Viewing HDR images in your Camera Roll
By default, when you shoot an image with HDR turned on, your device keeps both photos — the original unaltered image, and the merged HDR photo. If you'd prefer to not keep the original image, open up the Settings App and go to Photos & Camera > Keep Normal Photo. Disable the switch, and when you next take an HDR photo, only the altered version will appear in your Camera Roll. Personally, I like to keep this enabled, as having both versions allows me to compare and contrast, to decide if I should take a new shot.
To tell the difference between your normal and HDR images in your Camera Roll, look for the HDR image marker — when you tap on an altered image, you'll see a slightly opaque icon in the upper left corner of the image that says "HDR."
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