The calibration routine in the Autostar Image Processing never divides flats correctly for me. It always 'over-corrects', in fact usually by stressing the background inhomogeneity (e.g. due to vignetting) and enhancing dust rings rather than removing them. This has to do with the application of the wrong scaling factors. Can anyone give details about the algorithm implemented by meade to do the flat division? One could of course reduce the flat's gain manually by trial and error or by adjusting the illumination but that would really be tedious. I've tried it with ImageJ and it does do the job, but only after fiddling with it for a rather long time.
Any help is greatly appreciated.
flats and how to apply them in Autostar IP
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