Diffusion

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.

The thin black outline is noticable on the edge between the skin and hair.

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.

Applying a Gaussian blur to the layer mask with the Find Edges filter applied.

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.