From 1de8ba2cee7d572d03f40553a18145e275d2c451 Mon Sep 17 00:00:00 2001
From: dirk <dirk@git.imagemagick.org>
Date: Fri, 19 Sep 2014 21:01:48 +0000
Subject: [PATCH] Added missing call to GetPixelReadMask in SetImageAlpha.

---
 MagickCore/image.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/MagickCore/image.c b/MagickCore/image.c
index 05e650516..5193e37df 100644
--- a/MagickCore/image.c
+++ b/MagickCore/image.c
@@ -2883,7 +2883,8 @@ MagickExport MagickBooleanType SetImageAlpha(Image *image,const Quantum alpha,
       }
     for (x=0; x < (ssize_t) image->columns; x++)
     {
-      SetPixelAlpha(image,alpha,q);
+      if (GetPixelReadMask(image,q) == 0)
+        SetPixelAlpha(image,alpha,q);
       q+=GetPixelChannels(image);
     }
     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
-- 
2.40.0