MagickCore/effect.c

diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index 6ec08f3..fc7e0ae 100644
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -1206,14 +1206,17 @@
 MagickExport Image *EdgeImage(const Image *image,const double radius,
   ExceptionInfo *exception)
 {
-  char
-    geometry[MaxTextExtent];
+  Image
+    *edge_image;
 
   KernelInfo
     *kernel_info;
 
-  Image
-    *edge_image;
+  register ssize_t
+    i;
+
+  size_t
+    width;
 
   assert(image != (const Image *) NULL);
   assert(image->signature == MagickSignature);
@@ -1221,11 +1224,28 @@
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
   assert(exception != (ExceptionInfo *) NULL);
   assert(exception->signature == MagickSignature);
-  (void) FormatLocaleString(geometry,MaxTextExtent,"square:%.20g",radius);
-  kernel_info=AcquireKernelInfo(geometry);
+  width=GetOptimalKernelWidth1D(radius,0.5);
+  kernel_info=AcquireKernelInfo((const char *) NULL);
   if (kernel_info == (KernelInfo *) NULL)
     ThrowImageException(ResourceLimitError,"MemoryAllocationFailed");
-  edge_image=MorphologyApply(image,EdgeInMorphology,1,kernel_info,
+  (void) ResetMagickMemory(kernel_info,0,sizeof(*kernel_info));
+  kernel_info->width=width;
+  kernel_info->height=width;
+  kernel_info->x=(ssize_t) (kernel_info->width-1)/2;
+  kernel_info->y=(ssize_t) (kernel_info->height-1)/2;
+  kernel_info->signature=MagickSignature;
+  kernel_info->values=(MagickRealType *) MagickAssumeAligned(
+    AcquireAlignedMemory(kernel_info->width,kernel_info->height*
+    sizeof(*kernel_info->values)));
+  if (kernel_info->values == (MagickRealType *) NULL)
+    {
+      kernel_info=DestroyKernelInfo(kernel_info);
+      ThrowImageException(ResourceLimitError,"MemoryAllocationFailed");
+    }
+  for (i=0; i < (ssize_t) (kernel_info->width*kernel_info->height); i++)
+    kernel_info->values[i]=(-1.0);
+  kernel_info->values[i/2]=(double) kernel_info->width*kernel_info->height-1.0;
+  edge_image=MorphologyApply(image,ConvolveMorphology,1,kernel_info,
     UndefinedCompositeOp,0.0,exception);
   kernel_info=DestroyKernelInfo(kernel_info);
   return(edge_image);