HDR capture from multiple exposures
In photography and videography, it's possible to capture high dynamic range (HDR) images by taking and then combining several different exposures of the same subject matter.
Images captured from a single exposure allow differentiation only within a certain range of brightness. Outside this range, no features are visible because in the brighter areas everything appears pure white, and pure black in the darker areas. The ratio between the maximum and the minimum of the tonal value in an image is known as the dynamic range. Combining several different, narrower range, exposures of the same subject matter results in an image with a greater dynamic range. HDR is useful for recording many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae.[1][2][3][4]
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. The method of rendering an HDR image to a standard monitor or printing device is called tone mapping. This method reduces the overall contrast of an HDR image to facilitate display on devices or printouts with lower dynamic range, and can be applied to produce images with preserved local contrast (or exaggerated for artistic effect).
The term "HDR" may also refer to the overall process of capturing HDR images from multiple exposures. Many smartphones have a built-in HDR feature performing the process in an automated way for photo capture. This HDR technique can also be used to capture video by taking and combining multiple exposures for each frame of the video.
References
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<ref>tag; no text was provided for refs namedmann1995 - ↑ Reinhard, Erik; Ward, Greg; Pattanaik, Sumanta; Debevec, Paul (2005). High Dynamic Range Imaging: Acquisition, Display, and Image-based Lighting. Amsterdam: Elsevier / Morgan Kaufmann. p. 7. ISBN 978-0-12-585263-0.
Images that store a depiction of the scene in a range of intensities commensurate with the scene are what we call HDR, or 'radiance maps'. On the other hand, we call images suitable for display with current display technology LDR.
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- ↑ Banterle, Francesco; Artusi, Alessandro; Debattista, Kurt; Chalmers, Alan (2011). Advanced High Dynamic Range Imaging: Theory and Practice. AK Peters / CRC Press. ISBN 978-156881-719-4. Search this book on
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