The first thing we need to do before we darken any edges is create a copy of our photo so that we don’t damage our original pixel information. If we look in our Layers palette, we can see our photo sitting comfortably on the Background layer
We need to create a copy of this layer, so go up to the Layer menu at the top of the screen, choose New, and then choose Layer via Copy. Or, for a much faster way, use the keyboard shortcut Ctrl+J (Win) / Command+J (Mac). Either way tells Photoshop to create a copy of the Background layer for us, and if we look again in the Layers palette, we can see that we now have a copy of the layer, which Photoshop has automatically named “Layer 1″, sitting directly above the Background layer
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