Apple Aperture 2 - Manual (Page 419)

Chapter 15 Making Image Adjustments 419
III
Adjusting Definition in the Image
When you want to add a little clarity and definition to an image without adding too
much contrast, you use the Definition parameter controls. The Definition parameter is
useful for adding local contrast (adding contrast to areas of the image that are
improved by a contrast adjustment without affecting the image’s global contrast), as
well as reducing haze.
To adjust definition in an image:
1 Select an image.
2 In the Enhance area of the Adjustments inspector or the Adjustments pane of the
Inspector HUD, adjust the Contrast parameter by doing one of the following:
 Drag the Definition slider.
 Click the left or right arrow in the Definition value slider to change the clarity of the
image by 5 percent increments, or drag in the value field.
 Double-click the number in the Definition value slider, then enter a value from
0.0 to 1.00 and press Return.
A value greater than 0.0 increases the clarity in the image. The definition in the image
updates as you change the parameter value.
Before Definition adjustment After Definition adjustment
Use the Definition
slider and value slider
to add local contrast
to the image.