Removing Purple Star Halos - GIMP Astrophotography Tutorial

[@AstroOnBudget]

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[@Mrcloc]

I have also used this - I would suggest unpurpling a duplicate layer and blending them to keep a little of the purple so that you don't lose the true purple colour in the image.

[@AstroOnBudget]

Thats a very helpful tip! :) Cheers

[@revenger681]

I found your video after watching several others that wanted me to either use photoshop, or $300 pixinsight. Gimp ftw! Short and quick video, thank you!

[@UV-NIR-Thermal]

Thanks! I had an earlier version of GMIC so updated and worked great

[@AstroOnBudget]

Excellent! GMIC is so powerful!

[@mikemoran5439]

Thanks for this tutorial! All of my stretched images were turning very red/brown. Now I can color correct and ENHANCE!!!

[@jesuschrist2284]

At what point in your workflow would you use this? post stretch ?

[@jesuschrist2284]

Would this work on a star mask from starnet? Should i use it before or after stretching those stars?

[@simonmoore4939]

Thank you. I have just installed it and it works a treat. My achromat is back in action!

[@AstroOnBudget]

Great to hear! This little trick can work miracles with achromats :)

[@Bills_APCh]

Can this unpurple app work on a single star with a halo? I thought the colour of the background changed after. Any ideas what processing was done by the GMIC QT unpurple app?

[@AstroOnBudget]

Yeah absolutely. All you have do is just select the star and apply it.

[@melindamercier6811]

Incredibly easy, THANK YOU!

[@Cindy-mh5rb]

This works beautifully, thank you!!

[@AstroOnBudget]

Glad it helped!

[@andriidovbush6903]

Thanks for the advice! I'm looking forward to test it, when there will be next clear night)

[@AstroOnBudget]

Excellent! Clear nights are hard to come by:)

[@Bills_APCh]

@@AstroOnBudget They sure are and not so windy or dripping with dew! Or freezing the electron flow due to extreme low temps!

[@zahidahmed5680]

Sir..i saw your SV bony 70 ED review and have ordered one.... as per your review it's a good telescope ...so jumped for it..

[@AstroOnBudget]

Oh wonderful! How are you finding it so far?

[@zahidahmed5680]

Just used once.... really happy deciding to buy one..:)

[@zahidahmed5680]

I will try this technique...... good one as usual...👍

[@AstroOnBudget]

Thanks a lot 😊

[@rdiazmartin]

Thank you very much for this helpfull information

[@darrellburke3108]

Absolutely love your GIMP tutorials!. I'm sure you are very busy, but if I had a dream video request, it would combining images taken at different exposures - there seems to be so many uses for this in AP [foregrounds in Milky way images, revealing moons in planetary, toning down overblown cores etc]. I can sort of muddle through, but often also get tangled up and end up yelling in frustration at my poor innocent computer :)

[@AstroOnBudget]

Thank you Darrell! Very kind comment. I will make a vidoe on blending not too distant in the future. :)

[@MrYvano]

Excellent.

[@AstroOnBudget]

Thank you :)!

[@rafaelleafar020]

thanks for this tutorial. very helpful for me that I cant afford high specs scope. and my cheap scopes produces purple stars. I hope you can also make a video on how to crop an image (from widefield of view) that will not reduce or broke the quality of the image. thank you.

[@AstroOnBudget]

Thanks for your encouragement! Will do! Btw, you can use cheap UHC filter to reduce Chromatic Aberration.

[@nevadaxtube]

Does this work for Lightroom or Photoshop?

[@AstroOnBudget]

Camera Raw has similar function. I think it's under "Lens correction". So yes, this works for LR and PS too.

[@avt_astro206]

Great Tutorial as Always! G'MIC is A Pretty good Tool for Basic Astronomers Like me 😄🤙

[@AstroOnBudget]

G'mic is awesome :)! Hope you have had some clear skies :)

[@DrJ_MKE]

Thanks Jeremiah - nice tutorial for this plug-in. I think it is a really cool filter feature for GIMP that I could definitely use. Unfortunately, I use a Mac, and it appeats that there is no simple download as they don't have an OSX version... while it appears there are some workarounds, that is not in my wheelhouse at this point. 😞

[@AstroOnBudget]

Oh man! That sucks. I think you can use Camera Raw in PS to do the same thing. It's under Lens Correction I think. Btw, great to hear from you. How are you going?

[@jpastroguy]

WOW!

[@AstroOnBudget]

Cheers :)! Love your channel.