HRDtist is a simple, fun program for the beginning HDR photography artist. It has only one control, a slider, which sets one of four tone mapping algorithms (or a blend of any two contiguous algorithms). The Save command is slow as the program apparently re-renders the blended image, re-applies the chosen algorithm, and writes to disk. (Ref: 24" iMac 2.8 GHz Intel Core Duo Extreme). Fun to use for quick looks but if you need more control, look to other products.