In this hour, you learned about page sizes and background colors, and practiced using the File Browser to find your favorite images. We talked about the importance of saving your work, and how to do so. We listed the file formats Photoshop supports and what each one does, and covered file resolution and how it can be changed. You found that Web images are saved differently than print images and learned how to find the most efficient way to save a Web graphic. Finally, we covered undoing and redoing, and the Undo History Palette, which lets you retrace your steps backward as you work on a picture.