Apple Aperture 2 - Manual (Page 415)

Chapter 15 Making Image Adjustments 415
III
To set the black point of the image:
1 Select an image.
2 In the Exposure area of the Adjustments inspector or the Adjustments pane of the
Inspector HUD, adjust the Black Point parameter by doing one of the following:
 Drag the Black Point slider.
 Click the left or right arrow in the Black Point value slider to change the shadow
detail in the image to recover by 5 percent increments, or drag in the value field.
 Double-click the number in the Black Point value slider, then enter a value from –5.00
to 50.00 and press Return.
Decreasing the value increases the amount of detail in the shadow areas by moving
pure black below the current black point. Increasing the value decreases the amount of
detail in the shadow areas of the image, effectively crushing the blacks by moving pure
black above the current black point.
The image’s black point updates as you change the parameter value.
Use the Black Point slider
and value slider to set
pure black in the image.