HyperGal models fully chromatic scenes by using pre-transient photometric images to generate a hyperspectral representation of a host galaxy. It applies the CIGALE SED fitter (ascl:1111.004) as a physically motivated spectral interpolator to construct the galaxy model. The galaxy model, complemented by a point source and a diffuse background component, is projected onto the SEDm spectro-spatial observation space and adjusted to observations.