HDR Photography

In image processing, computer graphics, and photography, high dynamic range imaging (HDRI or just HDR) is a set of techniques that allows a greater dynamic range of luminances between light and dark areas of a scene than normal digital imaging techniques. The intention of HDRI is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows

Qtpfsgui - Despite the horrendous name, this tool is completely open source and offers a free way to start a HDR workflow.
Qtpfsgui Website