Apple Aperture 2 - Manual (Page 366)

366 Part III Performing Image Adjustments
Working with Automatic Adjustments
Aperture comes with a set of automatic adjustment controls. These controls analyze
the image and apply an adjustment to the image based on that analysis. This is a good
way to make a quick correction to an image before fine-tuning the adjustment with the
manual adjustment controls.
The automatic adjustments include:
 Auto Exposure button: Click the button to have Aperture automatically adjust the
exposure of the selected RAW image.
 Auto Levels Combined button: Click the button to have Aperture automatically adjust
the levels in the selected image based on the combined luminance values of all three
color channels.
 Auto Levels Separate button: Click the button to have Aperture automatically adjust
the levels in the selected image by individual color channels.
Auto Exposure
Auto Levels
Separate
Auto Levels
Combined