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HDRI – High Dynamic Range Imaging

In computer graphics and photography, high dynamic range imaging (HDRI) is a set of techniques that allow a far greater dynamic range of exposures (i.e. a large range of values between light and dark areas) than normal digital imaging techniques. The intention of HDRI is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to the deepest shadows.HDRI was originally developed for use with purely computer-generated images. Later, methods were developed to produce a HDR image from a set of photos taken with a range of exposures. With the rising popularity of digital cameras and easy to use desktop software, the term “HDR” is now popularly used[1] to refer to the process of tone mapping together bracketed exposures of normal digital images, giving the end result a high, often exaggerated dynamic range; however, in this case neither the input nor the output qualify as “true” HDRI.

from http://en.wikipedia.org/wiki/HDRI

Since I wasn’t able to bring any of my film cameras (specially my dear Mamiya RB ProSD) to get some decent out of the box dynamic range, because the Airports X-Ray screws up film pretty bad, I’ve decided to give digital, and HDRI in particular, a shot.

The shot on the left is a RAW file from a Canon 20D with very minor processing (the usual sharpness/contrast bit on RAW files), and the image on the right, is the same photo, HDRI version.

img_5997.thumbnail.jpg img_5997_hdmi.thumbnail.jpg

You can clearly see the difference on the dynamic range (much more detail in both highlight and shadow areas).

Oh… And FYI, this was the shot I took of the train where I traveled in when I got to Simpele (you can read all about it on the previous post).

posted by André Lemos in Photography and have Comment (1)

One Response to “HDRI – High Dynamic Range Imaging”

  1. Mytho says:

    O belo do HDR!!! =D

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