(PECL imagick 2, PECL imagick 3)
Imagick::spreadImage — Randomly displaces each pixel in a block
public Imagick::spreadImage ( float $radius ) : bool
Special effects method that randomly displaces each pixel in a block defined by the radius parameter.
radius
 Returns true on success. 
Throws ImagickException on error.
Example #1 Imagick::spreadImage()
<?php
function spreadImage($imagePath, $radius) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->spreadImage($radius);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?> 
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    https://www.php.net/manual/en/imagick.spreadimage.php