Standard-dynamic-range video

Transfer function Conventional gamma curves: • Opto-electronic transfer function (OETF): • Rec. 601 (analog video signals in SD-TV digital video form) • Rec. 709 (HD-TV) The linear part of the conventional gamma curve was used to limit camera noise in low light video but is no longer needed with high dynamic range (HDR) cameras. HDR standards such as hybrid log–gamma (HLG) and SMPTE ST 2084 allow for a larger dynamic range by using a different transfer function. Color gamut In some cases the term SDR is also used with a meaning including the standard color gamut (i.e. Rec. 709 / sRGB color primaries). Dynamic range The dynamic range that can be perceived by the human eye in a single image is around 14 stops. SDR video with a conventional gamma curve and a bit depth of 8-bits per sample has a dynamic range of about 6 stops, assuming a luminance quantisation threshold of 5% is used. A threshold of 5% is used in the paper (instead of the standard 2% threshold) to allow for the typical display being dimmer than ideal. Professional SDR video with a bit depth of 10-bits per sample has a dynamic range of about 10 stops. ==Displaying SDR video on modern displays==

While conventional gamma curves are useful for low light and are compatible with CRT displays, they can only represent a limited dynamic range. Standards require SDR to be viewed on a display with the same characteristics as a CRT (i.e. 100 nits peak brightness, gamma curve, Rec. 709 color primaries). However, current displays are often far more capable than CRT's limits. On such displays, higher brightness and wider color gamut can be displayed by adjusting and trying to enhance the SDR picture. HDR is however required for the creative intents to be preserved. ==References==