High Dynamic Range Images allow us to capture a virtually unlimited range of light intensities (from very dark to very bright) in a single image. This requires more than 8 bits of precision for each color channel, typically 16-32 bits per channel. We can create HDR images of real life by taking multiple images with different exposures and combining them. This can be done in Photoshop using File-Automate-Merge to HDR. Give it a try! Since we can't actually display HDR images on a computer monitor, we have to "tone map" it so that the aspects of the image that we are interested in are visible. HDR images are essential for realistic computer generated images mixed with live action. In the near future, HDR photography will be common place.
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