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See High Dynamic Range.
High dynamic range (HDR) processing is a technique achieved using software that takes the best tones from several exposures and combines them in one HDR image. The dynamic range is the range of brightness levels in a recorded scene from the darkest shadows to the brightest highlights. This is typically measured in f/stops and has always been a problem for film users shooting on colour transparency film, especially on films such as Fuji Velvia. The dynamic range is around six f/stops from the brightest to darkest points. And while colour negative and black & white film users have always had a few stops to play with, even at a maximum of around nine stops most photographic systems struggle with high contrasts scenes. Several software programs offer the possibility of combining differently exposed shots to one high dynamic range (HDR) image. Also see "High Dynamic Range explained technique".