Making Pictures Using High Dynamic Range Techniques

Laurie asked about HDR images in my first post on my London trip yesterday. Here is a very brief explanation on making HDR images.

HDR stands for High Dynamic Range and is a technique for manipulating digital photographs in a way that it shows a wider dynamic range of exposures. The simplest way to describe is this: you take three identical shots of a picture with different exposure settings and then use a software to tone map the images into a single image which combines the best of each of the three images. Know what I mean?

I just went out this afternoon to take some pictures to demonstrate this technique. Here is the typical picture I took with my camera with the setting set to “P” (auto mode). The picture is not bad. However, you notice the following … the tree at the back is under exposed and looked dark. The pine needles on the ground were over exposed giving a light orangey tone and the grass in the background was over exposed.

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By manipulating the picture I get the following results: The tree in the back, the pine needles on the ground and the grass in the background is now properly exposed. Can you see the difference? It’s kind of hard to see the real difference with this daylight shot. So, how was this done?

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Well, like I said, I take three shots of the scene with the following stops -2, 0 and +2. My camera is equipped to take such Exposure Bracketed shots. Basically, I take one shot with 2 stops under exposed, one at normal exposure and another with 2 stops over exposed … like this:

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