I make apps for the iphone that are easy for people to use.
My target audience is someone who needs to crop photos on their phone that they took, so it could be anyone. Their technical knowledge could be very low. This is a very simple app for them to use.
I'm looking for an icon that will indicate that the application is used for image cropping. It should contain no words. The icon should be usable at all iphone icon sizes which ranges from 512x512 tiff down to 57x57 png.
I need something that stands out, but also clearly communicates image cropping as the function.