(no commit message)

diff --git a/MagickCore/threshold.c b/MagickCore/threshold.c
index cb313b2018c04884fac801ee2270d40f898ba61d..6480605df70c37cb595b63e1d681e26e0ed5b3e5 100644 (file)
--- a/MagickCore/threshold.c
+++ b/MagickCore/threshold.c
@@ -401,6 +401,8 @@ 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)
+    (void) TransformImageColorspace(image,RGBColorspace,exception);
   /*
     Bilevel threshold image.
   */