Consumers use a wide range of devices and brands need to ensure assets display well and keep their core visual message on any of them. With the Image Focal extension, your visitors always get the best view of your images, no matter what device or screen resolution they are using.

The Image Focal extension allows you to associate images with focal point data for more effective cropping amongst different devices and screen sizes. 

https://www.magnolia-cms.com/marketplace/detail/image-focal.html