\begin{equation}
\begin{bmatrix} R_{out} \\ G_{out} \\ B_{out} \end{bmatrix} = \left( \begin{bmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{bmatrix} + \theta \begin{bmatrix} k_{RR} & k_{RG} & k_{RB} \\ k_{GR} & k_{GG} & k_{GB} \\ k_{BR} & k_{BG} & k_{BB} \end{bmatrix} \right) \begin{bmatrix} R_{in} \\ G_{in} \\ B_{in} \end{bmatrix}
\end{equation}

\begin{equation}
\begin{bmatrix}
R_{out} \\
G_{out} \\
B_{out}
\end{bmatrix}
=
\begin{bmatrix}
1 + k_{RR}\theta & k_{RG}\theta & k_{RB}\theta \\
k_{GR}\theta & 1 + k_{GG}\theta & k_{GB}\theta \\
k_{BR}\theta & k_{BG}\theta & 1 + k_{BB}\theta \\
\end{bmatrix}
\cdot
\begin{bmatrix}
R_{in} \\
G_{in} \\
B_{in}
\end{bmatrix}
\label{eq:color_drift}
\end{equation}