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High Dynamic Range imaging is about not losing information when capturing an image. If an object in an image is a million times brighter than another object (eg. the Sun and your face), then its pixel values should be a million times higher, and not just 255. This means that in dark shadows there is still some detail, and at the same time there is detail in the brightest parts of an image. Information loss is avoided during capture because the dynamic range of the HDR file formats are larger than the dynamic range of the scene. Therefore, High Dynamic Range imaging refers to a novel way of image acquisition capable of capturing real-world light. The fundamental idea is very simple: measure and capture the true luminosity information at the location (HDR imaging) and then back at home or at studio, once the output media is known (HDR viewing) decide about image composition, curves, tone mapping, etc. No more underexposed or overexposed images. High dynamic range images allow exposing after capturing the image! Click here to see HDR samples.
OpenEXR is a high dynamic-range (HDR) image file format developed by Industrial Light & Magic. OpenEXR is used by ILM on all motion pictures currently in production. The first movies to employ OpenEXR were Harry Potter and the Sorcerers Stone, Men in Black II, Gangs of New York, and Signs. Since then, OpenEXR has become ILM's main image file format. Tomahawk Desktop includes an OpenEXR type (.exr) viewer. You can adjust various settings and see how image looks like.
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