Adjust a Photo Manually
Although you can use the Enhance button to fix many images automatically, you might want more control over parts of your picture. To adjust an image manually, do the following:
In iPhoto, click a picture you want to edit, and click the Edit button at the bottom of the iPhoto window to display editing tools (see Figure 36-1).
Click the Adjust tab in the upper-right corner of the iPhoto window. An Adjust window appears, displaying several sliders you can move to modify the appearance of the image, as shown in Figure 36-6.
(Optional) Drag the Exposure slider to lighten or darken the image.
(Optional) Drag the Contrast slider to emphasize differences between dark and light areas of the picture.
(Optional) Drag the Saturation slider ...
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