IPhone :: ITunes Changing Resolution Of Photos

If you take a pic with the camera it lands in the camera roll. If I email it I get the option to send the "Original" (2592x1936 @ 72dpi). If I then take it out of the camera roll and copy it to a folder that syncs back to the phone and I try to email it, it then shows the original as 2056x1536 @ 72dpi. The original on the computer stays at the original resolution of 2592x1936 but iTunes re-reses it on the fly. Does anyone know of a way to stop iTunes from optimizing (changing the resolution) of the photos being copied back? I like to keep the camera roll empty and reorganizing the photos into folders.