Comparison of photometric and spectroscopic metallicities for the full followed-up sample of stars. The left panel shows the photometric metallicities obtained using the Pristine-Gaia synthetic (XP spectra) vs the spectroscopic metallicities derived from the calcium triplet equivalent widths for the entire sample. A small subset of the sample also has photometric metallicities derived from higher S/N Pristine CaHK magnitudes, which are shown in the right panel vs the spectroscopic follow-up metallicities. Median uncertainties in bins of 0.5 dex in photometric [Fe/H] is shown in both panels. The uncertainties increase with decreasing metallicities in general, but the first and last bins are affected by low number statistics and do not follow this trend.