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High dynamic range (HDR) is normally used with reference to a technique used to extend the range of luminances in an image. Typically a standard digital photo can only capture a range of about 8-12 exposure values (EVs), whereas the eye can see as many as 20 (and traditional film even less than a digital sensor). By sandwiching pictures of different exposures it is possible to extend the EVs associated with an image to create an HDR Image, and then use tone-mapping to render the image in a reproduceable format. On this page you can see some examples of pictures I have used HDR techniques on.