When the dynamic range of a scene is beyond the gamut of a single exposure, Hydra can use multiple (different) exposures of the same scene (up to 4) and blend them into one image.
Unlike some HDR (high dynamic range) programs, Hydra does not require the use of a tripod to insure pixel-to-pixel matching of images. Instead, a method of matching key points in the images is utilized. For many example, see the Flickr HDR Pool.
Hydra is available as a demo, and can be purchased for $59.95.
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