Protect a central part of an image from a change.
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1. Open up any image you would like to use and create a duplicate layer by dragging the current layer to the new layer button.
2. Now apply the change you would like to make to the top layer. (The top layer should have been the result of duplicating your original layer.) I'm choosing to use a Radial Blur fitler. So go to Filter > Blur > Radial Blur. Set the amount to 9, the blur method to spin, and the quality to best. Once your done click ok.
3. Finally add a layer mask to the upper layer and fill it with a radial black-to-white gradient. The gradient mask is used to fade the changed image into the original.