I had many family photos/slides that were scanned to jpegs and was looking for some way to label them internally so the info could never be separated from the images. I found an excellent free program (Zoner Photo Studio) at
http://www.zoner.com/. While I have no idea what the camera settings were, at least I can record when/where the original was taken and who/what was in it.
If you are using an older camera that doesn't automatically insert the exposure data (and you know what it is), you can also add that manually. as well.