ITU-R Recommendation 709, usually abbreviated Rec. 709, BT.709, or ITU-R 709, is a standard developed by the Radiocommunication Sector of the International Telecommunication Union (ITU-R) for image encoding and signal characteristics of high-definition television (HDTV). [3]

2022年1月12日 · You should not use Rec709 TRC for a display. If you want to show Rec709 content you usually want 2.2-2.4-rec1886 on display (or LUT3D) depending on final target media and contrast of your display. Ah I see, I was misguided then. What tone curve, white point and white level do you recommend for general use?

Diagram of the CIE 1931 color space that shows the Rec. 2020 (UHDTV) color space in the outer triangle and Rec. 709 (HDTV) color space in the inner triangle. Both Rec. 2020 and Rec. 709 use Illuminant D65 for the white point. An illuminant is characterized by its relative spectral power distribution (SPD).

2024年11月22日 · A Rec.709 monitor allows creatives to utilize a color gamut that resembles real-world colors captured from cameras that record HD content or HDR content. It makes images look realistic, baking colors into the image for better color grading and colors the human eyes can see.

Rec709的标准白点是D65，可以基本理解为6500k的色温，但这是基于经过大气折射的日光色而不是绝对黑体加热后发出的原始颜色，有细微的不同。 那么上面两行讲的是什么呢？第一行就是说系统会假设输入的亮度值为线性，这个值最低为0，最高为1，然后再第二行它使用了一种算法把这个亮度值转换为电信号进行输出，同样最低为0，最高为1。为什么需要这个算法呢？这就涉及到一些关于gamma的知识。我个人感觉很多网上对于gamma的解读只讲了一半，有时候甚至会混淆 …

Use Contrast pattern (near-white) to ensure no clipping is occurring as the signal approaches reference white video level. Adjust using RGB gain and/or RGB bias to achieve desired white point and luminance at each greyscale level.

2016年5月16日 · The white point of the colorspaces defined in Rec. 709 and Rec. 2020 is D65. The XYZ encoding for digital cinema allows a variable white point. I provide three different profiles for the digital cinema P3 color space with white points of D65, D60, and DCI.

2023年4月11日 · Rec. 709 specifies the parameters for the color primaries and white point for the video. These parameters define the range of colors that can be displayed or captured by a video system. The color primaries in Rec. 709 are defined using CIE xy chromaticity coordinates, with a white point at D65 (6500K color temperature).

Rec.709 is a specification standard released by the ITU-R which includes a unique color gamut as part of their wider “list” of specifications. Though strictly speaking Rec.709 is a set of specifications that covers items beyond color gamut, it’s common to be mainly referring to its color gamut when using the term “Rec.709”.

Figure 2a below shows 21 Reference Colors for the Standard sRGB / Rec.709 Color Gamut as White, Gray, and Black circles. The 10 Black circles are the 100 percent fully saturated colors on the periphery of the Gamut triangle.