Redshift measurements are used in astrophysics to measure distances and to constrain fundamental cosmological quantities. Although spectroscopic redshifts (spec-z) are much more reliable than photometric redshifts (photo-z), they are much more difficult or time-consuming to obtain. We seek to optimize photo-z measurements, i.e. bring their values closer to the "true" spec-z values, by using a tool called BPZ. We investigate the changes in photo-z resulting from modified galaxy templates using the SDSS catalogue of galaxies. We also consider the effect of adding artificial noise to galaxy spectra. The photo-z values were most improved when the templates contained emission lines, and noise of the same degree as in the catalogue
