PixInsight - Using GHS to Enhance Your Stretch

This video covers an alternative way to use the Generalised Hyperbolic Stretch (GHS) to enhance the standard stretch applied by SFT.
This is faster and allows the STF stretch to do most of the work, then GHS tweaks the stretch to bring out more of the detail or fainter parts of the image.
The GHS website: ghsastro.co.uk/
The GHS Repository address: www.ghsastro.co.uk/updates/

[@mickwhitaker4086]

Excellent demonstration, didn’t know you could use GHS after a STF stretch.

[@Astro_Shed]

I thought that GHS was used instead of the STF and not as well as, so opened my eyes…thanks 👍🏻

[@padraigfarrell7150]

Very intuitive,
Again, thanks for sharing

[@pcboreland1]

Excellent demonstration. Thanks for sharing your knowledge!

[@darle94]

Excellente vidéo comme d'habitude .Merci à toi pour le partage ..👋👋👋👍👍👍
Bien à toi et bon ciel.
Patrick

[@joedenisco6033]

Thank you sir.
That simplified the process quite a bit for me. I appreciate it!

[@danjensen9425]

Just started using it and nice to have more ways to use it.

[@andrewj1132]

Thanks for that. I must say I’ve only seen GHS applied to a linear image instead of STF and histogram transformation because the latter are seen as too aggressive. So, it’s interesting to see them applied sequentially like this ie STF then GHS. Personally I think I’ll stick to using GHS alone rather than STF when going from linear to nonlinear. But I did think it was interesting how you used GHS to stretch certain parts of the image. I will definitely try that in future. So thanks again. Andrew.

[@Maxastro59]

Thanks for sharing it. But I thought that GHS should be applied to linear image while you do it on non linear one.

[@lochaberastro9752]

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? 😀