CMD for all sources in the M 49 Suprime Cam field. Objects below the horizontal line are emission line objects with an EW_obs> 110 Å and colour excess. The solid (dashed) blue lines indicate the regions above which 99.9% (99%) of simulated continuum objects fall. Objects fainter than the limiting magnitude fall into the grey region. The candidate PNe from the automatic selection are denoted by crosses and those confirmed by visual inspection of the images by red dots.