Image outside content folder?

How to use an image that is stored inside the content folder is clear.
However, I fail to figure out how to use images that are stored outside of that, say in the assets folder.

The closest I got was using new Asset. But then I’d have to convert that to an Image object to do things like resizing, I assume.
Which is where I got stuck, although I’m worried that the answer will be embarrassingly simple…

new Asset() or using the asset() helper is the way to go. The same methods as for files are available, see Asset | Kirby CMS