I'm not only talking about `RealGalaxy` objects.  Imagine you have a Sersic profile, and pixelized it at one scale.  You then wanted to see how it behaves when this image is projected onto a focal plane at another scale, i.e. including the original Pixel (not deconvolving it). I can't see a reason right now that I want to do that (simulating imaging of an image that itself comes from a digital projector?), but I also can't see why it should be prohibited.