Apple Aperture 2 - Manual (Page 372)

372 Part III Performing Image Adjustments
To adjust the white clipping point:
1 Choose Aperture > Preferences, then click General.
 By default, the Auto Adjust White Clip slider is set to the left side of the slider control.
Drag the slider to the right to increase the tolerance of Auto Levels adjustments to
colors beyond the analyzed white point in the image, and drag the slider back to the
left to reduce the tolerance.
 By default, the Auto Adjust White Clip value slider is set to 0%. Double-click the
number in the value slider, then enter a value from 0% to 10% and press Return.
 Click the left or right arrow in the value slider to change the tolerance of Auto Levels
adjustments to colors beyond the analyzed white point in the image, or drag in the
value field.
The left arrow reduces the tolerance, and the right arrow increases it.
2 Once the white clipping point is adjusted, click either the Auto Levels Combined or
Auto Levels Separate button in the Adjustments inspector or the Adjustments pane of
the Inspector HUD to view the effect on the image.
Resetting Auto Levels Adjustments
You can always reset the levels of your image back to their original values.
To reset the levels of the image:
m Choose Edit > Undo Auto Adjust (or press Command-Z).
Working with the Red Eye Correction Controls
You use the Red Eye tool and the Red Eye Correction adjustment controls to reduce the
red-eye effect in the eyes of the subjects in your image. You use the Red Eye tool to
place targets on the red eyes of the subjects in the image, and then you can adjust the
radius and sensitivity of the target overlays using the Red Eye Correction controls.
Aperture desaturates the red pixels within the target overlay area, reducing the effect.
Use the Auto Adjust
White Clip slider and
value slider to add
tolerance to Auto Levels
adjustments when
evaluating colors
beyond white.