Quote Originally Posted by freygr
There is a large difference between RAW, TIFF, BMP, and JPEG files. JPEG is a lossy compressed file. RAW, TIFF, and BMP you can insert a exe file and open and save as many times as you like, and as long as you do not edit or change any photo settings you can extract the exe and it will run just fine, its not possible using a JPEG. In just copy a photo, and open and save at least 10 times and then compare the original to the saved file side by side.
Sure it's possible with JPEG. Just because a photo starts out as a JPEG doesn't mean you have to keep it that way forever. When you get it onto your computer, and edit it, save it in a lossless format.