(PECL imagick 2.0.0)
Imagick::blurImage — Adds blur filter to image
$radius
   , float $sigma
   [, int $channel
  ] )Adds blur filter to image. Optional third parameter to blur a specific channel.
radiusBlur radius
sigmaStandard deviation
channelThe Channeltype constant. When not supplied, all channels are blurred.
   Returns TRUE on success.
  
Throws ImagickException on error.
Example #1 Using Imagick::blurImage():
Blur an image, then display to the browser.
<?php
header('Content-type: image/jpeg');
$image = new Imagick('test.jpg');
$image->blurImage(5,3);
echo $image;
?>