I purposely skipped over the first two view modes

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I purposely skipped over the first two view modes – Marching Ants and Overlay – because neither of them is all that useful. The Marching Ants mode will show the standard selection outline, while the Overlay mode will display the non-selected area as a translucent red overlay similar to how the selection would appear in Quick Mask mode. We’ll look at the last view mode in the list – Reveal Layer – a bit later. The purpose of these different view modes is to make it easier for us to judge our selection as we’re refining it. With some images, the selection may be easier to see against white, others against black, and so on. Often, we’ll need to jump between view modes as we’re working, which is why you may have noticed that each of the view modes in the list has a letter to the right of its name. The letter is the keyboard shortcut for quickly switching between view modes, and they’re handy to know. For example, you can switch to the On White mode by pressing the letter W on your keyboard, the On Black mode by pressing the letter B, the On Layers mode by pressing the letter L, and so on. You can also press the letter F repeatedly to cycle between the view modes. If you prefer to select your view modes from the list rather than with keyboard shortcuts, make sure you double- click on the name of the mode. This will select the view mode, then close out of the list. Step 3: Increase The Radius Value Directly below the View Mode option in the Refine Edge dialog box is a section called Edge Detection. This, as they say, is where the magic happens. To add more of the hair to your selection, click on the Radius slider and begin dragging it towards the right: Click and drag the Radius slider towards the right.
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As you drag the slider, you’ll see some of the hair that was outside of your initial selection beginning to appear. I’m using the On Layers view mode to make it easier to see the hair as it will actually appear in front of my background image. You may be using a different view mode: Some of the hair outside the initial selection is now visible. If I continue dragging the slider to the right to increase the Radius value: Dragging the Radius slider even further. Then hair even further away from my initial selection begins to appear:
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The image after increasing the Radius value. So what exactly is happening here? What does this Radius value have to do with selecting hair? If you look to the right of the View Mode preview thumbnail at the top of the dialog box, you’ll see an option called Show Radius which by default is turned off. Click inside its checkbox to turn it on: Selecting the Show Radius option. With this option enabled, we can actually see the radius in the document window. The way the Refine Edge command works is that it looks around the edge of our initial selection to decide what else needs to be included in the selection, and the Radius value controls how far away from our initial selection edge that Photoshop will look. It doesn’t look across the entire image. It only looks within the distance we specify. That’s why the Radius
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I purposely skipped over the first two view modes Marching...

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