Apple Aperture 2 - Manual (Page 450)

450 Part III Performing Image Adjustments
6 The Range parameter limits or expands the chromatic range of the adjustment. Adjust
the Range parameter by doing one of the following:
 By default, the Range slider is set to the center of the slider control. Drag the slider to
the left to decrease the range of the selected color, and drag it to the right to
increase the range of the selected color.
 Click the left or right arrow in the Range value slider to change the chromatic range
of the selected color by single increments, or drag in the value field.
 By default, the Range value slider is set to 1.00. Double-click the number in the value
slider, then enter a value from 0.00 to 20.00 and press Return.
7 Repeat steps 2 through 7 until you are satisfied with the appearance of the colors in
your image.
Use the Range slider
and value slider to adjust
the chromatic range of
the color adjustment.
Yellows Reds Cyans
10 10
You can adjust the chromatic range up to 20. The default spread is 1.
Blues Magentas Reds Greens
1