Ohanaware, makers of the free HDRtist, have now produced a pro version of the software -- simply called HDRtist Pro -- that adds a new, more precise interface, direct saving to iPhone and Aperture, a 128-bit floating-point engine and tone-mapping system, and the ability to control and merge two different HDR techniques (exposure blending and tone-mapping) to create much more advanced High Dynamic Range (HDR) photos.
