Image of Betelgeuse in the PAH2 filter before (left) and after (right) the subtraction of the PSF image derived from the observation of Aldebaran. The grey scale is a function of the square root of the intensity between 0 and 0.5 W m^-2 μm^-1 sr^-1. The black disk in the center corresponds to the non-linear and saturated part of the Betelgeuse image that was masked after the subtraction.