If you’re getting ready to slice an image for the Web and you still have your layers intact, don’t flatten that image before you slice. Instead, let Photoshop create the (layer-based) slices for you. There are two main advantages: (1) it’s easier. You don’t have to drag out slices—Photoshop does it automatically, perfectly slicing at the size of your layer. But even better is (2), when you create a layer-based slice, you can move the layer and (get this) Photoshop will automatically adjust all the slices to accommodate your move, and it will create a new slice for your layer as well. If you slice manually and move your layer—you’re out of luck—the old slice stays right where it was. Plus, creating a layer-based slice couldn’t be easier. Click on the layer you want to slice, then go under the Layer menu and choose New Layer Based Slice—Photoshop does the rest.