Youre only selecting hair and nothing else or only

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you’re only selecting hair and nothing else, or only selecting smooth edges and nothing else, you’ll probably find that you’re better off leaving Smart Radius disabled. Of course, it’s easy to select it and then decide if things look better or worse, but don’t think you need to use the option just because it’s there and it has “Smart” in the name. There are other ways to adjust the size of the radius, as we’re about to see! Step 4: Manually Adjust The Radius With The Refinement Brushes Once we’ve done all we can with the Radius slider and the Smart Radius option, we can then manually refine our radius using a couple of brushes that come with the Refine Edge command. If you look to the left of the Radius and Smart Radius options, you’ll see a brush icon. If you click and hold on the brush icon, a menu will appear where you can select the brush you need. The two brushes we have to choose from are the Refine Radius Tool and the Erase Refinements Tool: Click and hold on the brush icon to access the radius refinement tools (brushes). The names can be a bit confusing, so you may find it helpful to think of the Refine Radius Tool as the Add to Radius brush and the Erase Refinements Tool as the Subtract from Radius brush. Adobe calls them "Tools" but they behave exactly like brushes, allowing us to simply paint over the areas in the image where we need to add to, or subtract from, the existing radius.
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By default, the Refine Radius Tool is already selected for us because that’s the one we use the most, so there’s no need to actually select it from the list. There’s also no need to select the Erase Refinements Tool from the list because at any time, we can temporarily switch from the Refine Radius Tool to the Erase Refinements Tool simply by pressing and holding the Alt (Win) / Option (Mac) key on the keyboard. When you release the Alt / Option key, you’ll switch back to the Refine Radius Tool. In other words, you’ll never need to select either tool from the dialog box, so you can safely forget all about that brush icon. Before I try to add more of the woman’s hair to my selection, I’m first going to use the Erase Refinements Tool to remove the unwanted radius area from the bottom of my image. Keep in mind as you use these tools that unlike Photoshop’s other selection tools, we’re not adding to, or subtracting from, the actual selection itself with these tools. We’re simply adjusting the size of the area that Photoshop is analyzing. Photoshop determines which pixels to select and which to ignore. We’re just telling it where to look and where not to look. I’ll hold down my Alt (Win) / Option (Mac) key to temporarily switch from the Refine Radius Tool to the Erase Refinements Tool. It’s a bit hard to see in the screenshot, but a small minus sign (-) appears in the center of the brush cursor when the Erase Refinements Tool is active (a plus sign (+) appears when the Refine Radius Tool is active). Then I’ll simply click and drag over the unwanted radius areas to erase them. Since I still have the
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