摘自书籍：Advanced High Dynamic Range Imaging （second edition, 2018）
Francesco Banterle，Alessandro Artusi，Kurt Debattista，Alan Chalmers
CRC Press，Taylor & Francis Group
sRGB presents a non-linear transformation for each color channel to linearize the signal when displayed on LCD and CRT display. Such a nonlinear transformation is called an electro-optical transfer function (EOTF) in the standards community. Its inverse is typically called an opto-electrical transfer function (OETF). This is because there is a non-linear relationship
between the output intensity generated by the displaying device and the input voltage. This relationship is modeled as
where C is a color channel, γ = 2.4, and the subscript v means that the color channel is ready for visualization. Note that this equation has been derived from the gamma correction:
在高清电视中，ITU-R BT.2020给出了更宽的sRGB颜色范围，相应地，公式参数也有所不同。
HDR成像中，一些符号定义
亮度计算