High Dynamic Range format is used for post-processing, it features 32 bit per channel per pixelt, this color range can't be viewed completely on most monitors. It became popular among photo enthusiasts because of the fact that it actually combines multiple photographs taken with different exposures. You can use postprocessing for some high dynamic range scenes to get the most natural looking pictures with the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows.

Information stored in high dynamic range images usually corresponds to the physical values of luminance or radiance that can be observed in the real world. It allows a greater range of values between light and dark areas than normal digital imaging techniques.

Reasoft ReaConverter uses some tone mapping algorythm to output JPEG format files with 8 bit per channel color range.