RGB颜色空间转换小笔记

早过忘川 提交于 2020-02-09 14:06:52

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

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