PixInsight SHO Tutorial 2024 - Cutting-Edge Astrophotography Processing!

[@randyshivak8785]

Wow I learned a lot with all the new scripts!

[@willemwitteveen8374]

Thank you Sascha. I already used Image Blend.That is a big improvement.

[@robb7342]

Another great presentation, did not know about the Auto-Linear Fit. Perfect timing in my case as I've just started with mono and SHO.

[@richardchurch4137]

Great tutorial I will definitely be trying this out as I feel more comfortable using pixinsight & it has moved so quickly in a year that probably some of the things I am using are now outdated !

[@oakleywindowcleaning]

Amazing, Thankyou Sacha. I’ll be taking my first ZWOASI MM camera shortly so am trying to educate myself up from OSC processing. This vid is great, Thankyou. Matt

[@stuparker776]

Great thanks just started as a new patreon member and am interested in seeing your processing workflows.I picked up some good tips thanks

[@jeffginnow3561]

Another great video Sascha, thank you for helping to keep up with all the changes to this hobby. You continue to be the most bang for buck recipient of my modest Patreon investment of anyone I've ever supported.

[@russgenzmer8326]

Where do I find in your great tutorials how to print my images? Clear skies and wonderful tutorials

[@viewintospace]

Here: kzbin.info/www/bejne/kGjCcn-vr8afgNU

[@mupangamwanakatwe1300]

An excellent (as usual) tutorial that is logical and makes good use of if the new tools now available. 👍🏾 I guess that with great data, one can perhaps dispense with the use of LHE, unsharp mask. etc. I am currently imaging Eta Carina and Seagull, so will soon put the workflow to the test. Keep them coming …. Thanks 🙏🏿 and best regards! Mupanga, Lusaka, Zambia

[@victorbeer9515]

Great Tutorial Sascha. I love your great presentation and workflow. Will try this on my first SHO RGB image I recently captured with my zwo1600mm I have never used until a few nights ago on the Bubble. I captured SHO and RGB. I have seen others mention Synth Lum . Could you discuss where it might or might not fit into this workflow. It might be moot as I have been advised Lum filters are not necessary for the latest CMOS cameras. I will soon be upgrading to a QHY600 mm pro so am transitioning to NINA. Up until now I have been happy with my Takahashi FSQ-106 and zwo 2600MC using the ASI Air but now have the desire to delve into narrow band/RGB and allow for a wider range of equipment.. This was very straightforward and easy to follow. New patreon coming up. Regards, Vic

[@viewintospace]

Happy that it is helpful! About Lum: The short version - when it comes to nebula and narrowband - forget Lum. If you want to have the longer version and understand why, here is my video about Lum: kzbin.info/www/bejne/fF65hqaBe5yEaJo

[@freeflysi1707]

This really helped me a lot - Thank you so much

[@uanesdeiro]

Compliments!!! Great tutorial!!! I would love it if you made one for the LRGB technique Thank you

[@viewintospace]

I might - we‘ll see….-

[@iwolsiwols]

@@viewintospace i second that

[@Abstoss]

Yet another perfect tutorial, Sascha! I have lately been processing all my SHO pictures using this tutorial and I have been very happy with the results. Interestingly when I did it the first time dragging the SCT-Triangle onto HistogrammTransformation worked. But ever since it does not work anymore. If I drag the triangle from SCT onto HT the curve will not change and hence the stars will not be streched. I tried multiple things and cannot work it out. Anyone else with simular experience?

[@viewintospace]

I struggle sometimes with the same issue. BUT - this stretching practice is legacy, thanks to Seti Astro. Use his Star Stretch Script which produces great results!

[@Abstoss]

@viewintospace indeed. I use Star and statistical Stretch Most Times. Extremly handy Tools!

[@pereguerra7742]

Impressive tutorial, congratulations.

[@malcolqwe2]

love your tips, thanks

[@tristb9196]

Fantastic video. Thank you.

[@rtpman1953]

Great video Sascha. I did encounter one issue though. It involved stretching the stars. So I did exactly as you showed and yes the Histogram Transfer looked the same as yours. However when I dragged the triangle from the Histogram transfer to the stars image, the star diminished in brightness. How is the screen transfer getting set to the values of the stars image?

[@rtpman1953]

Never mind Sasha. I discovered what I was doing wrong.

[@Arcteek]

Such a good video thank you!

[@rayjohnson7437]

Hi Sascha - great tutorial. You used R, G, B filters in your SPCC section whereas the actural filters in this processing run were HSO. Could you let me know your thinking here, many thanks.

[@viewintospace]

Hi Ray This is the most asked question of this tutorial - seems to confuse everyone alike 🤣 Anyway, reason is that when you use these Pixelmath formulas, you try to generate RBG channels, so kind of like the stars were RGB stars and not narrowband anymore, so from that point also the filters would be then kind of RGB filters. It really does not matter which brand you chose as this is only an approximation, but you see in the curves that it work quite well like that.

[@RigoFromSpain]

Well done !!

[@jimcollins1922]

I have greatly appreciated this tutorial and the one on the DBXTRACT script and was wondering if you could offer an opinion. It turns out I have both the D1 filter and L-Ultimate filter along with the D2 filter. I am thinking of selling either the D1 or L-Ultimate as they are somewhat similar. I want to create SHO images as you demonstrated. Would you care to recommend which filter to keep? Would it be better to keep the matched pair of the D1 & D2 or use the L-Ultimate with the D2?

[@viewintospace]

Depends... 😁 On paper the L-Ultimate filter is the better one. But: 1. Optolong is known for the non-existent quality control. So have a look at exposures you took with the D1 and exposures you took with the Ultimate - where do you have less Halos? 2. Another consideration: If Halos are about equal and you do not live in an extremely light polluted region.... It will be much easier to sell the Ultimate than the D1..... simply as it is better known.....

[@iwolsiwols]

just superb thanks

[@craiglowery4427]

Wow. Very impressive workflow. I use a OSC with a dualband Ha and Oiii filter. Is there a way to create a synthetic Sii channel?

[@viewintospace]

Nope!!! You will find some tutorials which claim this is possible, but in reality you only create a fantasy layer, as it you did not catch the Sii, how should any process know how it looks like? Have a look at the Askar Colormagic D2 filter. It‘s not expensive and gives you the chance to shoot Sii - you find a few videos on my channel about the filter.

[@KartikAtre]

Hi Sascha, great video as usual. When I process stars as you instructed. STF-->Histogram Tx-->stars. Nothing happens. Is there anything I need to do to get this working?

[@viewintospace]

Have a look at Adams Video starting at about 8:30 - kzbin.info/www/bejne/rqLChWOrgbSLnJosi=SikjxOHbtAVnssyj

[@KartikAtre]

@@viewintospace Thanks Sascha. That was great help

[@victortellez7045]

Excellent tutorial Sascha! You made me remember some details that I was overlooking lately, and as always I learned new things, thank you very much!

[@lazylazyshark]

Thankyou for the tutorial Sacha. I followed all the steps using 3 SHO .fit files. Dynamic crop went ok, Gradient correction went ok, but with PixelMath, after following all the details of the process, when dragging the triangle on any image, it gives me an Error: No such image 0.4 * Ha + 0.6 * Sii. What could be the problem? (PI is version 1.8.9-3)

[@viewintospace]

1. Ensure all settings are really the same as in the video 2. Ensure the pictures are really named Ha and Sii (case sensitive)

[@lazylazyshark]

@@viewintospace perfect now, thank you! In fact the images were mislabeled...

[@ThePetrus112]

Truly quality content as all your videos! Having a question: I'm planning to shoot OSC with Askar D1 and D2 filters. Then use R from both images and combine 2 Gs and 2 Bs into synthetic B. Assuming I have 5h with D1 and 5h with D2 what will happen with noise? Will pixel math work similarly to single subframes? Moreover, if both filters pass o3 will the combination of their B and G channels increase definition in o3 structures?

[@viewintospace]

Have a look at this video: kzbin.info/www/bejne/nmnSYaZshauEr6c Use this script instead of Pixelmath, shoot about evenly with both filters and all will be fine.

[@michaelclem3339]

Do you have a Pixelmath equation to create RGB stars from OSC data using a dual band filter?

[@viewintospace]

No, I don’t and quite honestly with an OSC cam it’s so easy to shoot RGB stars that I would strongly recommend to go with the real stuff 😉

[@PhoenixAstroAndy]

Hello thanks for the video but wouldn't you use Narrowband filters mode in Spectrophotometric ColorCalibration as your masters were sho not rgb or does it not matter for just the stars?.

[@viewintospace]

Given we mix it all up with formulas it is neither - so use any RGB filters in SPCC and as you can see the result is quite good.

[@kskorobogatov]

Thanks for another nice video! The only part that left me scratching the head is how in SPCC you went on to select RGB filters even though the data was SHO. Is that a normal practice?

[@viewintospace]

With the formulas we made an attempt to bring the data back to RGB level and so to chose any RGB filters is closer by the reality we try to synthesize. As you can see with the curves, it works quite well. BTW, for SHO pics, SPCC can not be used at all.

[@alessandrogaldiero7796]

when will you make an updated tutorial also for color cameras 2024?

[@viewintospace]

I might do an RGB tutorial sometime, but in general when talking about this one here, you can use that also for OSC cameras. Either you use dual narrowband filters (like Askar D1&D2 filters) to capture the 3 emissions, or you only go with HOO and you adapt the few parts where it deviates. But 90% is the same no matter what data you have.

[@monteroder2708]

More great stuff..

[@MicheleHernandez-d2e]

For GHS mastery, I highly recommend Ryan and Dark Rangers Inc on KZbin who in my opinion really makes it easier. The one hour Adam Block video was very hard to get through for me. Then I watched the Dark Rangers one and I was able to really master it quickly in a much shorter time. Thanks for the video - really helpful to see the new scripts in action and a cool way to fix the stars. How would you compare that to the method inverting them and running SCNR? Would be interesting to compare.

[@viewintospace]

I would agree, Ryan has also a great video. While his is very intuitive, Adams was for me kind of an eyeopener and I learned a view new things. When it comes to the inverting and SCNR method, this is 💩 - it only removes the colors, so you basically end up with white stars. Some proposed using the Forexx script and that seems to give an equivalent result as these Pixelmath formulas.

[@MicheleHernandez-d2e]

@@viewintospaceI agree - for those who want to know EVERYTHING and the WHY everything works, his videos are great. I'm more of a "just tell me how to do it" and I don't need to know WHY for every single thing. Do you have a cut/paste link for the pixelmath formula for the stars? I'm not great at Pixel math...

[@viewintospace]

You find it in the dedicated video about this topic (just a few videos before this one) or you find it in the dedicated pdf to this workflow on my Patreon page (you can get a free trial)

[@nikaxstrophotography]

Foraxx script makes the best coloured stars no need for pixelmath

[@viewintospace]

It leads to about the same result given I would assume also the underlying formulas are about the same.

[@nikaxstrophotography]

@@viewintospace No they are different, you should give Foraxx a go

[@haiderbhogadia4829]

Why don’t you use autocrop on WBPP?

[@viewintospace]

Because I do not use WBPP 😏 I use APP to stack.

[@DarkMattersAstro]

@@viewintospace We have switched over from PI for pre-processing as well. APP is faster and more efficient, especially on Apple Silicon systems.

[@georgehatfield9473]

As usual, an excellent tutorial. You are the best! I use GHS a lot and have often had the background lighten too much after a GHS stretch. I quit GHS and use the Histogram Transformation tool to adjust the black point. Then return to GHS if needed. I find it easier to use HT than to do this in GHS.

[@jsn7123]

ja, es jahr gahd hüüt numeh füüf minute 😞