I can't see why all my photos have extremely different sizes. Whenever I export using JPEG format at Quality 12 in Aperture, some files would end up being of 2MB and some would be of 9MB, and some other would be 5MB. All of them come from RAW photos taken with the same camera (Nikon D40x). I am desperate because a competition I want to enter requieres images of at least 3MB of size in JPEG format. Any ideas why this happens? BTW, in RAW format, all of them are very similar. Around 8MB.