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HDR imaging and HDR video are different techniques to produce more dynamic range. HDR imaging is compositing multiple images and using tone mapping to fit more
by ianburrell 9y ago
HDR imaging and HDR video are different techniques to produce more dynamic range. HDR imaging is compositing multiple images and using tone mapping to fit more dynamic range into regular image. If have a HDR display that can show the extra dynamic range, then don't need to do the tone mapping which tends to be the fake looking part.
HDR video is usually recorded with the higher range. Are there videos where high dynamic range is compressed into standard dynamic range? Or where HDR is synthesized from regular video?
- zero_one_one 9y agoMost of the TV and movies you've been watching since things went digital are cases where 'high dynamic range' has been jammed into a standard dynamic range container (most features and high-end drama would shoot either raw or record sensor data using some form of logarithmic transfer function to maximize the amount of information per bit or encoding). All information coming from the debayered raw or camera's widest 'record gamut' that's outside of the Rec.709 (or P3 for cinema) colourspace has simply been mapped down to an equivalent Rec. 709 / P3 value via a Look Up Table, graded down to fit within the output gamut, or simply clamped/thrown away. HDR now gives a lot more to play with from a post production standpoint (when shot raw or using some logarithmic transfer function to encode the sensor data), as more of the picture information coming off the camera sensor can be utilised (where exposure, recording format and compression allow)