Smart Filters also have built-in layer masks, just like Adjustment Layers, so you can interactively paint a mask to constrain the effects of your Smart Filters. The advantage of a Smart Filter over a regular filter is that at any time you can hide or delete a Smart Filter to disable or remove its effect, or you can double-click on a Smart Filter to change its parameters. So, for example, you can add an Unsharp Mask filter to a layer to sharpen that layer. With CS3, you can now attach any filter to a layer as a Smart Filter in the same way that Layer Styles are added to a layer. The feature was limited to only a few effects, though, so you still had to think carefully about structuring your documents in multiple layers to constrain your destructive effects. When Adobe added Adjustment Layers to Photoshop in version 4 in 1996, it introduced the practice of non-destructive image editing to Photoshop. You can also paint a Layer Mask to constrain the effects of your Smart Filters. Smart Filters attach to a layer like a Layer Style.
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