Setting alpha_trait on background colors.

diff --git a/MagickCore/layer.c b/MagickCore/layer.c
index a6df0e8a2693864bd7931a62fdf1bfe70219dd88..b93b067392892a57e664a5e31737617c632836e7 100644 (file)
--- a/MagickCore/layer.c
+++ b/MagickCore/layer.c
@@ -1003,7 +1003,7 @@ static Image *OptimizeLayerFrames(const Image *image,
   prev_image->page.x=0;
   prev_image->page.y=0;
   prev_image->dispose=NoneDispose;
-
+  prev_image->background_color.alpha_trait=BlendPixelTrait;
   prev_image->background_color.alpha=(Quantum) TransparentAlpha;
   (void) SetImageBackgroundColor(prev_image,exception);
   /*
@@ -1488,6 +1488,7 @@ MagickExport void OptimizeImageTransparency(const Image *image,
   dispose_image->page.x=0;
   dispose_image->page.y=0;
   dispose_image->dispose=NoneDispose;
+  dispose_image->background_color.alpha_trait=BlendPixelTrait;
   dispose_image->background_color.alpha=(Quantum) TransparentAlpha;
   (void) SetImageBackgroundColor(dispose_image,exception);