From 313b4d277c1c2e173ff615c0719c23ed3a192ce1 Mon Sep 17 00:00:00 2001
From: mistoll <unwichtig2@mistoll.de>
Date: Tue, 1 Oct 2024 14:55:31 +0200
Subject: [PATCH] Fix using dither in BmpEncoder when bit per pixel is <= 4

---
 src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs b/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs
index 85786949d8..7c92d3e463 100644
--- a/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs
+++ b/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs
@@ -575,7 +575,9 @@ internal sealed class BmpEncoderCore
     {
         using IQuantizer<TPixel> frameQuantizer = this.quantizer.CreatePixelSpecificQuantizer<TPixel>(configuration, new QuantizerOptions()
         {
-            MaxColors = 16
+            MaxColors = 16,
+            Dither = this.quantizer.Options.Dither,
+            DitherScale = this.quantizer.Options.DitherScale
         });
 
         frameQuantizer.BuildPalette(this.pixelSamplingStrategy, image);
@@ -623,7 +625,9 @@ internal sealed class BmpEncoderCore
     {
         using IQuantizer<TPixel> frameQuantizer = this.quantizer.CreatePixelSpecificQuantizer<TPixel>(configuration, new QuantizerOptions()
         {
-            MaxColors = 4
+            MaxColors = 4,
+            Dither = this.quantizer.Options.Dither,
+            DitherScale = this.quantizer.Options.DitherScale
         });
 
         frameQuantizer.BuildPalette(this.pixelSamplingStrategy, image);
@@ -680,7 +684,9 @@ internal sealed class BmpEncoderCore
     {
         using IQuantizer<TPixel> frameQuantizer = this.quantizer.CreatePixelSpecificQuantizer<TPixel>(configuration, new QuantizerOptions()
         {
-            MaxColors = 2
+            MaxColors = 2,
+            Dither = this.quantizer.Options.Dither,
+            DitherScale = this.quantizer.Options.DitherScale
         });
 
         frameQuantizer.BuildPalette(this.pixelSamplingStrategy, image);