image display

Hi, I am trying to use a mix of portrait and landscape images on my slider. At the moment there is lots of background colour around the image like so:

https://kellymacphee.co.uk/wp-content/uploads/2016/12/Screen-Shot-2016-12-03-at-09.29.13.png

I would like to acheive this sort of effect
https://kellymacphee.co.uk/wp-content/uploads/2016/12/Screen-Shot-2016-12-03-at-09.28.03.png

Is this possible, and how can I do this?

Also how can I make the slider height adjust for different screen sizes? All I can see at the moment is one fixed height in the settings, which is not ideal.

Hope you can help.
Kelly