From 37b49851335e9df91de7cdf763d27768c85c69e3 Mon Sep 17 00:00:00 2001
From: Cristy <mikayla-grace@urban-warrior.org>
Date: Thu, 12 Aug 2021 12:02:02 -0400
Subject: [PATCH] https://github.com/ImageMagick/ImageMagick/issues/4059

---
 magick/attribute.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/magick/attribute.c b/magick/attribute.c
index 344835ec01..4c0c05e964 100644
--- 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;
     }