Photo editing is my passion Photoshop files can consist of multiple layers, which you can also edit individually. For example, a largely transparent foreground layer may contain your company logo, while a background layer contains a pattern or solid color. Photoshop usually locks the rearmost layer to ensure that the project always has a background. This prevents you from editing or transforming the background. To change to a new background, you must unlock the current background and apply your new background as a separate layer.