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Edge Sharpening Photoshop Tutorial
Step 1Open a photo you would like to edit. Or, you may use the photo used in this tutorial (from iStockPhoto).
Step 2Duplicate the layer and apply your desired sharpening technique on the new layer. Some basic sharpening tools are available in the Filter> Sharpen> menu. For this tutorial, we will use the luminance sharpening technique which only sharpens the grayscale data and leaves the color data untouched. However, to do this, we’ll need to change the image mode to LAB color. Because changing the image mode too much will affect the image quality, in the next step, we’ll create a duplicate state to apply the luminance sharpening to.
Step 3Create a duplicate of the image. In the History pallet (Window> History), click on the Duplicate State button ().
Step 4With the new image file, apply your desired sharpening technique. I will be using the Smart Sharpen filter (Available on Photoshop CS2+ only) on the luminance channel. Go to Image> Mode> Lab Color to convert the image to Lab color. Then, press Ctrl+1 to select the luminance channel. The image should now appear grayscale. Go to Filter> Sharpen> Smart Sharpen and use the tool to sharpen the image. If the Smart Sharpen filter isn't available, use the Unsharp Mask filter (Filter> Sharpen> Unsharp Mask) instead.
Step 5Select Window> Tile Vertically or Tile Horizontally (either one is fine). The two documents should now be side by side. Activate the window with the sharpened image. Click on the Background layer in the layers pallet and drag the layer to the window with the original, unsharpened image. Now you should have two layers; one with the sharpening applied and one without.
Edge DetectionBefore we can filter where the sharpening is visible, we need to find the edges of the image.
Step 6Zoom in to about 300% so that you're able to clearly see the fine pixel-sized details. Notice the grain on the skin caused by sharpening in the photo below.
Step 7To remove this, we'll need to create a layer mask with the edges. Activate the top layer and add a layer mask (Layer> Add Layer Mask> Reveal All).
Step 8Make sure the layer mask is activated. The thumbnail of the layer mask in the layers window should have a white border around it. If it doesn't, click on the thumbnail to activate the layer mask.
Now we'll copy the photo into the layer mask. With the layer mask activated, open the Apply Image tool (Image> Apply Image) and apply these settings: Layer: Background Channel: RGB Invert: Unchecked Blending: Normal Opacity: 100%