Tutorial: Restoring Dark Images with Photoshop (page 5)
To sharpen the image we again duplicate the background layer.
To this layer we apply a high-pass filter (listed in the filters drop-down menu under "other") .
We want to adjust this so that there is only a hint of color at the edges of forms.
This layer too will be an overlay.
Now we just adjust the opacity slider to select the amount of sharpening we want.
Okay, let's see how we did.
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