Step 10
When I click OK, the zoom radial blur is applied to the layer. Although the center of the zoom is somewhat clear, the effect is too overwhelming and covers too much of the detail on the car. So I’m going to add a layer mask, which lets me basically paint away any area of the zoom effect I want. That’s why I duplicated the layer—so that I’d be able to add a layer mask later to edit where the filter was applied, without destroying the photo. To add a layer mask, click the Add Layer Mask icon on the bottom of the Layers palette. This step adds a white layer mask to the layer. (You can see it added to the right of the layer’s thumbnail in the Layers palette in Figure 10.)