1. A method for indicating differentiation between tissues of a subject, comprising: in a computer, identifying multiple tissues in a subject and, for each tissue among said multiple tissues, executing a simulation comprising a random scan sequence, wherein a magnetic resonance scan of each tissue is simulated with a selected parameter of the scan being randomly varied so as to have different parameter values and in which, as a result of the different parameter values, the respective tissue is given a magnetization vector in the simulation; in said computer, dependent on the respective magnetization vectors for each of the multiple tissue, calculating a differentiation-indicating value between each pair of tissues among said multiple tissues; in said computer, simulating a pair of brightness curves for each said pair of tissues among said multiple tissues and using the respective differentiation-indicating values to differentiate between each pair of brightness curves, and thereby obtaining a differentiation for each pair of brightness curves; and in said computer, based on said differentiation, selecting a magnetic resonance fingerprinting (MRF) protocol for scanning the multiple tissues, and making said MRF protocol available from the computer in electronic form with a format configured to operate a magnetic resonance imaging apparatus in order to execute the selected MRF protocol.