In this paper, it is shown theoretically and verified experimentally that the modulation transfer function (MTF) and phase
transfer function (PTF) of a printer can be evaluated simultaneously by measuring convolution of transmission function
of a couple of printed Ronchi gratings. In practice, two similar printed Ronchi gratings are superimposed inversely to
create the Moiré fringes. By measuring the transmittance of moiré fringes, the convolution function can be obtained.
Using the latter function, the PTF can be evaluated in addition to MTF, but the measurement of the autocorrelation
function of the gratings results in the MTF only. In fact, as superiority this technique does not require a high sensitive
detector and a very narrow slit.