The High Dynamic Range Imaging Resource Page

In computer graphics and cinematography, high dynamic range imaging (HDRI for short) is a set of techniques that allow a far greater dynamic range of exposures than normal digital imaging techniques. The intention is to accurately represent the wide range of intensity levels found in real scenes, ranging from direct sunlight to the deepest shadows. Information stored in high dynamic range (HDR) images usually correspond to the physical values of luminance or radiance that can be observed in the real world. This is different to traditional digital images, which represent colors that should appear on a monitor or a paper print. Therefore HDR image formats are often called scene-referred, in contrast to traditional digital images, which are device-referred or output-referred. Furthermore, traditional images are usually corrected for the non-linearity of a display device or the human visual system, which is usually called gamma correction. Since HDR images do not assume any display device, they are not gamma corrected. The values they store are linear, which means that they represent relative or absolute values of radiance or luminance.


Page last updated on 15 November, 2005. pialpharhoalphagammaAT © Vision and Graphics Lab, Department of Computer Science & Engg., IIT Delhi, 2007
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