How to crop curved lined photos?

I want to get a tight crop on my photos that have curves in them. I need to be able to do it on my iphone 5.

Copy picture to computer. Crop. Return picture to phone.

http://keerok-photography.blogspot.com/2012/09/software-for-cropping-picture.html

I like do it in the computer. Better control.

http://www.apple.com/...ps/iphoto/

Still too much? Here. All it took was a few seconds to find it. And I don't even own a single iThing nor plan to have one ever.

http://www.appleiphonereview.com/iphone-tutorials/how-to-crop-your-iphone-photos-in-5-seconds-or-less/

You crop images with image editing software - most have a crop tool.

What's in the photo makes no difference - curved lines, straight lines, it doesn't matter.

Go to the Apple App Store, and type "Image editor" in the search - install one of those, then crop your image.

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