Apple Aperture 3.5 - Manual (Page 335)

Chapter 7 Make image adjustments 335
Use the Boost controls
OS X characterizes each digital camera’s RAW file format to determine an optimal contrast
setting. The Boost controls allow you to set the strength of the contrast when the RAW file is
decoded. The Hue Boost controls are used to maintain the hues in the image as the contrast is
increased using the Boost controls. When the Hue Boost parameter is set to 1.00 and the Boost
parameter is set to 1.00, the hues of the primary and secondary colors are pinned to their pure
color values, resulting in a shift of all the hues in the image.
For images that consist of saturated primary and secondary colors, such as an image of flowers
in a lush garden, shifting the hues to their true values has a desirable visual effect. However, this
is not visually desirable for images containing skin tones. Shifting the hues most often causes the
skin to appear yellow. Setting the Hue Boost parameter to 0.00 increases the color contrast in the
image while preserving the original hues in the image.
Adjust contrast applied during RAW decoding
1 Select a RAW photo.
Note: If the RAW Fine Tuning controls don’t appear in the Adjustments inspector or the
Adjustments pane of the Inspector HUD, the selected image is from a previous version of
Aperture. You must first reprocess the image using the most current RAW image processing. For
more information, see
Reprocess photos from earlier versions of Aperture on page 49.
2 In the Adjustments inspector or the Adjustments pane of the Inspector HUD, adjust the Boost
parameter using the Boost slider and value slider.
Use the Boost slider and value
slider to adjust the amount of
contrast applied during the
RAW decoding process.
A value of 0.00 applies no contrast adjustment to the image during the RAW decoding process.
A value greater than 0.00 increases the contrast adjustment. A value of 1.00 applies the full
Apple-recommended contrast adjustment for the specific camera model.
3 Adjust the Hue Boost parameter using the Hue Boost slider and value slider.
Use the Hue Boost slider and
value slider to protect hue fidelity
during the RAW decoding process.
A value of 0.00 preserves the original hues in the image in relation to the Boost adjustment
(color contrast) during the RAW decoding process. A value greater than 0.00 increases the hue
adjustment. A value of 1.00 applies the full Apple-recommended hue adjustment for the specific
camera model.
Use the Sharpening controls
You can adjust sharpening during the RAW decoding process by using the RAW Fine Tuning
Sharpening controls in the Adjustments inspector or the Adjustments pane of the Inspector HUD.
Note: The effect of sharpening an image or group of images using the RAW Fine Tuning
adjustment is very subtle. More sharpening effects can be obtained using the Edge Sharpen
adjustment. For more information, see
Sharpen an image on page 311.
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