I think it's less. If I've got my files right locally, my Canon SL3, on RAW+JPEG, the JPEG is 7.4MiB and the JPEG embedded in the CR3 file (the "raw" file from

I think it's less. If I've got my files right locally, my Canon SL3, on RAW+JPEG, the JPEG is 7.4MiB and the JPEG embedded in the CR3 file (the "raw" file from Canons) is 2.3MiB. So, less. Between them, you can tell if you zoom in far enough (on the smaller one, there is clear artifacting) but it's they're both 24 MP photos so you have to get pretty close to the pixels to tell that. (I've only just gotten a decoder working on CR3 to the extent where I can extract those, though. One thing that hasn't changed since the OP is that camera manufacturers are still determined to making parsing their custom formats impossible by documenting absolutely nothing. Good hardware, terrible software.)