What is HDR photography?
High-dynamic-range imaging (HDRI or HDR) is a set of techniques used in
imaging and photography to reproduce a greater dynamic range of luminosity
than possible using standard digital imaging or photographic techniques. HDR
images can represent more accurately the range of intensity levels found in
real scenes, from direct sunlight to faint starlight.
Normal photographs have a limited exposure range, resulting in the loss of
detail in bright or dark areas. HDR compensates for this loss of detail by
capturing multiple photographs at different exposure levels and combining
them to produce a photograph representative of a broader tonal range.