This paper presents an alternative procedure which extracts spectra from IUE low resolution images. The -by-line image is scanned perpendicularly to the direction of dispersion . The resulting cross-cuts are then fitted with a known-form analytical function, which consists of a linear base-line describing the background plus as many bands as there are spectra in the image under study. At each wavelength point the value of the spectrum is assumed to be the area of the corresponding band. A proper choice of the band profile allows us to recover the light scattered perpendicularly to the direction of dispersion, due to the "halation" effect in the on-board UV-to-visible image converter. In such a way a more correct extracting procedure is achieved. It furnishes noticeably better results than the standard VILSPA extracting routine in the case of highly exposed images. As a by-product, some properties of the Point Spread Function perpendicular to the direction of dispersion are determined.