High-dynamic-range imaging (
HDRI or
HDR) is a technique used in imaging and
photography to reproduce a greater
dynamic range of
luminosity than is possible with standard digital imaging or photographic techniques. The aim is to present the
human eye with a similar range of
luminance as that which, through the
visual system, is familiar in everyday life. The human eye, through
adaptation of the
iris (and other methods) adjusts constantly to the broad dynamic changes ubiquitous in our environment. The brain continuously interprets this information so that most of us can see in a wide range of light conditions. Most cameras, on the other hand, cannot.