A couple nights ago, I started editing an image in Photoshop cs5, camera raw (it's a jpeg image). It got late, and I didn't like where the look was going, so I called it quits for the night. I just tried to open the original image again to start from scratch, but it goes right back to the 'bad version' I had been working on. I can open it in photoshop and see the original shot, but not camera raw. Is there some way to revert all my changes back to original in RAW?