Reduce memory usage in pixel map

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

@@ -184,14 +184,14 @@ internal sealed class EuclideanPixelMap<TPixel> : IDisposable
     /// The granularity of the cache has been determined based upon the current
     /// suite of test images and provides the lowest possible memory usage while
     /// providing enough match accuracy.
-    /// Entry count is currently limited to 4601025 entries (8MB).
+    /// Entry count is currently limited to 2335905 entries (4MB).
     /// </para>
     /// </remarks>
     private unsafe struct ColorDistanceCache : IDisposable
     {
         private const int IndexRBits = 5;
         private const int IndexGBits = 5;
-        private const int IndexBBits = 6;
+        private const int IndexBBits = 5;
         private const int IndexABits = 6;
         private const int IndexRCount = (1 << IndexRBits) + 1;
         private const int IndexGCount = (1 << IndexGBits) + 1;

tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs

@@ -499,7 +499,7 @@ public partial class PngEncoderTests
         // TODO: Find a better way to compare.
         // The image has been visually checked but the quantization pattern used in the png encoder
         // means we cannot use an exact comparison nor replicate using the quantizing processor.
-        ImageComparer.TolerantPercentage(0.12f).VerifySimilarity(output, image);
+        ImageComparer.TolerantPercentage(0.46f).VerifySimilarity(output, image);
 
         GifMetadata gif = image.Metadata.GetGifMetadata();
         PngMetadata png = output.Metadata.GetPngMetadata();

tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithOctreeQuantizer_rgb32.bmp

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tests/Images/External/ReferenceOutput/BmpEncoderTests/Encode_8BitColor_WithWuQuantizer_rgb32.bmp

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tests/Images/External/ReferenceOutput/DitherTests/ApplyDiffusionFilterInBox_Rgba32_CalliphoraPartial.png

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tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_ShouldNotDependOnSinglePixelType_Rgb24_filter0.png

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tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_Bike_Atkinson.png

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