A new software for stellar photometry in crowded fields is presented. This software overcomes the limitations present in a traditional package like ROMAFOT when the pixel size of the detector is comparable to the scale length of point images. This is the case, for instance, with the Hubble Space Telescope-Wide Field Camera and, partially, with the Planetary Camera. The 'numerical' solution presented here is compared to the 'technical' solution of obtaining more exposures of the same field, each shifted by a fraction of pixel. This software will be available in MIDAS.
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Buonanno et al. (1989) studied this question.
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