Example of the K-correction process. The composite stellar population model (from Paper I) is shown as a black line. The green triangles represent the integrated flux of the galaxy in each HST band. The pink circles are the expected flux in each HST band, considering only the stellar population model. The gray dots are the expected U, V and J fluxes considering the model. The K-correction is the difference between these fluxes and the expected values in the nearest HST filters.