Jupiter Sept 22nd f31

[Space Cowboy]

Thanks again fellas!

Don't like getting too excited Karlo.....not like its the X-factor...you know.....bursting into tears and crying out "this has changed my life for ever!"

Said on stellarium it was Amalthea not Io? Maybe mine is set wrong?

[michael.h.f.wilkinson]

Amalthea is very small. I doubt you would capture that. Io it should be

[Pentatonicblues]

Beautiful images, some of the best of the year I have seen. Not envious at all!! When do you chaps apply the drizzle step? Do you use the AS!2 drizzle- that created a mess when I tried it, or within Registax? Before or after wavelets? So many questions, sorry.

Stewart

[Space Cowboy]

Thanks Michael, must be a bug on my stellaruim....thought I was doing well capturing Amalthea lol

Cheers Stewart!

Yes its 1.5x drizzle in AS!2, simply select the drizzle before stacking and then use registax for wavelets. When you say a mess on your data do you mean alignment cracks on the stacked image? This can happen if too many alignment points are used. I use alignment box size 50 (auto alignment points) which gives me around 40-50 alignment points (depending on image size).

Don't worry about asking questions, there are no secrets.

[Pentatonicblues]

Cheers Stuart. I will try a reprocess of some data with those settings and see if I can avoid the crazy paving!

Stewart

[JamesF]

In my experience the "crazy paving" or fractured image tends to happen when there's a significant difference in contrast and/or brightness between stacked frames. When stacking hundreds or thousands of frames I've not worked out how to avoid that yet though.

James

[Space Cowboy]

Thats certainly the case with Registax James.

[JamesF]

I wonder if that's something PIPP could help with. It can already stretch the histogram by a fixed amount. Perhaps it would be possible to "normalise" them (after sorting into brightness order if required). I shall try to get my head around it and then perhaps talk to Chris.

James

[Space Cowboy]

AS!2 normalizes the stack and most of the time images are crack free.

[JamesF]

Yes, though I'm not totally happy with the performance of AS!2 on full disc white light solar images. It often seems to struggle with mine for reasons I've not been able to identify as yet.

James

[cgarry]

James,

PIPP's histogram stretch function does normalise the frames. If you select a histogram stretch of 80% all frames will be stretched (or compressed) so that each ones maximum pixel values are at 80% of maximum. The stretch is done (as are all operations on the processing tab) after sorting the the frames into brightness order, so that order of the frames will not be affected by the processing.

Cheers,

Chris

[JamesF]

Hmmm. Might have to look into what Registax is up to in a bit more depth, then. Thanks for the information, Chris.

James