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Thanks Scott, it'll be interesting to hear how you get on. 👍

Once the stars are separated, try using Curves with RGB/K. Fix the centre and experiment using an "S" curve, like I've done to bring out the nebula in this video. You should be able to reduce the fainter stars and give more emphasis to the more prominent ones.

@@lochaberastro9752 that kinda works but it’s not doing quite want we want. It’s working on intensity so it also reduces the intensity of the outer parts of the bright stars too. What’s required is a script which identifies the brightest stars and leaves them alone completely whilst attenuating the fainter stars according to some sliding scale.

@@andrewj1132 Have you had a look at Bill Blanshan's Star Reduction scripts for PI: th-cam.com/video/ofGt0Fk51h4/w-d-xo.html There are three versions to choose from and one of them may do what you're looking for. 😉

I leave PixInsight running on my PC, so it's not really an issue. But if you close the software regularly then I can see it would be a pain. A search of the PI Forum my supply an answer.

I'm glad the video was of benefit, Craig. I don't post my raw FIT files on here but you can download my process icons from here: www.lochaberwx.co.uk/Downloads/icons.xpsm

Merci Patrick, Il est bon de savoir que les vidéos sont utiles. Thank you Patrick, It is good to know the videos are useful.

Thanks for the feedback and it's good to hear that it was helpful. Regarding your question; I've put together a short video about the Process Icons - how to create, align & save them and the link is here: th-cam.com/video/-Bdpyxxt360/w-d-xo.html I hope that explains it as it makes life much easier.

Glad it was useful for you. As for the triangle & the box; The box will apply the command to the active image on the screen. The triangle is labelled "New Instance" and has a couple of jobs. 1. If you click & drag the triangle onto an open area of the screen, it will create a new instance of that process - a process button, which you can name as you want and use as a new process icon. 2. If you click & drag the triangle onto an image you're working on then it will apply the command to that image. Handy if you have several images open on the screen. 3. It can be used to transfer the settings from one process to another - like when you apply the STF stretch and transfer it to the Histogram. I hope that makes it a little clearer. 😁

Thanks for explaining that. That does help.

Technically you're correct in that the image is non-linear. But all I have done before applying GHS in this instance is to use STF to stretch the image. This is no different to applying the first iteration of GHS to a linear image. That first iteration of GHS to the linear image will make it non-linear, so any other iterations of GHS you apply will be to a non-linear image. I hope that makes sense? 😀

Glad it was useful. Some will get the halos around the stars, others won't, it seems to be random. The formula I use for recombining the stars into the image is: ~((~starless_image)*(~stars_image)) 😉

@@lochaberastro9752 GUI or CLI... I like 'em both. Does it matter which target is 1st? Off to study the characters in your example and learn a little more. Thanks again!

@@dlindsay1797 I've always put the background image first, then the stars. I've not tried it the other way around until tonight and you definitely want the background first! Give it a go and you'll see what I mean. 😃

@@lochaberastro9752 Agreed!

You can run SPCC first, the workflow is a personal thing and you need to work out what works best for you. The only reason I don't run SPCC first is so I can remove any gradients and neutralise the background beforehand. This means I don't risk calibrating colours which shouldn't be there or the gradients throw off the calibration.

Here's a tutorial on how to do stacking in PixInsight using WBPP: th-cam.com/video/9XgklwAICkM/w-d-xo.html

Hi Sarah, I generally use PixInsight for stacking. It takes longer than DSS, but I normally set it running overnight. I've made another video about the WBPP in PixInsight, if you're interested. 😉

@@lochaberastro9752 Thanks for this, just found your channel. Can I ask a follow on question about how you stacked this: did you just have data for the dual narrow band filter that you mentioned, or did you also combine with data for an IRCut or light pollution filter? if you combined data from different filters I would be interested to know how you did this in WBPP and any tips that you can give, thanks!

@@timburgess1528 The stack I used for this video was just the data from the Dual-Band filter, which is normal for me. You can combine it with a stack taken with just a UV/IR cut filter, but I would do this for the more natural looking star colours and then I would combine using PixelMath, rather then WBPP. You could remove the stars from the Dual-Band image using StarXT and replace them with the stars from the UV/IR stack using a simple "Dual-Band_background+UV/IR_Stars" formula in PixelMath. Making sure both images are aligned first of course.😉 I hope that helps.

@@lochaberastro9752 thank you!

Glad you found it useful. I went down the same route and tried the trail version of PI first. It made such a difference in what I could do with my images that I had to get the full version.

I've had another report of this and all I can suggest is to follow the instructions on the GHS Info page (ghsastro.co.uk/information/) about adding the GHS repository to PixInsight. I don't have direct contact with the authors, so I can't help further, unfortunately.

Thanks for the feedback. I recognised early on that the volume on this video needed to be increased and hopefully that's improved on more recent videos. With a bit of luck the mumbling will improve with future videos, this was only the second video I'd put together and I'm definitely not a professional at this type of thing. As it is, I may remake this one because, as well as the volume, the visual recording is of poorer quality, when compared to more recent ones and I've learnt a couple of other techniques to add in.

The icons can be found at the following link, but please remember that they include all the processes I use, so if you don't have some of them installed then you'll see an error when you load the icon set. Just accept the errors and PixInsight will eventually load the icons you have an you'll be able to save these for yourself. Here's the link: www.lochaberwx.co.uk/Downloads/icons.xpsm

Thanks alot@@lochaberastro9752

Bonjour Patrick, L'outil Binning que j'utilise s'appelle en fait "IntegerResample" et se trouve sous "Processus > Geometry". Merci pour votre intérêt et bonne chance avec vos images. Hi Patrick, The Binning tool I use is actually called "IntegerResample" and can be found under "Processes > Geometry". Thank you for your interest and good luck with your images.

Merci de ta réponse rapide. Oui ! Je l'ai trouvé comme tu me l'a indiqué. Je remercie de tes vidéos de formation PIX. Elles me sont d'une grande utilité. Merci encore de ton partage. Bien à toi et bon ciel. Patrick