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in simple context, High Dynamic Range (HDR) basically allows you to better represent the image's lighting, in certain situations, or give the image more detail. so if you have a low contrast image (low colour quality) with some HDR toning you can give it more colour and detail
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Hoogle
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true HDR features a mixture of 3 or more exposures of the same image for example you set your camera up if it is a DSLR you enable auto bracketing where when you take the picture it will actually take 3 images 1 with correct exposure, 1 with an underexposed normally by 1 or 2 stops and the 3rd over exposed also by 1 or 2 stops. You can use photo editing software like photoshop or HDR effex pro and load up the 3 images and blend them to make 1. the lighting from different exposures can all be edited so you can choose which 1 suits best and layer it up. However you can use a photoshop plugin that will attempt to recreate this from 1 image but will never be as good as 3 raw images merged together.