Examples of generated mock clusters placed on a real background image, which is the same for all panels. The ages of the clusters are shown top of each panel. The mass and size, r_h, values are varied as shown on the axes; extinction A_V = 0 mag. The intensity scale of the images was normalized with the arcsinh function within identical pixel value limits for each image. The yellow circles represent r_h,  obs values (r_h convolved with the PSF). The value of the visibility, i.e., S/N proxy, is shown on the bottom left of each image for fainter objects with visibility <  100. Image sizes are 64 × 64 pixels (2.6 × 2.6 arcsec) or ∼60 × 60 pc at the distance of M 83. In the images red corresponds to passband F814W, green to F438W, and blue to F336W.