Adobe Photoshop CC for Photographers, 2014 Release, 2nd Edition

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Chapter 6: Extending the dynamic range

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The Radius slider in the Local Adaptation HDR Toning dialog Edge Glow section (Figure 6.8) is said to control the size of the glow effect, but I prefer to think of this as a ‘global contrast’ control. Basically, the tone mapping process lightens the shadows relative to the highlights and the tone mapping is filtered via a soft edge mask. Increasing the Radius amount widens the halos. At a low setting you’ll see an image in which there may be a full tonal range from the shadows to the highlights, but ...