An exact method of the evaluation of the effects of the finite spatial resolution of the recording material on the reconstructed holographic image is presented in this paper. The method is based on substitution of the amplitude transfer function (the square root of the modulation transfer function) of the recording material modelled by analytical function to the double Fresnel-Kirchhoff integral. Numerical calculations have been carried out for microline objects in three recording geometries, including one with a tilted object plane.