I know the theory behind HDR is to take a series of images at different exposures and combine them to get a high dynamic range but...
If I have only one image (in RAW format) and I create 3 images from it, each at different exposures i.e. -1, 0 and +1 by modifying the exposure in adobe RAW and then combined in adobe elements for example, then surely this is the same as HDR with multiple exposure images taken from a camera? Or have I over simplified things? Is it that modifying the exposure in a RAW image is not quite the same as setting a particular exposure in camera?
I'm sure there's a good reason why camera's have exposure bracketing etc I just wondered if I can cheat so to speak since HDR does require keeping the camera still using a tripod which I rarely carry with me.
Thanks in advance