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diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index 7d4d146e05a62ab51fa03d13749b981f4ef906c2..4a61a4fa1e7f153377074ef574c6124cfee1424b 100644 (file)
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -1130,8 +1130,8 @@ MagickExport Image *CannyEdgeImage(const Image *image,const double radius,
             intensity;
 
           intensity=GetPixelIntensity(edge_image,kernel_pixels+u);
-          dx+=0.5*Gx[v][u]*intensity;
-          dy+=0.5*Gy[v][u]*intensity;
+          dx+=1.5*Gx[v][u]*intensity;
+          dy+=1.5*Gy[v][u]*intensity;
         }
         kernel_pixels+=edge_image->columns+1;
       }