The difficulty comes when we need to display an HDR image on media that can’t display this high dynamic range, such as a screen or a sheet of paper. We don’t wish to delve into the technicalities, but the result is that an HDR image allows for each pixel to contain practically any exposure value, so if the difference between the the darkest and lightest parts of an image is 20 stops, this will be faithfully preserved in the HDR’s file format.
An HDR image uses 32 bits per pixel, and these bits are used to store a floating-point value. To create an HDR image several exposures are also used, but the similarity stops there. Note that this is not the same as creating an HDR (high dynamic range) image. I took several shots at different exposures and then blended them together directly from within Lightroom using my LR/Enfuse plugin.Įxposure blending essentially involves examing a group of photos with varying exposures and creating a final photo, pixel by pixel, by choosing the best exposed pixel from all of the photos. Normally we would expect most of the room to fall into shadow due to the high constrast difference between the window-lit table and the shaded corridor so how was this avoided? The shot is taken using ambient light only, and yet everything is well exposed from the forground table right through to the back of the room. You may have seen the me mention this photo in a previous post.
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