In the RBM that uses the RGB color space, the best couple of parameters proposed by the authors is (3, 100). In contrast, as the perceptual color spaces have different shapes in comparison with the RGB color space, we must estimate the more suitable parameters for them. The evaluation of the best combination of parameters is carried out using the 300 training images taken from the BSDS500 and are quantitatively assessed with the PRI, BDE, and GCE measures. We have exhaustively searched for the best window size $W$ in the set ${3,5,7,9,11}$ and the expanse Ex in the set ${50,100,150,\u2026,400}$. We have found that the best parameters for the RGB space using our method are (5, 150). In the case of the CIELab space, the best set is (7, 150). Using the CIELuv color space, the best parameters found are (5, 300).