Actually, I solved it way easier than I thought was possible. A simple css trick was enough: changing the display property of the av_table_col class from ‘table-cell’ to ‘table-row’. :-)
Thanks. The ‘magazine’ size is the right one for me. However, only half of my issue is solved.
Images that are large enough are cropped and fit perfectly (that’s one half solved). But there is one image (the first slide in the same link) that is very wide but also short. It does scale up a bit, but not enough to fill even the ‘magazine’ thumbnail height. If it does scale at all, I guess it should be possible to make it scale all the way up, right?
The images fill the width nicely, but I would also like them to fill a set height (i.e. 400px), even if that means that their sides will be cropped and they will be scaled up.
In other words: I would like the slider in a portfolio element to behave like the fullscreen slider does, but with set dimensions that match the elements width (as they do now) but also some set height.
(the link will be in the next private post)