Quote:
Originally Posted by ericwbenson
It presumes (very important clause here, because it's not always right!) that the math that transforms the crappy PSF into the desired perfectly shaped/narrower gaussian also applies to your nebula etc.
EB
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Thanks Eric. That's a key assumption of deconvolution that Mike alluded to earlier.
Under what circumstances will deconvolution apply to stars but not to nebulae etc in the same image? - apart from the obvious and manageable issue of non-linearity/saturation.
EDIT: I guess the basic question is, which algorithms employ constraints that work against extended structures. My understanding is that some of the radio astronomy algorithms do so, but that the algorithms widely used in optical system are equally as capable of effective deconvolution on nebulae/galaxies as on stars. The widely used Ricardson-Lucy and van Cittert for example are fine for extended objects and will work properly using measured star profiles directly as PSFs for deconvolution on nebulae and galaxies.