How to use Imagick with CI 4 ?

Thank you guys for the answers.

Let me ask you some other questions that are in my mind: Actually I'm happy with 'gd' for general purpose but as I need to catch the cover pages of pdf files as jpg, I need this imagick. Can I continue using both or should I completely go on with imagick? Are there any differences? Additionally, Imagick looks richer than gd and CodeIgniter comes with gd as default. Is this extra dowload (set up) necessity the reason for this default choice?