As we’ve done in many of the techniques, you’ll start by pressing Command-J (PC: Control-J) to duplicate the Background layer. Then use the Image>Canvas Size command, or press Command-Option-C (PC: Control-Alt-C), to add 1 inch of canvas (with the Relative checkbox turned on) to both the width and height. Finally, press-and-hold the Command key (PC: Control key) and click on the Create a New Layer icon at the bottom of the layers palette to add a new layer below the copied Background layer. In this case, I clicked on the Foreground color swatch at the bottom of the Toolbox, chose a shade of gray, and pressed Option-Delete (PC: Alt-Backspace) to fill this new layer with gray. I did this because my photo had a very light background and I wanted to see the edges of the image. (Depending on the image, you can also fill the new layer with white, if you choose.)