High dynamic range
enhanced signal representation in images, videos, audio, or radio
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. It may also apply to the means of recording, processing, and reproducing such signals including analog and digitized signals.
Imaging
In this context, the term high dynamic range means there is a large amount of variation in light levels within a scene or an image. The dynamic range refers to the range of luminosity between the brightest area and the darkest area of that scene or image.
High-dynamic-range imaging (HDRI) refers to the set of imaging technologies and techniques that allow the dynamic range of images or videos to be increased. It covers the acquisition, creation, storage, distribution and display of images and videos.
Modern films have often been shot with cameras featuring a higher dynamic range, and legacy films can be post-converted even if manual intervention will be needed for some frames (as when black-and-white films are converted to color). Also, special effects, especially those that mix real and synthetic footage, require both HDR shooting and rendering. HDR video is also needed in applications that demand high accuracy for capturing temporal aspects of changes in the scene.
The public source identifies “High dynamic range” as enhanced signal representation in images, videos, audio, or radio. This brief keeps that definition visible, then builds a research path around High, dynamic and range.
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This entry incorporates text from “High dynamic range” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.