  We study how the energy and momentum resolution of angle-resolved
photoemission spectroscopy (ARPES) affects the linewidth, Fermi crossing,
velocity, and curvature of the measured band structure. Based on the fact that
the resolution smooths out the spectra, acting as a low-pass filter, we develop
an iterative simulation scheme that compensates for resolution effects and
allows the fundamental physical parameters to be accurately extracted. By
simulating a parabolic band structure of Fermi-liquid quasiparticles, we show
that this method works for an energy resolution up to 100 meV and a momentum
resolution equal to twice the energy resolution scaled by the Fermi velocity.
Our analysis acquires particular relevance in the hard and soft x-ray regimes,
where a degraded resolution limits the accuracy of the extracted physical
parameters, making it possible to study how the electronic excitations are
modified when the ARPES probing depth increases beyond the surface.
