Ah, ok, doesnt know about..
simplest way: photoshop, gimp or something else for cropping the image ( !!that the customer has to send!!) Or it will be more expensive ;-)
Do you have photographer as customer? With big sized images? They will have to be informed about images-sizes and how to reduce them.
Upload a good image and crop it in the templates to the desired size. So you are not loosing quality.
Sorry, if i wasnt helpy..