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Now I need to compensate for the effects of Gaussian Blur, which has slightly blurred the detail inside this image, and that means we need to sharpen the image slightly, and because this is a portrait shot, the best filter for the job is high pass. So I'll go up to the Filter menu, choose Other, and then choose High Pass, and notice if you loaded dekeKeys it's got a keyboard shortcut, a Shift+F10. And what you want to do is set the High Pass Filter to a radius that still allows you to see the edges, now ten is way too much but I found if I took it down to about five pixels I could still see a little bit of edged detail while most of the image turns gray.
Then I will go ahead and click OK in order to accept that effect. Now we need to turn this filter into Sharpening Effect and we'll do so by modifying the Blend mode. So double-click on the slider icon to the right of the words High Pass. Now we'll bring up the Blending Options dialog box. Now most of the time you want to start things off with the first of the contrast modes, which is Overlay, and that will end up providing us with a little bit of sharpening, and just to get a better sense of what's going on I'll Zoom in to 50%. And so you can see how we have some more tactile detail side of the photograph, it's not enough, however.
So the next thing you'd want to do when you are fooling around with High Pass like this, is try out a Blend mode that has a little bit more impact, and that would be the Hard Light mode, and that's going to end up increasing the sharpness slightly. If that's still not enough which I don't believe it to be, then you want to dropdown two more blend modes to Linear Light and go ahead and try that one out and that gives us a very sharp effect indeed. The problem is, the Radius value is set too high. So I will go ahead and click OK in order to accept the effect so far. And by the way I am working on a standard density screen here, so a zoom level of 50% is ideal for gauging how sharp this image is going to look when I print it at say 300 ppi.
But you may be lucky enough to be working on a retina display like the one included with the new MacBook Pro, in which case you should be able to zoom all the way into a 100%, because there are so many pixels packed on those screens. All right, now I am going to take down the Radius value for my High Pass Filter by double-clicking in the words High Pass here inside the Layers panel, and then I'll go ahead and click on the eye in order to center it inside the dialog box, and I will take the Radius value down by pressing Shift+Down Arrow couple of times in a row until I get a Radius of 3 pixels, which looks a lot better.
The details in other words look more sharply defined and then I will click OK in order to accept that effect. So if I turn-off High Pass you can see this is the slightly blurred version of the image and then if I press Ctrl+Z or Cmd+Z on the Mac. this is the sharper version. Thanks to the High Pass Filter combined with the Linear Light Blend mode here inside Photoshop.
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