Saving/Exporting an Image (Directly from 3D View) What if I want to save an image, but not actually render it?

An ‘unrendered’ image.

It’s important to note (I think) that the window captured in the screenshot was the UV Editor, containing the rendered image—as well as the option to ‘Save As Image’ (F3)—right up until I selected ‘3D View’ from the popup menu at lower-left.

Now that I’ve selected that, and have the image I want, there is no option to save or export it.

Please help.
Your only options are to either do an OpenGL Render (available via the Render menu at the top of the window) - which will re-render your image using OpenGL (which is what the viewport uses so is quick and should look the same as your image) - or you can tell Blender to take a screenshot of your current Blender window by pressing Ctrl+F3 (although once you've saved your screenshot you'll need to open an image editor (eg, Gimp) to trim off the rest of the window as the screenshot will consist of everything).