If you're downloading it into iPhoto, I don't think it does. You have to eyeball it. iPhoto only tells you if an image is shot in RAW mode. HDR is just a "moniker" Apple uses to mean that the picture is enhanced. It's really not truly "HDR" in the real sense. An HDR photo is usually obtained from a photo shot in RAW mode on a DSLR camera, and post-production is used to render the photo as HDR quality. So that' s why the HDR badge is not used in iPhoto, since HDR is usually meant as a post-production enhancement, and not an actual shooting "mode", per se. It's just a fancy selling tool for Apple, when all it does is adjust the ISO and brightness of the original photo for the most part.