diff --git a/IMPLEMENTATION.md b/IMPLEMENTATION.md
index b6b3a56..9c25633 100644
--- a/IMPLEMENTATION.md
+++ b/IMPLEMENTATION.md
@@ -100,7 +100,7 @@ Each type lives in `src/FrameProcessor/Domain/`. Tests in `tests/FrameProcessor.
 - `static ReadOnlyMemory<Color> BuildDisplay(IReadOnlyList<PaletteEntry>)` and `BuildDevice(...)`.
 - **Tests:** `PaletteFactoryTests` — count, ordering preserved.
 
-### [ ] 3.2 `DitheringRegistry`
+### [x] 3.2 `DitheringRegistry`
 - `IReadOnlyDictionary<DitherAlgorithm, IDither>` mapping each enum to the corresponding ImageSharp `KnownDitherings.*`.
 
 ### [ ] 3.3 `IImagePipeline` + `ImagePipeline`
diff --git a/src/FrameProcessor/ImagePipeline/DitheringRegistry.cs b/src/FrameProcessor/ImagePipeline/DitheringRegistry.cs
new file mode 100644
index 0000000..879ff6a
--- /dev/null
+++ b/src/FrameProcessor/ImagePipeline/DitheringRegistry.cs
@@ -0,0 +1,21 @@
+using FrameProcessor.Domain;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Processing.Processors.Dithering;
+
+namespace FrameProcessor.ImagePipeline;
+
+/// <summary>
+/// Maps each <see cref="DitherAlgorithm"/> to the corresponding ImageSharp <see cref="IDither"/>
+/// instance from <see cref="KnownDitherings"/>.
+/// </summary>
+public static class DitheringRegistry
+{
+    public static IReadOnlyDictionary<DitherAlgorithm, IDither> All { get; } =
+        new Dictionary<DitherAlgorithm, IDither>
+        {
+            [DitherAlgorithm.FloydSteinberg] = KnownDitherings.FloydSteinberg,
+            [DitherAlgorithm.Atkinson] = KnownDitherings.Atkinson,
+            [DitherAlgorithm.Stucki] = KnownDitherings.Stucki,
+            [DitherAlgorithm.Jarvis] = KnownDitherings.JarvisJudiceNinke,
+        };
+}