(PECL imagick 2, PECL imagick 3)
Imagick::blurImage — Adds blur filter to image
public Imagick::blurImage ( float $radius , float $sigma [, int $channel ] ) : bool
Adds blur filter to image. Optional third parameter to blur a specific channel.
radius
Blur radius
sigma
Standard deviation
channel
The 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;
?>
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https://www.php.net/manual/en/imagick.blurimage.php