Color correction factors f_c,1 (computed using method 1 from SPW11) for model atmospheres of two chemical compositions (pure hydrogen and solar hydrogen/helium mix with 30% of solar heavy-element abundance) and different log g as functions of the relative luminosity l (top panel) or g_rad/g (bottom panel). The new models based on the exact RF are shown by the solid curves, and the old models, based on the Kompaneets operator, by dashed curves.