How to copy a photo from Camera Roll to app's Documents folder as a JPG/PNG?
<p>How can I copy/move a photo from Camera Roll to an app's own Documents folder? <code>UIImagePickerController</code> returns a <code>UIImage *</code> by:</p>

<pre><code>(UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage]
</code></pre>

<p>How can I save the <code>UIImage *</code> as a file (best with all the EXIF information embedded)?</p>
