https://github.com/ImageMagick/ImageMagick/issues/4059

ImageMagick · Aug 12, 2021 · 37b4985 · 37b4985
1 parent 63037e7
commit 37b4985
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/magick/attribute.c b/magick/attribute.c
@@ -1577,6 +1577,11 @@ MagickExport MagickBooleanType SetImageType(Image *image,const ImageType type)
       status=TransformImageColorspace(image,GRAYColorspace);
       (void) NormalizeImage(image);
       status=BilevelImage(image,QuantumRange/2.0);
+      quantize_info=AcquireQuantizeInfo(image_info);
+      quantize_info->number_colors=2;
+      quantize_info->colorspace=GRAYColorspace;
+      status=QuantizeImage(quantize_info,image);
+      quantize_info=DestroyQuantizeInfo(quantize_info);
       image->matte=MagickFalse;
       break;
     }