From 98f7b8da26cd7350ed305566264f5584ba84e94f Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Thu, 24 Aug 2017 19:36:19 -0400
Subject: [PATCH] ...

---
 MagickCore/channel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/MagickCore/channel.c b/MagickCore/channel.c
index 07c15d613..c68b30568 100644
--- a/MagickCore/channel.c
+++ b/MagickCore/channel.c
@@ -733,6 +733,10 @@ MagickExport Image *SeparateImage(const Image *image,
     }
   separate_image->alpha_trait=UndefinedPixelTrait;
   (void) SetImageColorspace(separate_image,GRAYColorspace,exception);
+  if ((IsRGBColorspace(image->colorspace) != MagickFalse) ||
+      (image->colorspace == XYZColorspace) ||
+      (image->colorspace == xyYColorspace))
+    image->gamma=1.000;
   /*
     Separate image.
   */
-- 
2.40.0