There are three optional parameters to adjust and an eraser section to touch-up on the crop area with your finger. Works best if the objects are large, closed boundary and has a high contrast from the background. Results could be saved in the Photos App, Documents folder or shared on social media. To get a PNG file with a transparent background, save in and navigate to Crazy Cropper's Documents folder in iTunes. Install Crazy Cropper now to start cropping your pictures.