Apple MB673Z/A User Manual - Page 439
Adjusting the Radius of the Highlights & Shadows Controls
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III Adjusting the Radius of the Highlights & Shadows Controls You use the Radius parameter controls to adjust the area around each pixel that Aperture uses to assess the tonal area that each pixel inhabits. The larger the radius value is, the larger the area used to determine each pixel's tonality. The Radius controls can have a large impact on the behavior of the Highlights & Shadows controls, because the Radius controls either increase or decrease the range of pixels used to determine how light or dark each individual pixel should be. To adjust the radius of the Highlights & Shadows controls: 1 If necessary, click the Advanced disclosure triangle to show the advanced Highlights & Shadows controls. Use the Radius slider and value slider to adjust the area used to determine a pixel's tonality. 2 Adjust the Radius parameter by doing one of the following: Â By default, the Radius slider is set to the left side of the slider control. Drag the slider to the right to increase the radius of the area Aperture uses to assess whether the pixel requires a highlights or shadows adjustment, and drag the slider back to the left to reduce the radius. Â Click the left or right arrow in the Radius value slider to adjust the radius by single-pixel increments, or drag in the value field. The left arrow reduces the radius of the pixel area, and the right arrow increases it. Â By default, the Radius value slider is set to 200.00. Double-click the number in the Radius value slider, then enter a value from 1.0 to 1000.0 and press Return. Aperture uses the new Radius setting to determine each pixel's tonality in relation to the pixels that surround it. Chapter 15 Making Image Adjustments 439
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