I just recently discovered HDR photos. I have been reading up on them online. From what I understand you need to take several images at different ranges to get all the different values, then you basically merge them all to get a dynamic range of values. My question is, is there a way to do an HDR from one RAW photograph? The reason I ask is what if you want to take a picture of a person or a subject that is not stationary. Can you just take one RAW photo and adjust the levels and save it several times, then make one HDR?