Board Thread:Support Requests - Getting Technical/@comment-5739199-20150818000955/@comment--20150818010856

Image manipulation is on the to-do list with portable infoboxes. I inquired about this not too long ago, and Staff said there is currently no way to do this (unless something new came out recently about this I missed), but they are working towards a solution. Portable infoboxes are sill evolving since first inception is what they told me.

You can keep an eye out on the Help:PortableInfoboxes page, as they are updating new features there, as well as following Staff blogs.

So the short answer. No there isn't a way to manipulate them yet. In all honesty, the examples you gave aren't even that bad once you get use to it. I had the same exact case with images being "too big" but now it doesn't seem as bad to me.