... Through Stromgren uvby photometry, we determine ages, metallicities, Ё and the luminosity function. ... A comparison verifies improved photometric quality for dithered versus undithered images. ... Figure 1 shows a set of calibration exp osures (with two stars) using the StrЁ gren uvby filters. ... We compare a simulated image to an observed one. ... Figure 7 shows the statistical differences b etween histograms derived from the real image, with a background level of 355 ADU, and two simulated...