Apple Aperture 2 - Manual (Page 359)

Chapter 14 An Overview of Image Adjustments 359
III
Using the Chroma Blur Controls from Aperture 1.1
In previous versions of Aperture, the RAW Fine Tuning controls had a Chroma Blur
adjustment that corrected color artifacts that appear in digital images because of noise
created by digital image sensors. The Moire controls in Aperture 2 replace the Chroma
Blur controls.
The Chroma Blur adjustment controls slightly smear the color to correct color artifacts
that often occur in images shot at high ISO speeds. The Mac OS characterizes each
digital camera’s RAW file format to determine the appropriate chroma blur value. When
you select the Chroma Blur checkbox in the Adjustments inspector or the Adjustments
pane of the Inspector HUD, this default chroma blur adjustment is turned off, allowing
you to set your own chroma blur value.
To adjust the Chroma Blur parameter:
1 Select a RAW image imported with or migrated to Aperture 1.1.
The version is indicated by the RAW Decode Version pop-up menu.
2 In the Adjustments inspector or the Adjustments pane of the Inspector HUD, select the
Chroma Blur checkbox.
3 Adjust the area over which the chroma blur effect is applied by doing one of the following:
 The default value for the Radius slider and value slider is determined by the camera
used to create the RAW image file. Drag the Radius slider to the right to increase the
radius of the area over which the chroma blur effect is applied during the RAW
decoding process, and drag the Radius slider back to the left to reduce it.
 Click the left or right arrow in the Radius value slider to adjust the radius by
increments of one-tenth of a pixel, or drag in the value field.
 Double-click the number in the Radius value slider, then enter a value from 0.10 to
10.00 and press Return.
A value of 0.10 applies the least amount of chroma blur during the RAW decoding
process. A value greater than 0.10 increases the chroma blur effect during the RAW
decoding process.
Select the Chroma Blur
checkbox to modify the
Chroma Blur RAW
decoding settings.
Use the Radius slider and value slider to adjust
the area over which the chroma blur effect is
applied during the RAW decoding process.