(PECL imagick 2, PECL imagick 3)
Imagick::shaveImage — Shaves pixels from the image edges
public Imagick::shaveImage ( int $columns , int $rows ) : bool
Shaves pixels from the image edges. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.
columns
rows
 Returns true on success. 
Example #1 Imagick::shaveImage()
<?php
function shaveImage($imagePath) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->shaveImage(100, 50);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?> 
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    https://www.php.net/manual/en/imagick.shaveimage.php