From 3e46822d457ca40a57468e3c0f3829a911026c28 Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Sun, 12 Aug 2018 20:35:57 +0200
Subject: [PATCH] SyncNextImageInList will only copy the compression to the
 next image when those values are undefined.

---
 MagickCore/list.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/MagickCore/list.c b/MagickCore/list.c
index f24be153b..cf773e865 100644
--- a/MagickCore/list.c
+++ b/MagickCore/list.c
@@ -1457,7 +1457,9 @@ MagickExport Image *SyncNextImageInList(const Image *images)
       DestroyBlob(images->next);
       images->next->blob=ReferenceBlob(images->blob);
     }
-  images->next->compression=images->compression;
-  images->next->endian=images->endian;
+  if (images->next->compression == UndefinedCompression)
+    images->next->compression=images->compression;
+  if (images->next->endian == UndefinedEndian)
+    images->next->endian=images->endian;
   return(images->next);
 }
-- 
2.40.0