Resize an image in Photoshop. In this tutorial, you will learn how to resize an image using Adobe Photoshop. Resizing an image in Adobe Photoshop is a fairly simple task which does not require much Photoshop know-how. You should know beforehand that there is no magical way you can salvage picture quality and generate a much larger image at the same time. The actual resizing of the image is only a one-step process. However, this tutorial delves into much detail pertaining to resizing an image in Adobe Photoshop.