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Tone mapped high-dynamic-range (HDR) image of St. Kentigern's Church in Blackpool, Lancashire, England. In photography and videography, multi-exposure HDR capture is a technique that creates high dynamic range (HDR) images (or extended dynamic range images) by taking and combining multiple exposures of the same subject matter at different exposures.
Multi-image as a business thrived during the 1970s and 1980s. Multi-image presentations ranged from single projector shows run by projector-viewer [3] to large events for business meetings and conventions where multiple shows would be presented and often were rear-projected by 24 or more projectors.
High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual. The term is often used in discussing the dynamic ranges of images , videos , audio or radio .
Digital photography allows the quick collection of a large quantity of archival documents, bringing convenience, lower cost, and increased flexibility in using the documents. [12] There are some areas where film may have some advantages. Modern film cameras are not as power-thirsty as modern digital cameras and can last longer on smaller batteries.
Computational photography can improve the capabilities of a camera, or introduce features that were not possible at all with film-based photography, or reduce the cost or size of camera elements. Examples of computational photography include in-camera computation of digital panoramas , [ 6 ] high-dynamic-range images , and light field cameras .
This makes most chemical-based photography a two-step process, which uses negative film and ordinary processing. Special films and development processes have been devised so that positive images can be created directly on the film; these are called positive, or slide, or (perhaps confusingly) reversal films and reversal processing.