commit a4a3658f96c593ae67d65c63bc5970bce5854920
author Cristy <urban-warrior@imagemagick.org> Sat Dec 19 17:58:20 2015 -0500
committer Cristy <urban-warrior@imagemagick.org> Sat Dec 19 17:58:20 2015 -0500
tree d1b94dc7d42a7362432aaa1d4efa274ae0f2c1b8
parent 1ca877c27bc1cab1f355b2bf67dffafa97cfc396

Only set alpha channel if the remove list is valid

MagickCore/vision.c

diff --git a/MagickCore/vision.c b/MagickCore/vision.c
index aca2dc7..4b03364 100644
--- a/MagickCore/vision.c
+++ b/MagickCore/vision.c
@@ -581,9 +581,11 @@
             if (last < 0)
               last+=(long) component_image->colors;
           }
-        component_image->alpha_trait=BlendPixelTrait;
         for (step=first > last ? -1 : 1; first != (last+step); first+=step)
+        {
+          component_image->alpha_trait=BlendPixelTrait;
           component_image->colormap[first].alpha=TransparentAlpha;
+        }
       }
     }
   (void) SyncImage(component_image,exception);