The adjust edge options below the edge detection

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The Adjust Edge Options Below the Edge Detection options in the Refine Edge dialog box are the Adjust Edge options – Smooth, Feather, Contrast, and Shift Edge. All four of these options are set to 0 by default and when using the Refine Edge command for selecting hair, it’s usually best to leave at least the first three options (Smooth, Feather and Contrast) set to 0. The Smooth option is used for smoothing out jagged selection edges, but it usually causes problems when selecting hair. The Feather option will blur the selection edge which just makes things look soft, blurry and unprofessional. And the Contrast option will attempt to sharpen up selection edges by boosting contrast, again not something that usually works well with hair. The only option you should try is the fourth one, Shift Edge. Dragging the slider to the right of center will expand your selection edges outward, which may help to add more hair to the selection, while dragging the slider to the left of center will contract the selection edges inward, tightening up the selection. If neither direction helps to improve your results, simply drag the slider back to center. In my case, I’m going to drag the slider to the right to increase the Shift Edge value to +20%:
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Increasing the Shift Edge value to expand the selection edge outward. This expands my selection edges outward and I now see more fine hair detail being added to the selection, although much of it looks very faded at the moment, but we’ll fix that next: Increasing the Shift Edge option added additional hair detail to the image. Step 5: Remove Any Fringing By Decontaminating The Colors Things are looking good except for one remaining problem. We’re seeing a lot of fringing around the hair, which is remaining color from the original background. We can remove the fringing using the Decontaminate Colors option, found in the Output section at the bottom of the dialog box. By default, Decontaminate Colors is turned off. I’ll click inside its checkbox to turn it on:
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Selecting the Decontaminate Colors option. I can now clean up the fringing by dragging the Amount slider towards the right. The default Amount value is 50%. As you drag the slider further to the right, Photoshop removes the fringing by physically changing the color of the pixels around the hair so that they match the color of the hair itself rather than the original background color. I’ll increase my Amount value to 75%: Increase the Decontaminate Colors amount to remove fringing around the hair. The hair now appears darker, especially the finer strands that were originally light gray, and the fringing has been removed: The image after removing the fringing with the Decontaminate Colors option. Step 6: Output The Selection
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The Adjust Edge Options Below the Edge Detection options in...

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