iPhoto You can do many editing tasks in iPhoto, such as rotating and cropping a photo, changing a color photo to black and white, adjusting exposure and contrast, and reducing red-eye. If you want to make other changes to a photo, you can open it in another image-editing application, such as Adobe Photoshop.
To edit photos in another application:
Choose iPhoto > Preferences, click Advanced, and choose “In application” from the “Edit photo” pop-up menu.
In the Open dialog, select the application you want to use to edit photos, and then click Open.
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In iPhoto, select a photo and click the Edit button.
The photo opens in the application you selected.
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Edit the photo and save it. Don’t change the photo’s filename or file format.
You see your changes the next time you open the photo in iPhoto.
Important: Nondestructive editing does not apply to photos in your iPhoto library that you edit in a different application. You can, however, always revert to the original version of the photo that was imported into iPhoto.
For RAW-format photos: By default, when you edit a RAW-format photo in another application, iPhoto opens a JPEG-format copy of the photo. To open the original RAW-format file instead, choose iPhoto > Preferences, click Advanced, and then select “Use RAW when using external editor.” When you finish editing, you must save the edited version on your computer and reimport it into iPhoto.
Note: If you use Mac OS X Lion v10.7 (or later), and want to edit your photos in Preview, click Unlock if an alert appears in Preview. For more information, see Apple Support.