Step 3: Now it’s time to add the High Pass fl lter. Go to Filter > Other > High Pass. Move the Radius slowly upward until you just barely see your image’s edges in the gray preview. Anything past 5 pixels or so won’t actually sharpen— cranking it up will make your image begin to take on a faux-HDR look. So don’t go too far. When you’re done, click OK.
Note: The smaller the original image, the smaller the Radius you’ll need.