See My Image at Full-Screen Size?

Press the letter F on your keyboard twice. The first time you press it, it just hides the window that surrounds your image. But, the second time, it hides everything and displays your image full-screen size. Now, for some reason, one thing it doesn’t hide in Full Screen mode is Photoshop’s Rulers. So, if you have them visible, once you’re in Full Screen mode, press Command-R (PC: Ctrl-R) to hide them. To return to the regular size view (and see the rest of Photoshop), just press F again.