Merge pull request #2819 from mistoll/bmp_dither

Fix using dither in BmpEncoder when bit per pixel is <= 4
SixLabors · Oct 12, 2024 · ed2c2a1 · ed2c2a1
2 parents 0919534 + bfbade1
commit ed2c2a1
Showing 1 changed file with 9 additions and 3 deletions.
diff --git a/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs b/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs
@@ -575,7 +575,9 @@ private void Write4BitPixelData<TPixel>(Configuration configuration, Stream stre
     {
         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 @@ private void Write2BitPixelData<TPixel>(Configuration configuration, Stream stre
     {
         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 @@ private void Write1BitPixelData<TPixel>(Configuration configuration, Stream stre
     {
         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);