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High-dynamic-range imaging – also referred to as HDRI or HDR photography – is a complex set of techniques that allow a greater dynamic range of exposures than normal digital imaging techniques.
Important aspects to be taken into consideration when capturing HDR or HDRI images include how the actual scene is, how the camera captures the scene, and how the scene ends us being displayed. Therefore, the high-dynamic-range imaging terms are often used in discussing tone mapping. That’s basically an image processing procedure to map a set of colors to another.