save both normal and HDR photo

Hi all
I need to save both normal( i mean SDR exactly) photo and its corresponding HDR photo.
iphone mobiles have this kind of ability that u can save both normal and HDR photo of a scene.
there are applications that save 3 SDR photos and those corresponding HDR. I do not need this. I just want 1 normal photo and its corresponding HDR photo.
please, any one who can help me with any kind of idea, I would be gratefull.