sRGB

原色色度点

$ V = \left\{ \begin{array}{ll} 12.92L & L < 0.0031308 \\ 1.055 L^{\frac{1.0}{2.4}} - 0.055 & L \geq 0.0031308 \end{array} \right.

code:glsl

vec3 linearToSRGB(vec3 l) {

return mix(

12.92 * l,

1.055 * pow(l, vec3(1.0 / 2.4)) - 0.055,

step(0.0031308, l)

);

}

https://gyazo.com/6083a4fb9fca5502c9164ad7bcf1d9ca

$ L = \left\{ \begin{array}{ll} \frac{V}{12.92} & V < 0.04045 \\ \left( \frac{V + 0.055}{1.055} \right)^{2.4} & V \geq 0.04045 \end{array} \right.

code:glsl

vec3 sRGBToLinear(vec3 v) {

return mix(

v / 12.92,

pow((v + 0.055) / 1.055, vec3(2.4)),

step(0.04045, v)

);

}

https://gyazo.com/e4d0750c5c9928747485e054a67002a5

Gamma 2.2での近似