Predictions for 40-meter-class telescopes. Semi-resolved (g − r) color predictions as a function of μ_r for an old (10 Gyr) and solar metallicity population at a distance of 100 Mpc observed projected into a 5 milli-arcsec per pixel scale, emulating a typical stellar population as observed through a 40-meter-class telescope. The effect of the stochastic sampling of the IMF becomes evident at surface brightnesses as high as μ_r ∼ 19 mag arcsec⁻². Symbols are color-coded according to the number of stars in the semi-resolved FASTAR stellar population model.