Does GREYCstoration depend on scale?

[David Serrano]

I'm killing the noise in this Corona Borealis shot:



With the parameters that can be seen there, this is the result for the first preview:



Pretty poor indeed, but in p02 things do change:



Wow, we're improving, although I can't understand why. I thought this tool gave the same results regardless the size of the view. If applying on p03 we get:



Pretty much the same, although a couple of faint stars are no longer there. Not good… then, applying to the whole image:



Lots of stars go away .

Now, I'm aware that some processes like HDRMultiscaleTransform are scale-sensitive and it's pointless to use previews with them. But I've always regarded GRECYstoration as not falling into this category so I'm pretty surprised (and mystified) by these results. Is there any plausible explanation for this?

FWIW, I'm running with 'parallel --disable' because of this, which I'm still experiencing in PixInsight 1.8.

[Carlos Milovic]

I know that I'm not going to solve your question, but... Why are you using GREYCstoration? TGVDenoise should by way better for this job.

[David Serrano]

I know that I'm not going to solve your question, but... Why are you using GREYCstoration? TGVDenoise should by way better for this job.

I'm finding I don't like TGVDenoise's results that much. "It's a poor workman who blames his tools" yeah, I guess the workman will have to improve —it's a new tool after all. For completeness, I must say that GREYCstoration worked fine on the next day with a different image. I'll have to try again with this one...