diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index 8b84b91..52f5824 100644
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -1421,10 +1421,10 @@
{
alpha=(MagickRealType) (QuantumScale*GetPixelAlpha(image,
kernel_pixels+u*channels));
- if ((traits & BlendPixelTrait) != 0)
- pixel+=(*k)*alpha*kernel_pixels[u*channels+i];
- else
+ if ((traits & BlendPixelTrait) == 0)
pixel+=(*k)*kernel_pixels[u*channels+i];
+ else
+ pixel+=(*k)*alpha*kernel_pixels[u*channels+i];
gamma+=(*k)*alpha;
k++;
}