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In photography and Image Processing HDR (High Dynamic Range) is a technique that allows a much greater range of light intensity from the lightest to the darkest area of an image than a regular image produced by a common camera. Tone mapping techniques aim to reduce the overall contrast so that an image with greater luminosity range can be displayed on devices that are not capable of showing that range while, at the same time, maintaining localized contrast. This can also be exaggerated in order to create artistic effects.
True high dynamic range photos can be obtained by capturing multiple shots of the same scene with different exposures and merging them in a software like HDRSoft