Featured content image size

Is it possible to adjust the featured content image size to be more like in the 'catch responsive' theme? All my page featured images are 1200x400 so I'm ending up with a very shallow image displayed on the homepage featured content. Ideally I'd like to set it so that the image is always a certain height in the featured content and simply excludes part of the page featured image its drawn from if it doesn't fit the perimeters. Is this possible? Thanks for your help, Jonny