It is a method to increase the sharpness, only on the edges, without creating a deterioration on the darker areas or full color.
We bring our photograph on Photoshop and select the channels panel.
Deselect all the channels, except green and duplicate.
We go on> Filters> Stylize> Find Edges. The image will be like a drawing, showing only the edges. Now press ctrl + I to invert. It's like I created a mask (black areas), while the edges are white.
Let's go to> Filter> Other> Maximum that allows you to increase or decrease the edges of our mask in question.
Set the radius you desire, I set 2, it is very important to remember the value of the radius.
Now we go on> Filter> Noise> Median. This filter has the function to smooth the edges, so do not ever put a value that exceeds 4. In my example I set 2....
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