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Restore Edge Sharpness
In this portion of the tutorial, you'll learn how to restore the edge sharpness. This portion of the tutorial is optional but we recommend that you follow it on your first try so that you'll be able to see the difference.
Step 8
We need to add another layer mask but Photoshop will only allow one raster layer mask per layer. To get around this, we'll simply group the layer (Layer> Group Layers or Ctrl+G) and add a layer mask (Layer> Add Layer Mask> Reveal All) to the new group created.
Step 9
Click on the thumbnail of the new layer mask. With the layer mask selected, use the Apply Image tool to apply the entire image to the layer mask. The default settings should be fine.
Step 10
Apply a Find Edges filter (Filter> Stylize> Find Edges).
Step 11
Use the Zoom tool (Z) and zoom in around 300-400% to an a edge. If you look closely at your image, you may be able to notice a thin black outline on the edges. The line is caused by the Find Edges filter.
Step 12
To remove the outline, we'll simply blur the layer mask with the Find Edges filter applied just a tiny bit. Open the Gaussian Blur filter tool (Filter> Blur> Gaussian Blur), set the radius to 3 pixels and click OK.
Step 13
Hold shift and click on the thumbnail of the top layer mask to view the image without the layer mask and undo to revert. You'll notice that the layer mask increases sharpness but reduced the diffusion glow effect. If you want to keep the diffusion glow effect, simply disable the layer mask by holding the Shift key and clicking on the thumbnail of the top layer mask.
