(no commit message)

diff --git a/MagickCore/channel.c b/MagickCore/channel.c
index 5a5c68077a288f8a30c20f5eaa5e88ac4b2229f7..c64b3561ccc5d4f6043404e976c262880ea79647 100644 (file)
--- a/MagickCore/channel.c
+++ b/MagickCore/channel.c
@@ -1155,7 +1155,8 @@ MagickExport MagickBooleanType SetImageAlphaChannel(Image *image,
     }
     case OnAlphaChannel:
     {
-      status=SetImageAlpha(image,OpaqueAlpha,exception);
+      if (image->alpha_trait == UndefinedPixelTrait)
+        status=SetImageAlpha(image,OpaqueAlpha,exception);
       image->alpha_trait=BlendPixelTrait;
       break;
     }