I got a n00b question. You know when you take a photograph and start cropping it etc. But then you want to print it. I know there are certain sizes that are standard in print (e.g. this thread title "16x20"). My question is: is there a way in a photo editing software (LR, PS, Aperture) to make this a standard? Like are there templates we should be cropping to etc? Sorry if i'm not too clear.