FaceCollage by RhinoDevel
FaceCollage automatically finds faces in photos selected by the user and generates a collage of all people found.
The collage image will be saved to the iOS device’s picture library from where the user can upload it to a web service, send it via eMail, etc.
FaceCollage also offers options to manipulate the output image (aspect-ratio, size, etc.).
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Developer Website: http://photorhino.wordpress.com/