Set tag color of image in Preview with hotkey/keyboard shortcut

I'd like to be able to add a tag color to an image I'm viewing in Preview with a hotkey / keyboard shortcut.

I found something for Finder: https://discussions.apple.com/thread/6511743?start=0&tstart=0 but I can't replicate it with Preview.

My use case is that I'd like to open ~1000 images in Preview when I come back from a photoshoot, view each one fullscreen, and have the option to easily tag each image with a color while I view it. So, I'm scrolling through, I see an image I want to mark, CMD+R (or whatever), and its given a red tag, which I can easily find later in Finder. It seems like a pretty simple request, but I haven't found anyway to do this.

Solution 1:

From the MacOS Documentation on this feature:

Tag an open file: Hold the pointer to the right of the document title, click the arrow, click in the Tags field, then enter a new tag, or choose one from the list.