If you’ve read this blog before, you know that I’m a big fan of Google’s Picasa for managing photos, and sharing photos online. A new tip that was recently released on the Google Photos Blog allows you to view a full-screen preview of the picture without having to double-click the photo. Simply hold the “Ctrl” key and then press and hold the “Alt” key. While both keys are held down, you’ll have a full-screen preview of the photo. Once you release the “Alt” key, you will be taken directly back to the library view.
Check out the full post at the Google Photos Blog – Google Photos Blog: Quick tip: super-fast full-screen previews.