A portion of the Galactic open cluster NGC 2420 imaged by GALEX; detected sources as defined by the standard pipeline are outlined in pink, and those from our custom photometry (de Martino et al. 2008) are in green. The example illustrates the case of some crowded pointlike sources being merged by the pipeline into one extended source. In the outskirts of the cluster, which is less crowded, the pipeline source identification matches ours very well.