tr4jan my question was originally a new post that then was merged into this thread (hence "whoever created the shortcut"—I pulled it from the Resources page, not this thread, and that shortcut, while working, does not include the rounded corners). It was not a direct comment. Before posting, I did search for terms like "border radius" but didn't come across this post and the title doesn't directly relate to rounded corners.
I've been trying with the shortcut in this thread (that should have rounded corners) but it's not working for me. No images get passed to the selected note. I'll do some troubleshooting later today and see if I can spot my problem.
Primarily, I just want to know what the border radius is that @Matthias and others are using to create the headers so I can manually make my own. Even using the shortcuts, it doesn't necessarily crop it where I'd like it to. I'm a foot/30cm taller than my girlfriend so it takes some special care to get us in the same header image 😉