Reduced Noise Sharpening Method
Here’s a sharpening technique that allows you to provide a relatively noise and artifact free sharpening to an image without using the standard Photoshop sharpening filters.
First make a duplicate layer of the original background layer by typing Ctl J (PC) or Cmd J (Mac). On the filter tab go to Filter/Other/High Pass. The image will appear as a grayscale image with accentuated edges. Adjust the slider at the bottom of the high pass filter dialog box to from approximately 1.0 to 3.0 or until a sufficient amount of edge detail is visible on the image. Then click ok to apply the filter.
Then with your duplicate layer highlighted, change the mode (box at the top of the layer panel) from ‘Normal’ to ‘Overlay’ or ‘Soft light’. (Overlay is a bit stronger of an effect). You can then adjust the strength of the layer sharpening by changing the opacity of the layer using the ‘Opacity’ slider on the upper right of the dialog box.
This effect tends to sharpen mostly prominent edges and ignores the open areas like sky and large smooth areas of relatively low detail.
Photo credits: , Lightart.