Apple Aperture 3.5 - Manual (Page 283)

Chapter 7 Make image adjustments 283
When you want to automatically adjust the tonal curve of an image based on individual
evaluations of the red, green, and blue channels, you use the Auto Curves Separate button. Red,
green, and blue channels are adjusted based on an evaluation of each channel. The Auto Curves
Separate button corrects the color cast in the image in addition to the contrast.
Before Auto Curves Separate adjustment After Auto Curves Separate adjustment
1 Select a photo.
2 If the Curves controls aren’t shown in the Adjustments inspector or the Adjustments pane of the
Inspector HUD, choose Curves from the Add Adjustment pop-up menu.
3 In the Curves area, do one of the following:
•
To adjust the tonal curve of an image based on total luminance: Click the Auto Curves
Combined button.
Click the Auto Curves
Combined button to
automatically set the
tonal curve for the
photo based on all
three color channels.
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