Adobe Photoshop CC 2014 v.14.xx - Manual (Page 477)

To create a Radial Filter, click and drag the mouse across the region, and draw a circular or elliptical shape. This shape determines the
area that is affected or excluded from the alterations you are about to perform.
To edit a Radial Filter, click any of the gray handles on the photo. When selected, the handle turns red.
5. To determine what area of the photo is modified, choose an Effect option (located below the sliders).
Outside. All modifications are applied outside the selected area.
Inside. All modifications are applied to the selected area.
6. Adjust the size (width and height) and orientation of the Radial Filter added. Select a filter, and:
Click and drag the center of the filter to move and reposition it.
Hover the pointer any of the four filter handles, and when the pointer icon changes, click and drag to change the size of the filter.
Hover the pointer close to the edge of the filter, and when the pointer icon changes, click and drag the edge of the filter to change the
orientation.
The Radial Filter is represented by an elliptical marquee
7. Use the sliders to modify the selected Radial Filter area. The Feather slider adjusts the falloff of the applied effect.
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