Standard dynamic range

Standard Dynamic Range ( SDR ) describes the dynamic range of images or videos using a conventional gamma curve . This is based on the limitations of the first cathode ray tubes with a maximum brightness of 100 cd / m².

technology

The dynamic range that can be captured by the human eye in an image is around 14 f-stops . SDR images with a conventional gamma curve and a color depth of 8 bits have a dynamic range of around 6 f-stops. These are contained in BT.601 and BT.709. Professional SDR applications work with a 10-bit resolution and reach around 10 f-stops. One example of this is the SLog2 procedure.

Originally, linear gamma curves were used to reduce image noise in low light conditions. With the introduction of high dynamic range video , they are no longer needed.

An example of a conventional gamma curve in BT.601 is:

${\displaystyle E={\begin{cases}4.500L&L<0.018\\1.099L^{0.45}-0.099&L\geq 0.018\end{cases}}}$

See also

• Dynamic range
• Gamma correction
• High dynamic range
• ITU-R BT 601
• sRGB

Individual evidence

1. ↑ ^{a b c d} T. Borer: A "Display Independent" High Dynamic Range Television System (PDF), BBC . Retrieved February 2, 2016. 
2. ↑ Dolby Vision White Paper (PDF), Dolby Laboratories . Retrieved February 2, 2016. 
3. ^ Andrew Tarantola: How Dolby Vision Works, and How It Could Revolutionize TVs Forever , Gizmodo . June 24, 2015. Accessed February 2, 2016. 
4. ↑ ^{a b} Study Group Report High-Dynamic-Range (HDR) Imaging Ecosystem , Society of Motion Picture and Television Engineers. Retrieved February 2, 2016.