This tutorial will show you how you can add more canvas area easily using the Crop tool in Photoshop.
Step 1.) Open your image, zoom out (ctrl -), and press ‘f’, then set the background color for your canvas area. In this case, I want to add black canvas area to my photo. So I set my background color to black.
Step 2.) Now choose your Crop Tool from your Tool Pallete or by typing ‘c’.. then drag out a cropping marquee border on your image. Don’t worry about the size.
Step 3.) Grab the corner point of your marquee border and drag outside the image area into the gray area. Position the border where you wan to add the canvas space.
Step 4.) Press Enter, the grey area outside your image is now become black canvas space. From here, you can put a white border using stroke to your image, and add text in the bottom canvas area like my final image below..
See also: Photoshop Tutorials