I captured an image on my cell phone that I would like to post-process on my computer. It's a 4MB image. However, I notice that if I crop it using my cell phone, I am given the choice of saving it as either an 8MB or a 5MB image. I assume that's because the cell phone automatically upsizes it. Am I better off upsizing it that way or upsizing it using the post-processing software I regularly use on my computer?