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(PECL imagick 2.0.0)
Imagick::edgeImage — Enhance edges within the image
$radius 
   )Enhance edges within the image with a convolution filter of the given radius. Use radius 0 and it will be auto-selected.
radius The radius of the operation.
   成功时返回  TRUE 。
  
错误时抛出 ImagickException。
Example #1 Imagick::edgeImage()
  <?php
 function  edgeImage ( $imagePath ,  $radius ) {
     $imagick  = new \ Imagick ( realpath ( $imagePath ));
     $imagick -> edgeImage ( $radius );
     header ( "Content-Type: image/jpg" );
    echo  $imagick -> getImageBlob ();
}
 ?>