[Plugin: GRAND FlAGallery] Vertical photos

My client has been uploading vertical photos into the gallery. However, since the gallery is basically set to be horizontal, vertical photos do not look very good. Is there a way to center vertical photos in the space even if there is black around the edges?

I created a photoshop template that would essentially do this for them but they don’t want to go through the hassle of saving out every vertical photo again which I can understand.

https://www.robbinsfloor.com/gallery/wood/

The first photo I created the template file, the second one, is the vertical photo for testing.

https://www.ads-software.com/extend/plugins/flash-album-gallery/