I believe the article above explained about HDRI can be more completed. When we talk about hdri, we must mention about Paul Debevec, he is the inventor of the HDRI format and also the ILM's openEXR format.
Here's some links, in case anyone of you are interested in this particular subjects.
http://www.debevec.org/
http://www.hdrlabs.com/sibl/index.html
http://www.mymentalray.com/index.php?option=com_content&view=article&id=98:the-artist-between-the-rays-christian-bloch&catid=47:interviews
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