answer:Importing your photos to iPhoto should not actually edit, compress or change the photo files in any way. It merely copies your photos to a specified place on your Mac’s hard drive, and creates a thumbnail of the photo. One possibility is that you are accessing the thumbnails that iPhoto creats rather than the actual file. How are you accessing the files? If you want to stop iPhoto from opening automatically every time you connect your camera, go to iPhoto in the top menu, then Preferences. Under “Connecting camera opens:” select “No application.”