Apple Aperture 1.5 (New Features) - Manual (Page 15)

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4 Adjust how the sharpening effect is applied to edges by doing one of the following:
 The default value for the Edges slider and value slider is determined by the camera
used to create the RAW image file. Drag the Edges slider to the right to intensify the
sharpening effect that occurs at “hard” edges (areas where significant color changes
occur) during the RAW decoding process, and drag the Intensity slider back to the
left to limit it.
 Click the left or right arrow in the Edges value slider to adjust the strength of the
sharpening effect that occurs at hard edges by 5 percent increments, or drag in the
value field.
 Double-click the number in the Edges value slider, then enter a value from 0.00 to
1.00 and press Return.
A value greater than 0.00 intensifies the sharpening effect on hard edges.
Using the Chroma Blur Controls
Digital images have color artifacts that appear because of noise created by digital
image sensors. The Chroma Blur adjustment controls slightly smear the color to correct
these artifacts. 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 Adjustments 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.
2 In the Adjustments Inspector or Adjustments HUD, select the Chroma Blur checkbox.
Use the Edges slider and value slider to adjust
how the sharpening effect is applied to edges
during the RAW decoding process.
Select the Chroma Blur checkbox
to modify the Chroma Blur RAW
decoding parameters.