https://github.com/ImageMagick/ImageMagick/issues/1683

diff --git a/MagickCore/threshold.c b/MagickCore/threshold.c
index c315c4a1424d50d0fdec21944a0fbcb9c59a997d..6c31f8f508184790c421f23bc55b747818858e9f 100644 (file)
--- a/MagickCore/threshold.c
+++ b/MagickCore/threshold.c
@@ -820,7 +820,7 @@ MagickExport MagickBooleanType BilevelImage(Image *image,const double threshold,
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
   if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse)
     return(MagickFalse);
-  if (IsGrayColorspace(image->colorspace) != MagickFalse)
+  if (IsGrayColorspace(image->colorspace) == MagickFalse)
     (void) SetImageColorspace(image,sRGBColorspace,exception);
   /*
     Bilevel threshold image.