![]() ![]() Due to the limitations of printing and display contrast, the extended luminosity range of input HDR images has to be compressed to be made visible. HDR images can also be acquired using special image sensors, such as an oversampled binary image sensor. The two primary types of HDR images are computer renderings and images resulting from merging multiple low-dynamic-range (LDR) or standard-dynamic-range (SDR) photographs. High-dynamic-range (HDR) images are often created by capturing and then combining several different, narrower range, exposures of the same subject matter. HDR is useful for recording many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. ![]() The ratio between the maximum and the minimum of the tonal value in an image is known as the dynamic range. Outside this range, no features are visible because in the brighter areas everything appears pure white, and pure black in the darker areas. Standard techniques allow differentiation only within a certain range of brightness. In photography and videography, HDR or high-dynamic-range imaging is the set of techniques used to reproduce a greater range of luminosity than that which is possible with standard photographic techniques. Kentigern's Church in Blackpool, Lancashire, England Tone mapped high-dynamic-range (HDR) image of St. ![]()
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