An example of a mock cluster drawn with GalSim, without (top panels) and with a random background from PHAT (bottom panels). Passbands are indicated at the top of each panel. A cluster with typical parameters of log₁₀(t/yr)=8.0, log₁₀(M/M_⊙)=3.0, and r_h = 0.6 arcsec is shown. The red circle of r_h radius encloses half of the stars of each cluster. The intensity of the images is normalized with the arcsinh function.