The invention relates to a method for producing a security feature by providing information as machine-readable graphic code, the graphic code in a real amplitude function of a two-dimensional, discrete complex function G (fx, fy) with an fx frequency coordinate and a fy-frequency coordinate is embedded, the two-dimensional, discrete, complex function G (fx, fy) is Fourier-transformed, a real partof a Fourier transform g (x, y) is determined, and the real part of the Fourier transform g (x, y ) is binarized into a two-dimensional image and the two-dimensional, binarized image (2) is printed,wherein a maximum frequency fx_max, fy_max and respectively a maximum attainable frequency fx_limit, fy_limit are determined along each frequency coordinate fx, fy along each coordinate Ratio Pfx = Pfx _max Pfx_limit, Pfy = P fx _max Pfy_limit of maximum used frequency and maximum achievable frequency is determined and the binarized image (2) is printed with a pixel resolution of at least the smaller of the two values and the binarized image (2) is used at least as part of the security feature.