1. Method ( 30 ) for simulating reduction of acquisition dosage of an X-ray image, comprising providing ( 32 ) first X-ray image information comprising first noise, the first X-ray image information having been acquired with a first dosage setting; providing ( 34 ) a second dosage setting; determining ( 36 a ) a noise difference for obtaining simulated second X-ray image information acquired with the second dosage setting; and applying ( 38 ) the noise difference to the first X-ray image information for obtaining the simulated second X-ray image information comprising second noise; wherein the noise difference is at least partly dependent on at least one of a coloring of the first noise, a noise power spectra of the first noise, a coloring of the noise difference, a power spectra of the noise difference, an intensity distribution of the first X-ray image information and a local intensity distribution of the first X-ray image information.