Template:Glapi srgb equation

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c_l =
\begin{cases}
 \tfrac{c_s}{12.92}, & \text{if }c_s \le 0.04045 \\
 \left ( \tfrac{c_s + 0.055}{1.055} \right )^{2.4}, & \text{if }c_s > 0.04045
\end{cases}