"theoldarchiver", I think you are onto something! In Aperture (advanced iPhoto), a particular photo gives me a File Size of 6.86 MB as file info for that photo. Toast reads 3.6 MB. (This photo was enhanced but not cropped.) If I re-export the same photo from Toast back to Aperture, its size changes to 3.9 MB (ignore this increase for now). Then, if I send this same photo back to Toast, it's size is 3.9 MB. What this says to me, and what you said, is that Toast is faithful to the real size it sees. Why Aperture inflates file size (in every photo) is a mystery to me. I am satisfied however, that Toast reads only what it sees. (For example, if I crop the photo, Aperture continues to show the entire original size while Toast doesn't.)