Qtpfsgui is an open source graphical user interface application that aims to provide a workflow for HDR imaging. High Dynamic Range Imaging (HDRI) is a set of techniques that allow a far greater dynamic range of exposures (i.

e. a large range of values between light and dark areas) 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 the deepest shadows.