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Page 2 of 4 Applying the High Pass filter Photoshop CS2 or older: Select the top layer and follow the rest of this step. This technique works by separating the high pass and low pass data so that they can be modified separately. A low pass is simply a blur and a high pass is the opposite (the sharpness and details). We'll begin by adding a High Pass filter. Choose Filter > Other > High Pass.  The High Pass filter window should appear. Set the Radius to 3 and click OK.  Photoshop CS2 or older: Change the blending mode of the top layer to Hard Light. Skip the rest of this step. Your image should look gray now and we need to make it blend into the image. Because we used smart filters, we're always able to change the settings of the filter. In the Layers palette, you should now see the High Pass smart filter listed below the layer. Beside the High Pass text is a button that you can double-click to edit the blending option. Go ahead and double-click on that icon.  The Blending Options window will appear. In this window, change the mode to Hard Light. Your image should look overly sharp right now and this is normal because we haven't applied the low pass effect yet.  Here's what your image should look like with the High Pass filter. It looks very sharp because we basically added additional sharpness to the image with the High Pass filter. In the next steps, we'll add a low pass filter that will even out the sharpness of the image. 
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Photoshop Tutorials 