3 Specific Settings Our model generalizes WM18, which can be realized by setting M = I 3 and β = m. Another interesting instance of the model is obtained by setting M = (1 − α m )I 3 and β = α m m, which we call the Diagonal Covariance (DC) model.
to the RGB model and WM18, which model m as a function of r and m, m in the DC model does not depend on r. Given r and m, to predict the t, our DC model predicts m first and then applies a linear transformation to get the target color vector as follows: is a scalar which only depends on m and measures the distance from r to m. In the DC model m is the interpolation point for modifiers, such as 0 0 0 for the modifier "darker".