Image magick SilverStripe

_config.yml

---
Only:
  classexists: 'Imagick'
---
Image:
  backend: 'FixedImagickBackend'

ImagickBackend:
  default_quality: 80

FixedImagickBackend.php

<?php

/**
 * Add missing "crop" method to ImagickBackend, so that it works with the focuspoint module
 */
if(class_exists('Imagick')) {
    class FixedImagickBackend extends ImagickBackend
    {
        public function crop($top, $left, $width, $height)
        {
            if (!$this->valid()) {
                return;
            }

            $new = clone $this;
            $new->setBackgroundColor(new ImagickPixel('transparent'));
            $new->cropImage($width, $height, $left, $top);

            return $new;
        }
    }
}