3.4

Chapter 16 Making Image Adjustments 330
4 Maintain edge detail in areas of high contrast in the image by doing one of the following:
•
Drag the Edge Detail slider to the right to increase sharpness in areas of the image with high
contrast, or drag the slider back to the left to reduce the sharpening eect.
•
Click the left or right arrow in the Edge Detail value slider to adjust edge detail by 5 percent
increments, or drag in the value eld.
The left arrow decreases edge detail sharpening in the image, and the right arrow increases it.
•
Double-click the number in the Edge Detail value slider, then enter a value from 0.0 to 3.0 and
press Return.
As you change the parameter value, the image is updated to display the amount of edge detail
sharpening applied to it.
You can also brush the Noise Reduction adjustment on selected parts of an image. For more
information, see An Overview of Brushed Adjustments on page 392.
Working with the White Balance Controls
An Overview of the White Balance Adjustment
If an image has unnatural skin tones or pixels that should be pure white, you can use the White
Balance adjustment controls to remove the color cast from the image. Aperture provides three
methods for adjusting an image’s white balance:
•
Balance the warmth of the image based on natural gray.
•
Balance the warmth of the image based on skin tones.
•
Balance the image based on traditional color temperature (in degrees kelvin) and tint.
You can adjust an image's white balance automatically or manually. In most cases, the automatic
adjustment succeeds in removing the color cast from the image. You can also use the White
Balance eyedropper to choose the natural gray or skin tone pixels that Aperture uses to balance
the image. If either the Auto White Balance button or the White Balance eyedropper does not
completely remove the color cast from the image, you can use the White Balance controls to
ne-tune the adjustment.
Although Aperture can set the white balance of the image with great accuracy, sometimes you
have to use a combination of these methods to have the image appear with the warm or cool
tonality you intended.
Before White Balance adjustment After White Balance adjustment