  The spectrum of the MeV tail detected in the black-hole candidate Cygnus X-1
remains controversial as it appeared much harder when observed with the
INTEGRAL Imager IBIS than with the INTEGRAL spectrometer SPI or CGRO. We
present an independent analysis of the spectra of Cygnus X-1 observed by IBIS
in the hard and soft states. We developed a new analysis software for the
PICsIT detector layer and for the Compton mode data of the IBIS instrument and
calibrated the idiosyncrasies of the PICsIT front-end electronics. The spectra
of Cygnus X-1 obtained for the hard and soft states with the INTEGRAL imager
IBIS are compatible with those obtained with the INTEGRAL spectrometer SPI,
with CGRO, and with the models that attribute the MeV hard tail either to
hybrid thermal/non-thermal Comptonisation or to synchrotron emission.
