Comparison of our photometry (transformed to UBVR_cI_c magnitudes using the equations from Smith et al. 2002) with B_tot from ISIB96 and with magnitudes for several bright galaxies retrieved from NED. Top left: Difference ΔB(our − Impey) vs. B_tot from ISIB96. The filled circles denote galaxies that, according to ISIB96, had CCD photometry as opposed to have been measured on photographic plates. Top right: ΔB(Impey − NED) vs. B(NED). The filled circles show all galaxies in ISIB96 and NED in common. The comparison of ISIB96 photometry with the magnitudes from Salzer et al. (1989) is shown with asterisks. Bottom left: Comparison of our photometry (transformed to UVR_cI_c) with the magnitudes from NED. Bottom right: ΔB(our − NED) vs. B(NED). The galaxies from ISIB96 are shown by filled circles, while the additional galaxies that we found in the test sample fields are shown by open circles. The comparison of our photometry with the magnitudes from Salzer et al. (1989) is shown with asterisks.