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diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index ce837f55142bc1f9adb85b56d70f437429b2afa9..c51c6f917fa62591f58bc199ff6388dedf9d2f74 100644 (file)
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -3122,8 +3122,8 @@ MagickExport Image *SharpenImage(const Image *image,const double radius,
   (void) ResetMagickMemory(kernel_info,0,sizeof(*kernel_info));
   kernel_info->width=width;
   kernel_info->height=width;
-  kernel_info->x=(ssize_t) width/2;
-  kernel_info->y=(ssize_t) width/2;
+  kernel_info->x=(ssize_t) (width-1)/2;
+  kernel_info->y=(ssize_t) (width-1)/2;
   kernel_info->signature=MagickSignature;
   kernel_info->values=(MagickRealType *) MagickAssumeAligned(
     AcquireAlignedMemory(kernel_info->width,kernel_info->width*