Do not use static default options

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

@@ -11,14 +11,12 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
     /// </summary>
     public class OctreeQuantizer : IQuantizer
     {
-        private static readonly QuantizerOptions DefaultOptions = new QuantizerOptions();
-
         /// <summary>
         /// Initializes a new instance of the <see cref="OctreeQuantizer"/> class
         /// using the default <see cref="QuantizerOptions"/>.
         /// </summary>
         public OctreeQuantizer()
-            : this(DefaultOptions)
+            : this(new QuantizerOptions())
         {
         }
 

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

@@ -11,7 +11,6 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
     /// </summary>
     public class PaletteQuantizer : IQuantizer
     {
-        private static readonly QuantizerOptions DefaultOptions = new QuantizerOptions();
         private readonly ReadOnlyMemory<Color> colorPalette;
 
         /// <summary>
@@ -19,7 +18,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
         /// </summary>
         /// <param name="palette">The color palette.</param>
         public PaletteQuantizer(ReadOnlyMemory<Color> palette)
-            : this(palette, DefaultOptions)
+            : this(palette, new QuantizerOptions())
         {
         }
 

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

@@ -1,8 +1,6 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.Processing.Processors.Dithering;
-
 namespace SixLabors.ImageSharp.Processing.Processors.Quantization
 {
     /// <summary>
@@ -10,13 +8,11 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
     /// </summary>
     public class WebSafePaletteQuantizer : PaletteQuantizer
     {
-        private static readonly QuantizerOptions DefaultOptions = new QuantizerOptions();
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WebSafePaletteQuantizer" /> class.
         /// </summary>
         public WebSafePaletteQuantizer()
-            : this(DefaultOptions)
+            : this(new QuantizerOptions())
         {
         }
 

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

@@ -9,13 +9,11 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
     /// </summary>
     public class WernerPaletteQuantizer : PaletteQuantizer
     {
-        private static readonly QuantizerOptions DefaultOptions = new QuantizerOptions();
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WernerPaletteQuantizer" /> class.
         /// </summary>
         public WernerPaletteQuantizer()
-            : this(DefaultOptions)
+            : this(new QuantizerOptions())
         {
         }
 

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

@@ -10,14 +10,12 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
     /// </summary>
     public class WuQuantizer : IQuantizer
     {
-        private static readonly QuantizerOptions DefaultOptions = new QuantizerOptions();
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WuQuantizer"/> class
         /// using the default <see cref="QuantizerOptions"/>.
         /// </summary>
         public WuQuantizer()
-            : this(DefaultOptions)
+            : this(new QuantizerOptions())
         {
         }