Operation Manual

2 In the Advanced pane, do one of the following:
• By default, the Auto Adjust Black 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 black point in the image, and drag the slider back to the
left to reduce the tolerance.
• By default, the Auto Adjust Black Clip value slider is set to 0.10%. 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 black point in the image, or drag in the
value field.
Clicking the left arrow reduces the tolerance, and clicking the right arrow increases it.
3 Once the black clipping point is adjusted, click either the Auto Levels Combined or the
Auto Levels Separate button in the Levels area of the Adjustments inspector or the
Adjustments pane of the Inspector HUD to view the effect on the image.
To adjust the white clipping point
1 Choose Aperture > Preferences, then click Advanced.
Use the Auto Adjust
White Clip slider and
value slider to add
tolerance to Auto Levels
adjustments when
evaluating colors
beyond white.
2 In the Advanced pane, do one of the following:
• 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 0.10%. 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.
558 Chapter 17 Making Image Adjustments