commit a59574ad7fed078997b75f2b4b5d60596aff21c3
author Cristy <urban-warrior@imagemagick.org> Fri Mar 02 20:26:16 2018 -0500
committer Cristy <urban-warrior@imagemagick.org> Fri Mar 02 20:26:16 2018 -0500
tree 50214aed81ff1d32027de98821044166225ca6a4
parent 470e71c028553102b5c1387ec1849ea6500ca735

Return pseudo-class image for -type bilevel option

MagickCore/quantize.c

diff --git a/MagickCore/quantize.c b/MagickCore/quantize.c
index 5c3a4be..a9037af 100644
--- a/MagickCore/quantize.c
+++ b/MagickCore/quantize.c
@@ -668,7 +668,8 @@
         }
     }
   (void) SyncImage(image,exception);
-  if (cube_info->quantize_info->colorspace != UndefinedColorspace)
+  if ((cube_info->quantize_info->colorspace != UndefinedColorspace) &&
+      (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse))
     (void) TransformImageColorspace(image,colorspace,exception);
   return(MagickTrue);
 }