High dynamic range photos
May 25, 2009
Some of you may have heard of the term, but if you’re not into photography there’s a good chance you don’t know exactly what high dynamic range (HDR) photos are. Simply put, the goal of the HDR technique is to expand the dynamic range (difference between the light and dark areas) of the image so that it’s closer to what the human eye sees. Camera sensors, although constantly being improved upon, still can’t match the range between detail in light and dark areas as well as your eyeballs. If a scene has something in direct sunlight and something else in deep shadow, you’re going to lose detail in one or both areas when you rely on just one exposure.
To solve that problem, the premise of HDR is simple: take several exposures of the same scene, one for the darkest areas, one for the lightest areas, and one or more in between, and then combine them in post-processing so that all areas of the final image have detail and are not blocked out (shadows) or blown out (highlights).
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