In image processing, computer graphics, and photography, high dynamic range imaging (HDRI) is a set of techniques that allows a greater dynamic range of exposures (the 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 shadows. [ Wikipedia]
To Create HDR images exists many applications that can help us with this technique, but many times that is commercial software and we need a license to use it, and also this software only can run in Microsoft Windows, for example Photoshop CS3, Photomatix, etc. Exist an image manipulator software called GIMP, but with this software, we can't to create HDR, only Exposure blended images, first because GIMP only work with 8 bits images and a HDR image require more than 8 bits.
In Linux you can to create HDR Images with QTPFSGUI, if you use ubuntu linux, only executing sudo apt-get install qtpfsgui you will have installed this software to create HDR Images, but is recommended download the software from http://qtpfsgui.sourceforge.net/download.php, it available for Windows, Linux and MacOSX.
The result with qtpfsgui is for example like the following images..
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