  We have used UV (FOCA) and FIR (IRAS) images of six nearby late type galaxies
to study the radial variation of the UV extinction (deduced from the FIR/UV
ratio). We compare the UV extinction gradient with other extinction indicators
(Balmer decrement) and search for a relation between the extinction, the
metallicity and the gas surface density among our galaxies. We detect in our
small sample a clear relation between extinction and metallicity. These
observed relations are used to calibrate an empirical recipe useful for
extinction correction in the UV, visible and near-infrared images of late type
galaxies.
