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The task, omphotom, is intended for interactive photometry. It does not have a graphical user interface, but it runs from the command line.
omphotom allows the user to recompute the photometry of one or several sources in a list previously obtained with omichain. The aperture and background regions definition can be modified. For crowded fields, a least squares fit to the PSF can be done. This can give better results than the standard mode used in omichain.
The task can accept as input a parameter file that allows specifying several input images and the corresponding source files. This allows batch processing of many exposures in the same observation.
Potential users are referred to the on-line documentation for omphotom.