Straighten a Photo
You can straighten a crooked photo using the iPhoto application, which comes with all new Macs as part of iLife, and is also available separately via the App Store. If you do not use a tripod when taking pictures, getting your camera perfectly level when you take a shot is very difficult and requires a lot of practice and a steady hand. Despite your best efforts, you might end up with a photo that is not quite level. To fix this problem, you can use iPhoto to nudge the photo clockwise or counterclockwise so that the subject appears straight.
Straighten a Photo
Click the photo you want to straighten.
Click Edit ().
iPhoto ...
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