We explore two recent methods for measuring the Modeling Transfer Function of a printing system. We investigate the dependency on the amplitude when using the sinusoidal patches of the method proposed in and show that for too small amplitudes the measurement of the MTF is not trustworthy. For the method proposed in we discuss the underlying theory and in particular the use of a significance test for a statistical analysis. Finally we compare both methods with respect our application – the processing and printing of photographic images.