Merge branch 'main' into pt/tiff-encoder-l16

src/ImageSharp/Formats/Gif/GifEncoderCore.cs

@@ -171,7 +171,10 @@ internal sealed class GifEncoderCore : IImageEncoderInternals
             quantized = null;
         }
 
-        paletteQuantizer.Dispose();
+        if (hasPaletteQuantizer)
+        {
+            paletteQuantizer.Dispose();
+        }
     }
 
     private void EncodeFrame<TPixel>(

src/ImageSharp/PixelFormats/PixelImplementations/A8.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -140,7 +139,7 @@ public partial struct A8 : IPixel<A8>, IPackedVector<byte>
     /// </summary>
     /// <param name="obj">The object to compare.</param>
     /// <returns>True if the object is equal to the packed vector.</returns>
-    public override readonly bool Equals(object obj) => obj is A8 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is A8 other && this.Equals(other);
 
     /// <summary>
     /// Compares another A8 packed vector with the packed vector.

src/ImageSharp/PixelFormats/PixelImplementations/Abgr32.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -335,7 +334,7 @@ public partial struct Abgr32 : IPixel<Abgr32>, IPackedVector<uint>
     }
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is Abgr32 abgr32 && this.Equals(abgr32);
+    public override readonly bool Equals(object? obj) => obj is Abgr32 abgr32 && this.Equals(abgr32);
 
     /// <inheritdoc/>
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Argb32.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -334,7 +333,7 @@ public partial struct Argb32 : IPixel<Argb32>, IPackedVector<uint>
     }
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is Argb32 argb32 && this.Equals(argb32);
+    public override readonly bool Equals(object? obj) => obj is Argb32 argb32 && this.Equals(argb32);
 
     /// <inheritdoc/>
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Bgr24.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -232,7 +231,7 @@ public partial struct Bgr24 : IPixel<Bgr24>
     public readonly bool Equals(Bgr24 other) => this.R.Equals(other.R) && this.G.Equals(other.G) && this.B.Equals(other.B);
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is Bgr24 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Bgr24 other && this.Equals(other);
 
     /// <inheritdoc />
     public override readonly string ToString() => $"Bgr24({this.B}, {this.G}, {this.R})";

src/ImageSharp/PixelFormats/PixelImplementations/Bgr565.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -151,7 +150,7 @@ public partial struct Bgr565 : IPixel<Bgr565>, IPackedVector<ushort>
                    (this.PackedValue & 0x1F) * (1F / 31F));
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Bgr565 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Bgr565 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Bgra32.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -287,7 +286,7 @@ public partial struct Bgra32 : IPixel<Bgra32>, IPackedVector<uint>
     }
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is Bgra32 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Bgra32 other && this.Equals(other);
 
     /// <inheritdoc/>
     public readonly bool Equals(Bgra32 other) => this.Bgra.Equals(other.Bgra);

src/ImageSharp/PixelFormats/PixelImplementations/Bgra4444.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -143,7 +142,7 @@ public partial struct Bgra4444 : IPixel<Bgra4444>, IPackedVector<ushort>
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Bgra4444 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Bgra4444 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Byte4.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -141,7 +140,7 @@ public partial struct Byte4 : IPixel<Byte4>, IPackedVector<uint>
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Byte4 byte4 && this.Equals(byte4);
+    public override readonly bool Equals(object? obj) => obj is Byte4 byte4 && this.Equals(byte4);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/HalfSingle.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -140,7 +139,7 @@ public partial struct HalfSingle : IPixel<HalfSingle>, IPackedVector<ushort>
     public readonly float ToSingle() => HalfTypeHelper.Unpack(this.PackedValue);
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is HalfSingle other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is HalfSingle other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/HalfVector2.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -157,7 +156,7 @@ public partial struct HalfVector2 : IPixel<HalfVector2>, IPackedVector<uint>
     }
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is HalfVector2 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is HalfVector2 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/HalfVector4.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -149,7 +148,7 @@ public partial struct HalfVector4 : IPixel<HalfVector4>, IPackedVector<ulong>
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is HalfVector4 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is HalfVector4 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/L16.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -153,7 +152,7 @@ public partial struct L16 : IPixel<L16>, IPackedVector<ushort>
     public void FromRgba64(Rgba64 source) => this.PackedValue = ColorNumerics.Get16BitBT709Luminance(source.R, source.G, source.B);
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is L16 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is L16 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/L8.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -143,7 +142,7 @@ public partial struct L8 : IPixel<L8>, IPackedVector<byte>
             ColorNumerics.DownScaleFrom16BitTo8Bit(source.B));
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is L8 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is L8 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/La16.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -80,7 +79,7 @@ public partial struct La16 : IPixel<La16>, IPackedVector<ushort>
     public readonly bool Equals(La16 other) => this.PackedValue.Equals(other.PackedValue);
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is La16 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is La16 other && this.Equals(other);
 
     /// <inheritdoc />
     public override readonly string ToString() => $"La16({this.L}, {this.A})";

src/ImageSharp/PixelFormats/PixelImplementations/La32.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -82,7 +81,7 @@ public partial struct La32 : IPixel<La32>, IPackedVector<uint>
     public readonly bool Equals(La32 other) => this.PackedValue.Equals(other.PackedValue);
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is La32 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is La32 other && this.Equals(other);
 
     /// <inheritdoc />
     public override readonly string ToString() => $"La32({this.L}, {this.A})";

src/ImageSharp/PixelFormats/PixelImplementations/NormalizedByte2.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -162,7 +161,7 @@ public partial struct NormalizedByte2 : IPixel<NormalizedByte2>, IPackedVector<u
             (sbyte)((this.PackedValue >> 8) & 0xFF) / MaxPos);
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is NormalizedByte2 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is NormalizedByte2 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/NormalizedByte4.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -154,7 +153,7 @@ public partial struct NormalizedByte4 : IPixel<NormalizedByte4>, IPackedVector<u
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is NormalizedByte4 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is NormalizedByte4 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/NormalizedShort2.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -163,7 +162,7 @@ public partial struct NormalizedShort2 : IPixel<NormalizedShort2>, IPackedVector
             (short)(this.PackedValue >> 0x10) / MaxPos);
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is NormalizedShort2 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is NormalizedShort2 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/NormalizedShort4.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -155,7 +154,7 @@ public partial struct NormalizedShort4 : IPixel<NormalizedShort4>, IPackedVector
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is NormalizedShort4 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is NormalizedShort4 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Rg32.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -146,7 +145,7 @@ public partial struct Rg32 : IPixel<Rg32>, IPackedVector<uint>
     public readonly Vector2 ToVector2() => new Vector2(this.PackedValue & 0xFFFF, (this.PackedValue >> 16) & 0xFFFF) / Max;
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Rg32 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Rg32 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Rgb24.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -241,7 +240,7 @@ public partial struct Rgb24 : IPixel<Rgb24>
     }
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is Rgb24 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Rgb24 other && this.Equals(other);
 
     /// <inheritdoc/>
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Rgb48.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -210,7 +209,7 @@ public partial struct Rgb48 : IPixel<Rgb48>
     public void FromRgb48(Rgb48 source) => this = source;
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Rgb48 rgb48 && this.Equals(rgb48);
+    public override readonly bool Equals(object? obj) => obj is Rgb48 rgb48 && this.Equals(rgb48);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Rgba1010102.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -141,7 +140,7 @@ public partial struct Rgba1010102 : IPixel<Rgba1010102>, IPackedVector<uint>
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Rgba1010102 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Rgba1010102 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Rgba32.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Buffers.Binary;
 using System.Globalization;
@@ -267,7 +266,7 @@ public partial struct Rgba32 : IPixel<Rgba32>, IPackedVector<uint>
     /// The <see cref="bool"/>.
     /// </returns>
     [MethodImpl(InliningOptions.ShortMethod)]
-    public static bool TryParseHex(string hex, out Rgba32 result)
+    public static bool TryParseHex(string? hex, out Rgba32 result)
     {
         result = default;
         if (string.IsNullOrWhiteSpace(hex))
@@ -437,7 +436,7 @@ public partial struct Rgba32 : IPixel<Rgba32>, IPackedVector<uint>
     }
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is Rgba32 rgba32 && this.Equals(rgba32);
+    public override readonly bool Equals(object? obj) => obj is Rgba32 rgba32 && this.Equals(rgba32);
 
     /// <inheritdoc/>
     [MethodImpl(InliningOptions.ShortMethod)]
@@ -514,7 +513,7 @@ public partial struct Rgba32 : IPixel<Rgba32>, IPackedVector<uint>
     /// <returns>
     /// A rrggbbaa hex value.
     /// </returns>
-    private static string ToRgbaHex(string hex)
+    private static string? ToRgbaHex(string hex)
     {
         if (hex[0] == '#')
         {

src/ImageSharp/PixelFormats/PixelImplementations/Rgba64.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -444,7 +443,7 @@ public partial struct Rgba64 : IPixel<Rgba64>, IPackedVector<ulong>
     }
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Rgba64 rgba64 && this.Equals(rgba64);
+    public override readonly bool Equals(object? obj) => obj is Rgba64 rgba64 && this.Equals(rgba64);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/RgbaVector.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Globalization;
 using System.Numerics;
@@ -193,7 +192,7 @@ public partial struct RgbaVector : IPixel<RgbaVector>
     }
 
     /// <inheritdoc/>
-    public override readonly bool Equals(object obj) => obj is RgbaVector other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is RgbaVector other && this.Equals(other);
 
     /// <inheritdoc/>
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Short2.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -164,7 +163,7 @@ public partial struct Short2 : IPixel<Short2>, IPackedVector<uint>
     public readonly Vector2 ToVector2() => new((short)(this.PackedValue & 0xFFFF), (short)(this.PackedValue >> 0x10));
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Short2 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Short2 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/PixelFormats/PixelImplementations/Short4.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -164,7 +163,7 @@ public partial struct Short4 : IPixel<Short4>, IPackedVector<ulong>
     public void FromRgba64(Rgba64 source) => this.FromScaledVector4(source.ToScaledVector4());
 
     /// <inheritdoc />
-    public override readonly bool Equals(object obj) => obj is Short4 other && this.Equals(other);
+    public override readonly bool Equals(object? obj) => obj is Short4 other && this.Equals(other);
 
     /// <inheritdoc />
     [MethodImpl(InliningOptions.ShortMethod)]

src/ImageSharp/Processing/DefaultImageProcessorContext{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Collections.Concurrent;
 using SixLabors.ImageSharp.PixelFormats;
@@ -17,7 +16,7 @@ internal class DefaultImageProcessorContext<TPixel> : IInternalImageProcessingCo
 {
     private readonly bool mutate;
     private readonly Image<TPixel> source;
-    private Image<TPixel> destination;
+    private Image<TPixel>? destination;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="DefaultImageProcessorContext{TPixel}"/> class.
@@ -54,7 +53,7 @@ internal class DefaultImageProcessorContext<TPixel> : IInternalImageProcessingCo
             this.destination = this.source.Clone();
         }
 
-        return this.destination;
+        return this.destination!;
     }
 
     /// <inheritdoc/>
@@ -87,7 +86,7 @@ internal class DefaultImageProcessorContext<TPixel> : IInternalImageProcessingCo
         }
 
         // Standard processing pipeline.
-        using (IImageProcessor<TPixel> specificProcessor = processor.CreatePixelSpecificProcessor(this.Configuration, this.destination, rectangle))
+        using (IImageProcessor<TPixel> specificProcessor = processor.CreatePixelSpecificProcessor(this.Configuration, this.destination!, rectangle))
         {
             specificProcessor.Execute();
         }

src/ImageSharp/Processing/Processors/Convolution/KernelSamplingMap.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Buffers;
 using System.Runtime.CompilerServices;
@@ -16,8 +15,8 @@ internal sealed class KernelSamplingMap : IDisposable
 {
     private readonly MemoryAllocator allocator;
     private bool isDisposed;
-    private IMemoryOwner<int> yOffsets;
-    private IMemoryOwner<int> xOffsets;
+    private IMemoryOwner<int>? yOffsets;
+    private IMemoryOwner<int>? xOffsets;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="KernelSamplingMap"/> class.
@@ -65,10 +64,10 @@ internal sealed class KernelSamplingMap : IDisposable
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public Span<int> GetRowOffsetSpan() => this.yOffsets.GetSpan();
+    public Span<int> GetRowOffsetSpan() => this.yOffsets!.GetSpan();
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public Span<int> GetColumnOffsetSpan() => this.xOffsets.GetSpan();
+    public Span<int> GetColumnOffsetSpan() => this.xOffsets!.GetSpan();
 
     /// <inheritdoc/>
     public void Dispose()

src/ImageSharp/Processing/Processors/Drawing/DrawImageProcessor.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using SixLabors.ImageSharp.Advanced;
 using SixLabors.ImageSharp.PixelFormats;
@@ -65,7 +64,7 @@ public class DrawImageProcessor : IImageProcessor
     {
         ProcessorFactoryVisitor<TPixelBg> visitor = new(configuration, this, source, sourceRectangle);
         this.Image.AcceptVisitor(visitor);
-        return visitor.Result;
+        return visitor.Result!;
     }
 
     private class ProcessorFactoryVisitor<TPixelBg> : IImageVisitor
@@ -84,7 +83,7 @@ public class DrawImageProcessor : IImageProcessor
             this.sourceRectangle = sourceRectangle;
         }
 
-        public IImageProcessor<TPixelBg> Result { get; private set; }
+        public IImageProcessor<TPixelBg>? Result { get; private set; }
 
         public void Visit<TPixelFg>(Image<TPixelFg> image)
             where TPixelFg : unmanaged, IPixel<TPixelFg>

src/ImageSharp/Processing/Processors/Quantization/OctreeQuantizer{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Buffers;
 using System.Diagnostics.CodeAnalysis;
@@ -29,7 +28,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
     private readonly Octree octree;
     private IMemoryOwner<TPixel> paletteOwner;
     private ReadOnlyMemory<TPixel> palette;
-    private EuclideanPixelMap<TPixel> pixelMap;
+    private EuclideanPixelMap<TPixel>? pixelMap;
     private readonly bool isDithering;
     private bool isDisposed;
 
@@ -143,7 +142,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
         // pixel and a black one.
         if (this.isDithering || color.Equals(default))
         {
-            return (byte)this.pixelMap.GetClosestColor(color, out match);
+            return (byte)this.pixelMap!.GetClosestColor(color, out match);
         }
 
         ref TPixel paletteRef = ref MemoryMarshal.GetReference(this.palette.Span);
@@ -158,8 +157,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
         if (!this.isDisposed)
         {
             this.isDisposed = true;
-            this.paletteOwner?.Dispose();
-            this.paletteOwner = null;
+            this.paletteOwner.Dispose();
             this.pixelMap?.Dispose();
             this.pixelMap = null;
         }
@@ -183,7 +181,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
         /// <summary>
         /// Store the last node quantized
         /// </summary>
-        private OctreeNode previousNode;
+        private OctreeNode? previousNode;
 
         /// <summary>
         /// Cache the previous color quantized
@@ -221,7 +219,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
         /// <summary>
         /// Gets the array of reducible nodes
         /// </summary>
-        private OctreeNode[] ReducibleNodes
+        private OctreeNode?[] ReducibleNodes
         {
             [MethodImpl(InliningOptions.ShortMethod)]
             get;
@@ -311,7 +309,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
             }
 
             // Reduce the node most recently added to the list at level 'index'
-            OctreeNode node = this.ReducibleNodes[index];
+            OctreeNode node = this.ReducibleNodes[index]!;
             this.ReducibleNodes[index] = node.NextReducible;
 
             // Decrement the leaf count after reducing the node
@@ -330,7 +328,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
             /// <summary>
             /// Pointers to any child nodes
             /// </summary>
-            private readonly OctreeNode[] children;
+            private readonly OctreeNode?[]? children;
 
             /// <summary>
             /// Flag indicating that this is a leaf node
@@ -395,7 +393,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
             /// <summary>
             /// Gets the next reducible node
             /// </summary>
-            public OctreeNode NextReducible
+            public OctreeNode? NextReducible
             {
                 [MethodImpl(InliningOptions.ShortMethod)]
                 get;
@@ -423,7 +421,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
                     // Go to the next level down in the tree
                     int index = GetColorIndex(ref color, level);
 
-                    OctreeNode child = this.children[index];
+                    OctreeNode? child = this.children![index];
                     if (child is null)
                     {
                         // Create a new child node and store it in the array
@@ -448,7 +446,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
                 // Loop through all children and add their information to this node
                 for (int index = 0; index < 8; index++)
                 {
-                    OctreeNode child = this.children[index];
+                    OctreeNode? child = this.children![index];
                     if (child != null)
                     {
                         this.red += child.red;
@@ -495,7 +493,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
                     // Loop through children looking for leaves
                     for (int i = 0; i < 8; i++)
                     {
-                        this.children[i]?.ConstructPalette(palette, ref index);
+                        this.children![i]?.ConstructPalette(palette, ref index);
                     }
                 }
             }
@@ -517,7 +515,7 @@ public struct OctreeQuantizer<TPixel> : IQuantizer<TPixel>
                 }
 
                 int colorIndex = GetColorIndex(ref pixel, level);
-                OctreeNode child = this.children[colorIndex];
+                OctreeNode? child = this.children![colorIndex];
 
                 int index = 0;
                 if (child != null)

src/ImageSharp/Processing/Processors/Quantization/PaletteQuantizer{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
@@ -68,7 +67,6 @@ internal struct PaletteQuantizer<TPixel> : IQuantizer<TPixel>
     /// <inheritdoc/>
     public void Dispose()
     {
-        this.pixelMap?.Dispose();
-        this.pixelMap = null;
+        this.pixelMap.Dispose();
     }
 }

src/ImageSharp/Processing/Processors/Quantization/QuantizerOptions.cs

@@ -17,7 +17,7 @@ public class QuantizerOptions
     /// Gets or sets the  algorithm to apply to the output image.
     /// Defaults to <see cref="QuantizerConstants.DefaultDither"/>; set to <see langword="null"/> for no dithering.
     /// </summary>
-    public IDither Dither { get; set; } = QuantizerConstants.DefaultDither;
+    public IDither? Dither { get; set; } = QuantizerConstants.DefaultDither;
 
     /// <summary>
     /// Gets or sets the dithering scale used to adjust the amount of dither. Range 0..1.

src/ImageSharp/Processing/Processors/Quantization/QuantizerUtilities.cs

@@ -146,7 +146,7 @@ public static class QuantizerUtilities
         where TFrameQuantizer : struct, IQuantizer<TPixel>
         where TPixel : unmanaged, IPixel<TPixel>
     {
-        IDither dither = quantizer.Options.Dither;
+        IDither? dither = quantizer.Options.Dither;
         Buffer2D<TPixel> sourceBuffer = source.PixelBuffer;
 
         if (dither is null)

src/ImageSharp/Processing/Processors/Quantization/WuQuantizer{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Buffers;
 using System.Diagnostics.CodeAnalysis;
@@ -76,7 +75,7 @@ internal struct WuQuantizer<TPixel> : IQuantizer<TPixel>
     private ReadOnlyMemory<TPixel> palette;
     private int maxColors;
     private readonly Box[] colorCube;
-    private EuclideanPixelMap<TPixel> pixelMap;
+    private EuclideanPixelMap<TPixel>? pixelMap;
     private readonly bool isDithering;
     private bool isDisposed;
 
@@ -175,7 +174,7 @@ internal struct WuQuantizer<TPixel> : IQuantizer<TPixel>
     {
         if (this.isDithering)
         {
-            return (byte)this.pixelMap.GetClosestColor(color, out match);
+            return (byte)this.pixelMap!.GetClosestColor(color, out match);
         }
 
         Rgba32 rgba = default;
@@ -203,9 +202,6 @@ internal struct WuQuantizer<TPixel> : IQuantizer<TPixel>
             this.momentsOwner?.Dispose();
             this.tagsOwner?.Dispose();
             this.paletteOwner?.Dispose();
-            this.momentsOwner = null;
-            this.tagsOwner = null;
-            this.paletteOwner = null;
             this.pixelMap?.Dispose();
             this.pixelMap = null;
         }
@@ -869,7 +865,7 @@ internal struct WuQuantizer<TPixel> : IQuantizer<TPixel>
         public int Volume;
 
         /// <inheritdoc/>
-        public override readonly bool Equals(object obj)
+        public override readonly bool Equals(object? obj)
             => obj is Box box
             && this.Equals(box);
 

src/ImageSharp/Processing/Processors/Transforms/Linear/AffineTransformProcessor{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -20,8 +19,8 @@ internal class AffineTransformProcessor<TPixel> : TransformProcessor<TPixel>, IR
     private readonly Size destinationSize;
     private readonly Matrix3x2 transformMatrix;
     private readonly IResampler resampler;
-    private ImageFrame<TPixel> source;
-    private ImageFrame<TPixel> destination;
+    private ImageFrame<TPixel>? source;
+    private ImageFrame<TPixel>? destination;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="AffineTransformProcessor{TPixel}"/> class.
@@ -53,8 +52,8 @@ internal class AffineTransformProcessor<TPixel> : TransformProcessor<TPixel>, IR
         where TResampler : struct, IResampler
     {
         Configuration configuration = this.Configuration;
-        ImageFrame<TPixel> source = this.source;
-        ImageFrame<TPixel> destination = this.destination;
+        ImageFrame<TPixel> source = this.source!;
+        ImageFrame<TPixel> destination = this.destination!;
         Matrix3x2 matrix = this.transformMatrix;
 
         // Handle transforms that result in output identical to the original.

src/ImageSharp/Processing/Processors/Transforms/Linear/ProjectiveTransformProcessor{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -20,8 +19,8 @@ internal class ProjectiveTransformProcessor<TPixel> : TransformProcessor<TPixel>
     private readonly Size destinationSize;
     private readonly IResampler resampler;
     private readonly Matrix4x4 transformMatrix;
-    private ImageFrame<TPixel> source;
-    private ImageFrame<TPixel> destination;
+    private ImageFrame<TPixel>? source;
+    private ImageFrame<TPixel>? destination;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="ProjectiveTransformProcessor{TPixel}"/> class.
@@ -53,8 +52,8 @@ internal class ProjectiveTransformProcessor<TPixel> : TransformProcessor<TPixel>
         where TResampler : struct, IResampler
     {
         Configuration configuration = this.Configuration;
-        ImageFrame<TPixel> source = this.source;
-        ImageFrame<TPixel> destination = this.destination;
+        ImageFrame<TPixel> source = this.source!;
+        ImageFrame<TPixel> destination = this.destination!;
         Matrix4x4 matrix = this.transformMatrix;
 
         // Handle transforms that result in output identical to the original.

src/ImageSharp/Processing/Processors/Transforms/Resize/ResizeProcessor{TPixel}.cs

@@ -1,6 +1,5 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
-#nullable disable
 
 using System.Runtime.CompilerServices;
 using SixLabors.ImageSharp.Advanced;
@@ -21,7 +20,7 @@ internal class ResizeProcessor<TPixel> : TransformProcessor<TPixel>, IResampling
     private readonly int destinationHeight;
     private readonly IResampler resampler;
     private readonly Rectangle destinationRectangle;
-    private Image<TPixel> destination;
+    private Image<TPixel>? destination;
 
     public ResizeProcessor(Configuration configuration, ResizeProcessor definition, Image<TPixel> source, Rectangle sourceRectangle)
         : base(configuration, source, sourceRectangle)
@@ -56,7 +55,7 @@ internal class ResizeProcessor<TPixel> : TransformProcessor<TPixel>, IResampling
     {
         Configuration configuration = this.Configuration;
         Image<TPixel> source = this.Source;
-        Image<TPixel> destination = this.destination;
+        Image<TPixel> destination = this.destination!;
         Rectangle sourceRectangle = this.SourceRectangle;
         Rectangle destinationRectangle = this.destinationRectangle;
         bool compand = this.options.Compand;