider.Utility.SaveTestOutputFile(image, "webp", new WebpEncoder() { FileFormat = WebpFileFormatType.Lossy }, "animated-lossy");
+        provider.Utility.SaveTestOutputFile(image, "png", new PngEncoder(), "animated");
+        provider.Utility.SaveTestOutputFile(image, "gif", new GifEncoder(), "animated");
     }
 }
diff --git a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
index 45dd30b3b0..f8fc774b78 100644
--- a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
@@ -479,19 +479,16 @@ public partial class PngEncoderTests
     }
 
     [Theory]
-    [WithFile(TestImages.Gif.Giphy, PixelTypes.Rgba32)]
+    [WithFile(TestImages.Gif.Leo, PixelTypes.Rgba32)]
     public void Encode_AnimatedFormatTransform_FromGif<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel>
     {
         using Image<TPixel> image = provider.GetImage(GifDecoder.Instance);
-        using MemoryStream memStream = new();
 
+        using MemoryStream memStream = new();
         image.Save(memStream, PngEncoder);
         memStream.Position = 0;
 
-        image.Save(provider.Utility.GetTestOutputFileName("png"), new PngEncoder());
-        image.Save(provider.Utility.GetTestOutputFileName("gif"), new GifEncoder());
-
         using Image<TPixel> output = Image.Load<TPixel>(memStream);
 
         // TODO: Find a better way to compare.
@@ -556,10 +553,10 @@ public partial class PngEncoderTests
 
             switch (webpF.BlendMethod)
             {
-                case WebpBlendingMethod.Source:
+                case WebpBlendMethod.Source:
                     Assert.Equal(PngBlendMethod.Source, pngF.BlendMethod);
                     break;
-                case WebpBlendingMethod.Over:
+                case WebpBlendMethod.Over:
                 default:
                     Assert.Equal(PngBlendMethod.Over, pngF.BlendMethod);
                     break;
diff --git a/tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs b/tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs
index 0fafdbe161..6baacb38ce 100644
--- a/tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs
@@ -63,7 +63,7 @@ public class WebpEncoderTests
     }
 
     [Theory]
-    [WithFile(TestImages.Gif.Giphy, PixelTypes.Rgba32)]
+    [WithFile(TestImages.Gif.Leo, PixelTypes.Rgba32)]
     public void Encode_AnimatedFormatTransform_FromGif<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel>
     {
@@ -115,6 +115,10 @@ public class WebpEncoderTests
         image.Save(memStream, new WebpEncoder());
         memStream.Position = 0;
 
+        provider.Utility.SaveTestOutputFile(image, "gif", new GifEncoder());
+        provider.Utility.SaveTestOutputFile(image, "png", new PngEncoder());
+        provider.Utility.SaveTestOutputFile(image, "webp", new WebpEncoder());
+
         using Image<TPixel> output = Image.Load<TPixel>(memStream);
         ImageComparer.Exact.VerifySimilarity(output, image);
         PngMetadata png = image.Metadata.GetPngMetadata();
@@ -132,11 +136,11 @@ public class WebpEncoderTests
             switch (pngF.BlendMethod)
             {
                 case PngBlendMethod.Source:
-                    Assert.Equal(WebpBlendingMethod.Source, webpF.BlendMethod);
+                    Assert.Equal(WebpBlendMethod.Source, webpF.BlendMethod);
                     break;
                 case PngBlendMethod.Over:
                 default:
-                    Assert.Equal(WebpBlendingMethod.Over, webpF.BlendMethod);
+                    Assert.Equal(WebpBlendMethod.Over, webpF.BlendMethod);
                     break;
             }
 
diff --git a/tests/ImageSharp.Tests/TestUtilities/ImagingTestCaseUtility.cs b/tests/ImageSharp.Tests/TestUtilities/ImagingTestCaseUtility.cs
index 9b100047f0..2243c852d2 100644
--- a/tests/ImageSharp.Tests/TestUtilities/ImagingTestCaseUtility.cs
+++ b/tests/ImageSharp.Tests/TestUtilities/ImagingTestCaseUtility.cs
@@ -171,7 +171,7 @@ public class ImagingTestCaseUtility
 
         encoder ??= TestEnvironment.GetReferenceEncoder(path);
 
-        using (FileStream stream = File.OpenWrite(path))
+        using (FileStream stream = File.Create(path))
         {
             image.Save(stream, encoder);
         }
@@ -227,7 +227,7 @@ public class ImagingTestCaseUtility
         {
             using Image<TPixel> frameImage = image.Frames.CloneFrame(file.Index);
             string filePath = file.FileName;
-            using FileStream stream = File.OpenWrite(filePath);
+            using FileStream stream = File.Create(filePath);
             frameImage.Save(stream, encoder);
         }
 
diff --git a/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithOctreeQuantizer_rgb32.bmp b/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithOctreeQuantizer_rgb32.bmp
index 2b8e05b070..d484eace0f 100644
--- a/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithOctreeQuantizer_rgb32.bmp
+++ b/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithOctreeQuantizer_rgb32.bmp
@@ -1,3 +1,3 @@
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-oid sha256:11375b15df083d98335f4a4baf0717e7fdd6b21ab2132a6815cadc787ac17e7d
+oid sha256:23a9d9233314ec08bd3e464f245e69d96566cbb12d2dba36c69bba483d6ba6b8
 size 9270
diff --git a/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithWuQuantizer_rgb32.bmp b/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithWuQuantizer_rgb32.bmp
index f7eb06c558..6896c4fa6a 100644
--- a/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithWuQuantizer_rgb32.bmp
+++ b/tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithWuQuantizer_rgb32.bmp
@@ -1,3 +1,3 @@
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-oid sha256:e063e97cd8a000de6830adcc3961a7dc41785d40cd4d83af10ca38d96e071362
+oid sha256:3052831cb18fecc26f54e29dfe19b538d2e0d3c104ddd7ec5bc8e0adcf56693c
 size 9270
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/ApplyDiffusionFilterInBox_Rgba32_CalliphoraPartial.png b/tests/Images/External/ReferenceOutput/DitherTests/ApplyDiffusionFilterInBox_Rgba32_CalliphoraPartial.png
index dd2f49f08b..39bb7e52b9 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/ApplyDiffusionFilterInBox_Rgba32_CalliphoraPartial.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/ApplyDiffusionFilterInBox_Rgba32_CalliphoraPartial.png
@@ -1,3 +1,3 @@
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-oid sha256:cafc426ac8e8d02a87f67c90e8c1976c5fae0e12b49deae52ad08476f7ed49a4
-size 266391
+oid sha256:e89597ab9aa006d026a560d1482350739bd93604d9c6726f6730d782c017a0a3
+size 273049
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/ApplyDitherFilterInBox_Rgba32_CalliphoraPartial.png b/tests/Images/External/ReferenceOutput/DitherTests/ApplyDitherFilterInBox_Rgba32_CalliphoraPartial.png
index f226b166e4..133112867c 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/ApplyDitherFilterInBox_Rgba32_CalliphoraPartial.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/ApplyDitherFilterInBox_Rgba32_CalliphoraPartial.png
@@ -1,3 +1,3 @@
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-oid sha256:98115a7087aced0c28cefa32a57bc72be245886cabeefc4ff7faf7984236218c
-size 271226
+oid sha256:59d331efd9e6d926eaf90bed1f76b3ba55b2a42d2f83fc512a985cdea97781ec
+size 271152
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Bgra32_filter0.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Bgra32_filter0.png
index daa4b5e437..cac3b9c421 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Bgra32_filter0.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Bgra32_filter0.png
@@ -1,3 +1,3 @@
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-oid sha256:0369747820c86bb692fc7b75f3519095c9b2a58a885ebd37c871c103d08405a0
-size 720
+oid sha256:3cee43ebaefd94bcd993b8548f734a0a44b948a532263b8d2ee41b0cd42ab7a9
+size 727
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgb24_filter0.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgb24_filter0.png
index daa4b5e437..cac3b9c421 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgb24_filter0.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgb24_filter0.png
@@ -1,3 +1,3 @@
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-oid sha256:0369747820c86bb692fc7b75f3519095c9b2a58a885ebd37c871c103d08405a0
-size 720
+oid sha256:3cee43ebaefd94bcd993b8548f734a0a44b948a532263b8d2ee41b0cd42ab7a9
+size 727
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgba32_filter0.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgba32_filter0.png
index daa4b5e437..cac3b9c421 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgba32_filter0.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgba32_filter0.png
@@ -1,3 +1,3 @@
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-oid sha256:0369747820c86bb692fc7b75f3519095c9b2a58a885ebd37c871c103d08405a0
-size 720
+oid sha256:3cee43ebaefd94bcd993b8548f734a0a44b948a532263b8d2ee41b0cd42ab7a9
+size 727
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_RgbaVector_filter0.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_RgbaVector_filter0.png
index d8f9b640dd..4a3a1e874b 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_RgbaVector_filter0.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_RgbaVector_filter0.png
@@ -1,3 +1,3 @@
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-size 720
+oid sha256:2f6df6c76c0f3795c439147fd49d658e52fae5c24a071ee0f4fed7aa096d87d1
+size 719
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Atkinson.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Atkinson.png
index 3656e32db6..5db7bd5ef3 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Atkinson.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Atkinson.png
@@ -1,3 +1,3 @@
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-oid sha256:471eaf2e532b40592c86dc816709d3ae4bbd64892006e00fd611ef6869d3b934
-size 52070
+oid sha256:c419d6b6cb589f95bff06514e3a5da37d7b5704aa3f9e6f4365fe5e00c6d81d1
+size 50670
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Burks.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Burks.png
index 7cafd50c17..b2c8578011 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Burks.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Burks.png
@@ -1,3 +1,3 @@
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-size 61447
+oid sha256:90c337c38076fb597ecde87e0e8b5b95c369a90a99e64c5add3b31fc778cb52d
+size 61178
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_FloydSteinberg.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_FloydSteinberg.png
index 5d0c82e058..7ceb6114ad 100644
--- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_FloydSteinberg.png
+++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_FloydSteinberg.png
@@ -1,3 +1,3 @@
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+oid sha256:7ce4b978b800820275635ae8da59212661c74a1b6ba9050ebf052c87315aedef
+size 62107
diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_JarvisJudiceNinke.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_JarvisJudiceNinke.png
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