Just about any photo can benefit from some enhancement, and that’s where iPhoto’s edit view comes in.
Enhance with a click. You can often improve exposure and color balance with a single click.
Improve composition. Crop your photo to focus attention on your subject or just to improve its framing. And straighten those crooked shots so the ocean doesn’t look slanted.
Retouch and refine. Use the edit view’s tools to retouch blemishes and scratches, improve exposure and color balance, add sharpness, and much more.