From: Cristy <urban-warrior@imagemagick.org>
Date: Tue, 9 May 2017 00:02:18 +0000 (-0400)
Subject: https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31879
X-Git-Tag: 7.0.5-6~9
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5239ac04c96414fa0df825af14bf2378ee0c4a6e;p=imagemagick

https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31879
---

diff --git a/MagickCore/channel.c b/MagickCore/channel.c
index 7bf76ba1d..4792927ed 100644
--- a/MagickCore/channel.c
+++ b/MagickCore/channel.c
@@ -1259,6 +1259,9 @@ MagickExport MagickBooleanType SetImageAlphaChannel(Image *image,
       /*
         Set alpha channel by shape.
       */
+      status=SetImageStorageClass(image,DirectClass,exception);
+      if (status == MagickFalse)
+        break;
       image->alpha_trait=UpdatePixelTrait;
       (void) SetImageMask(image,WritePixelMask,image,exception);
       (void) LevelImageColors(image,&image->background_color,