(PECL imagick 2.0.0)
Imagick::shaveImage — Shaves pixels from the image edges
$columns
   , int $rows
   )Shaves pixels from the image edges. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.
columns
rows
   Returns TRUE on success.
  
Example #1 Imagick::shaveImage()
<?php
function shaveImage($imagePath) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->shaveImage(100, 50);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?>